Presently there are three peripherals that gets it timing
by runtime calculation. Those peripherals can work with
frequency scaling that affects gpmc clock. But timing
calculation for them are in different ways.
Here a generic runtime calculation method is proposed. Input
to this function were selected so that they represent timing
variables that are present in peripheral datasheets. Motive
behind this was to achieve DT bindings for the inputs as is.
Even though a few of the tusb6010 timings could not be made
directly related to timings normally found on peripherals,
expressions used were translated to those that could be
justified.
There are possibilities of improving the calculations, like
calculating timing for read & write operations in a more
similar way. Expressions derived here were tested for async
onenand on omap3evm (as vanilla Kernel does not have omap3evm
onenand support, local patch was used). Other peripherals,
tusb6010, smc91x calculations were validated by simulating
on omap3evm.
Regarding "we_on" for onenand async, it was found that even
for muxed address/data, it need not be greater than
"adv_wr_off", but rather could be derived from write setup
time for peripheral from start of access time, hence would
more be in line with peripheral timings. With this method
it was working fine. If it is required in some cases to
have "we_on" same as "wr_data_mux_bus" (i.e. greater than
"adv_wr_off"), another variable could be added to indicate
it. But such a requirement is not expected though.
It has been observed that "adv_rd_off" & "adv_wr_off" are
currently calculated by adding an offset over "oe_on" and
"we_on" respectively in the case of smc91x. But peripheral
datasheet does not specify so and so "adv_rd(wr)_off" has
been derived (to be specific, made ignorant of "oe_on" and
"we_on") observing datasheet rather than adding an offset.
Hence this generic routine is expected to work for smc91x
(91C96 RX51 board). This was verified on smsc911x (9220 on
OMAP3EVM) - a similar ethernet controller.
Timings are calculated in ps to prevent rounding errors and
converted to ns at final stage so that these values can be
directly fed to gpmc_cs_set_timings(). gpmc_cs_set_timings()
would be modified to take ps once all custom timing routines
are replaced by the generic routine, at the same time
generic timing routine would be modified to provide timings
in ps. struct gpmc_timings field types are upgraded from
u16 => u32 so that it can hold ps values.
Whole of this exercise is being done to achieve driver and
DT conversion. If timings could not be calculated in a
peripheral agnostic way, either gpmc driver would have to
be peripheral gnostic or a wrapper arrangement over gpmc
driver would be required.
Signed-off-by: Afzal Mohammed <afzal@ti.com>
Configure busturnaround, cycle2cycledelay, waitmonitoringtime,
clkactivationtime in gpmc_cs_set_timings(). This is done so
that boards can configure these parameters of gpmc in Kernel
instead of relying on bootloader. Also configure bool type
timings like extradelay.
This needed change to the existing users that were configuring
clk activation time and extra delay by directly writing to
registers. Thanks to Tony for making me aware of users of clk
activation and being kind enough to test the modified one.
Signed-off-by: Afzal Mohammed <afzal@ti.com>
gpmc_cs_set_timings() calculate ticks to be programmed by
rounding time in ns to next tick value. Hence remove
redundant rounding of nanosecond timing.
Signed-off-by: Afzal Mohammed <afzal@ti.com>
The only thing omap_init_consistent_dma_size() does is increase the
consistent DMA size if CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE is defined.
Increasing the consistent DMA size should no longer be needed with CMA
in place.
This patch removes omap_init_consistent_dma_size() and also
arch/arm/mach-omap2/io.c:omap_common_init_early() which becomes an empty
function.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
[tony@atomide.com: updated for moved dma.h]
Signed-off-by: Tony Lindgren <tony@atomide.com>
Omap no longer needs this option, mach/gpio.h is
empty.
Also remove mach/irqs.h from gpio-omap.h and
include it directly from the related omap1
gpio init files.
Otherwise omap2+ build fails for MULTI_PLATFORM.
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Jarkko Nikula <jarkko.nikula@bitmer.com>
Cc: Liam Girdwood <lrg@ti.com>
Cc: alsa-devel@alsa-project.org
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Now mach/hardware.h is empty for omap2+ and can be
removed except for plat-omap/dmtimer.c for omap1.
Also the include of mach/irqs.h can now be removed
for shared plat-omap/i2c.c as it's no longer needed.
Signed-off-by: Tony Lindgren <tony@atomide.com>
As discussed on linux-arm-kernel, we want to avoid
relative includes for the arch/arm/*omap* code:
http://www.spinics.net/lists/linux-omap/msg80520.html
Fix serial.h by moving it to mach/serial.h.
Signed-off-by: Tony Lindgren <tony@atomide.com>
As discussed on linux-arm-kernel, we want to avoid
relative includes for the arch/arm/*omap* code:
http://www.spinics.net/lists/linux-omap/msg80520.html
Fix includes for fpga.h by making fpga.h local
to mach-omap1. The common code in plat-omap just
needs to know the struct h2p2_dbg_fpga, which can
be local to debug-leds.c.
This also fixes the braindead <../*.h> style includes
that got accidentally added with search and replace
during the cleanup.
Signed-off-by: Tony Lindgren <tony@atomide.com>
As discussed on linux-arm-kernel, we want to avoid
relative includes for the arch/arm/*omap* code:
http://www.spinics.net/lists/linux-omap/msg80520.html
Note that eventually when the omap1 specific drivers
are fixed to not use cpu_is_omap macros and not depend
on mach/hardware.h, this patch can be reverted and these
headers can be local. But since just fixing the drivers for
omap2+ is already a big enough hassle, let's deal
with that properly first.
[tony@atomide.com: also drop unused include for ispvideo.c]
Signed-off-by: Tony Lindgren <tony@atomide.com>
This code will be eventually in drivers, and for the
code in the drivers we don't want to have any cpu_is_omap
usage. Those macros should be private to arch/arm/mach-omap1
and arch/arm/mach-omap2.
To fix this, let's move the define for dma_omap2plus()
to dma-omap.h, and use the existing dma_attr passed in
the platform_data as the revision registers are what they
are.
Note that we can now also remove the relative includes
introduced by the recent clean-up patches.
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
As discussed on linux-arm-kernel, we want to avoid
relative includes for the arch/arm/*omap* shared code:
http://www.spinics.net/lists/linux-omap/msg80520.html
Let's add plat/debug-devices.h for debug_card_init()
to fix the relative includes.
Note that drivers must not use this header as it will
break build for omap2+ CONFIG_MULTIPLATFORM builds.
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Most of the prototypes in plat-omap/common.h are not
common to omap1 and omap2+, they are local to omap2+
and should not be in plat-omap/common.h.
The only shared function prototype in this file is
omap_init_clocksource_32k(), let's put that into
counter-32k.h.
Note that the new plat/counter-32k.h must not be
included from drivers, that will break omap2+ build
for CONFIG_MULTIPLATFORM.
Signed-off-by: Tony Lindgren <tony@atomide.com>
This code should be private to mach-omap2.
The only use for it in for omap1 has been in dmtimer.c
to check for context loss. However, omap1 does not
lose context during idle, so the code is not needed.
Further, omap1 timer has OMAP_TIMER_ALWON set, so omap1
was not hitting omap_pm_get_dev_context_loss_count()
test.
Cc: Jon Hunter <jon-hunter@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
As discussed on linux-arm-kernel, we want to avoid
relative includes for the arch/arm/*omap* shared code:
http://www.spinics.net/lists/linux-omap/msg80520.html
To fix this for the shared i2c.h, let's re-introduce
a minimal plat/i2c.h.
Note that drivers must not use this header as it will
break build for omap2+ CONFIG_MULTIPLATFORM builds.
Signed-off-by: Tony Lindgren <tony@atomide.com>
The common code should not have any omap1 or omap2+
specific code, and should not need to call the cpu_is_omap
macros.
The only remaining user for cpu_is_omap macros is
omap_i2c_nr_ports(). Let's make those checks in
the omap specific implementation of omap_i2c_add_bus()
instead in order to remove cpu_is_omap usage from
the common code.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Let's make the omap2+ specific parts private to mach-omap2.
This leaves just a minimal shared code into plat-omap like
it should be.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Most of the defines are specific to omap1 and omap2+,
and should be in the local headers. Only minimal function
prototypes need to be shared.
As discussed on linux-arm-kernel, we want to avoid
relative includes for the arch/arm/*omap* shared code:
http://www.spinics.net/lists/linux-omap/msg80520.html
So this patch re-adds a minimal plat/sram.h.
The new plat/sram.h must not be included from drivers,
that will break build for omap2+ CONFIG_MULTIPLATFORM.
Note that this patch temporarily adds two more
relative includes; Those will be removed in the
following patch.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Resolve the following sparse warnings:
arch/arm/mach-omap1/usb.c:304:12: warning: symbol 'omap1_usb0_init' was not declared. Should it be static?
arch/arm/mach-omap1/usb.c:412:12: warning: symbol 'omap1_usb1_init' was not declared. Should it be static?
arch/arm/mach-omap1/usb.c:478:12: warning: symbol 'omap1_usb2_init' was not declared. Should it be static?
by declaring those functions as static.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Felipe Balbi <balbi@ti.com>
[tony@atomide.com: this was missed with plat/usb.h removal]
Signed-off-by: Tony Lindgren <tony@atomide.com>
OMAP cleanup-headers branch. Intended for 3.8 cleanup.
Basic build, boot, and PM test logs are available from here:
http://www.pwsan.com/omap/testlogs/cleanup-headers-compile-fixes-3.8/20121026132711/
Due to underlying problems in v3.7-rc2, several tests fail. These
failures are unrelated to these patches.
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Merge tag 'omap-cleanup-fixes-a-for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending into omap-for-v3.8/cleanup-headers
Several fixes for build failures and sparse warnings in the
OMAP cleanup-headers branch. Intended for 3.8 cleanup.
Basic build, boot, and PM test logs are available from here:
http://www.pwsan.com/omap/testlogs/cleanup-headers-compile-fixes-3.8/20121026132711/
Due to underlying problems in v3.7-rc2, several tests fail. These
failures are unrelated to these patches.
Commit 4c98dc6b8e ("ARM: OMAP: Make
plat/fpga.h local to arch/arm/plat-omap") results in a new warning from
sparse:
arch/arm/mach-omap1/fpga.c:147:6: warning: symbol 'omap1510_fpga_init_irq' was not declared. Should it be static?
Fix by adding a missing include.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Tony Lindgren <tony@atomide.com>
Commit 25c7d49ed4 ("ARM: OMAP: Make
omap_device local to mach-omap2") broke an OMAP5912-only build here:
arch/arm/mach-omap1/pm_bus.c: In function 'omap1_pm_runtime_init':
arch/arm/mach-omap1/pm_bus.c:69:2: error: implicit declaration of function
'cpu_class_is_omap1'
make[1]: *** [arch/arm/mach-omap1/pm_bus.o] Error 1
Fix by adding a missing include.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Tony Lindgren <tony@atomide.com>
Commit b7754452b3 ("mtd: onenand: omap:
use pdata info instead of cpu_is") broke an OMAP3+4 build and an N800
multi-OMAP2xxx build here:
drivers/built-in.o: In function `omap2_onenand_probe':
drivers/mtd/onenand/omap2.c:742: undefined reference to `omap2_onenand_read_bufferram'
drivers/mtd/onenand/omap2.c:743: undefined reference to `omap2_onenand_write_bufferram'
drivers/mtd/onenand/omap2.c:742: undefined reference to `omap2_onenand_read_bufferram'
drivers/mtd/onenand/omap2.c:743: undefined reference to `omap2_onenand_write_bufferram'
...
drivers/built-in.o: In function `omap2_onenand_probe':
drivers/mtd/onenand/omap2.c:788: undefined reference to `omap3_onenand_read_bufferram'
drivers/mtd/onenand/omap2.c:788: undefined reference to `omap3_onenand_write_bufferram'
Fix by declaring static functions for the missing symbols, rather than
just prototypes.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Afzal Mohammed <afzal@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
In order to make single zImage work for ARM architecture,
we need to make sure we don't depend on private headers.
Move USB platform_data to <linux/platform_data/omap-usb.h>
and add a minimal drivers/mfd/usb-omap.h.
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Partha Basak <parthab@india.ti.com>
Cc: Keshava Munegowda <keshava_mgowda@ti.com>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Felipe Balbi <balbi@ti.com>
[tony@atomide.com: updated for local mfd/usb-omap.h]
Signed-off-by: Tony Lindgren <tony@atomide.com>
Let's move what we can from plat/usb.h to the local usb.h
for ARM common zImage support.
This is needed so we can remove plat/usb.h for ARM common
zImage support.
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Partha Basak <parthab@india.ti.com>
Cc: Keshava Munegowda <keshava_mgowda@ti.com>
Cc: linux-usb@vger.kernel.org
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
For omap1, we'll keep mach/serial.h around for 8250.c hardware
workarounds. For omap2+, we no longer need mach/serial.h and
can make it local to mach-omap2.
Signed-off-by: Tony Lindgren <tony@atomide.com>
This allows us to eventually move omap2+ to generic
debug code that's configured in Kconfig for the port.
Signed-off-by: Tony Lindgren <tony@atomide.com>
window to remove most of the remaining plat includes to get us
closer to ARM common zImage support.
To avoid a huge amount of trivial merge conflicts with includes,
this branch is based on several small topic branches coordinated
with the driver subsystem maintainers. These branches are based on
v3.7-rc1 and can also be merged into the related driver subsystem
branches as needed:
omap-for-v3.8/cleanup-headers-prepare few trivial driver changes
omap-for-v3.8/cleanup-headers-dma move of the DMA header
omap-for-v3.8/cleanup-headers-gpmc GPMC and MTD changes
omap-for-v3.8/cleanup-headers-mmc MMC related changes
omap-for-v3.8/cleanup-headers-dss DSS related changes
omap-for-v3.8/cleanup-headers-asoc ASoC related changes
Note that for the dma-omap.h, it was decided that it should be
is completed. For the related discussion, please see:
https://patchwork.kernel.org/patch/1519591/#
After these patches we still have a few plat headers remaining
that will be handled in later pull requests.
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Merge tag 'omap-for-v3.8/cleanup-headers-signed' into omap-for-v3.8/cleanup-headers-serial-take2
This is the first set of omap cleanup patches for v3.8 merge
window to remove most of the remaining plat includes to get us
closer to ARM common zImage support.
To avoid a huge amount of trivial merge conflicts with includes,
this branch is based on several small topic branches coordinated
with the driver subsystem maintainers. These branches are based on
v3.7-rc1 and can also be merged into the related driver subsystem
branches as needed:
omap-for-v3.8/cleanup-headers-prepare few trivial driver changes
omap-for-v3.8/cleanup-headers-dma move of the DMA header
omap-for-v3.8/cleanup-headers-gpmc GPMC and MTD changes
omap-for-v3.8/cleanup-headers-mmc MMC related changes
omap-for-v3.8/cleanup-headers-dss DSS related changes
omap-for-v3.8/cleanup-headers-asoc ASoC related changes
Note that for the dma-omap.h, it was decided that it should be
is completed. For the related discussion, please see:
https://patchwork.kernel.org/patch/1519591/#
After these patches we still have a few plat headers remaining
that will be handled in later pull requests.
This allows us to get rid of the ifdefs in 8250.c.
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Modify divisor to select the nearest baud rate divider rather than the
lowest. It minimizes baud rate errors especially on low UART clock
frequencies.
For example, if uartclk is 33000000 and baud is 115200 the ratio is
about 17.9 The current code selects 17 (5% error) but should select 18
(0.5% error).
This 5% error in baud rate leads to garbage on receiving end, while 0.5%
doesn't.
The issue showed up when using the stock 8250 driver for
Synopsys DW UART. This was on a FPGA with ~12MHz UART clock.
When we enabled early serial, we saw garbage which was narrowed down
to the rounding error.
So the bug had been latent and it only showed up with such low clock rates.
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Convert clk_enable/clk_disable to clk_prepare_enable/clk_disable_unprepare
calls as required by common clock framework.
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
When a driver has the low_latency flag set and uses the schedule_flip()
function to initiate copying data to the line discipline, a workqueue is
scheduled in but never actually flushed. This is incorrect use of the
low_latency flag (driver should not support the low_latency flag, or use
the tty_flip_buffer_push() function instead). Make sure a warning is
reported to catch incorrect use of the low_latency flag.
This patch goes with: cee4ad1ed9
Signed-off-by: Ivo Sieben <meltedpianoman@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Instead of BUG_ON(in_interrupt()), since that doesn't check for all
the newfangled stuff like preempt.
Note that this is valid since the console_sem is essentially used like
a real mutex with only two twists:
- we allow trylock from hardirq context
- across suspend/resume we lock the logical console_lock, but drop the
semaphore protecting the locking state.
Now that doesn't guarantee that no one is playing tricks in
single-thread atomic contexts at suspend/resume/boot time, but
- I couldn't find anything suspicious with some grepping,
- might_sleep shouldn't die,
- and I think the upside of catching more potential issues is worth
the risk of getting a might_sleep backtrace that would have been
save (and then dealing with that fallout).
Cc: Dave Airlie <airlied@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
So this is it. The big step why we did all the work over the past
kernel releases. Now everything is prepared, so nothing protects us
from doing that big step.
| | \ \ nnnn/^l | |
| | \ / / | |
| '-,.__ => \/ ,-` => | '-,.__
| O __.´´) ( .` | O __.´´)
~~~ ~~ `` ~~~ ~~
The buffers are now in the tty_port structure and we can start
teaching the buffer helpers (insert char/string, flip etc.) to use
tty_port instead of tty_struct all around.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
For that purpose we have to temporarily introduce a second tty back
pointer into tty_port. It is because serial layer, and maybe others,
still do not use tty_port_tty_set/get. So that we cannot set the
tty_port->tty to NULL at will now.
Yes, the fix would be to convert whole serial layer and all its users
to tty_port_tty_set/get. However we are in the process of removing the
need of tty in most of the call sites, so this would lead to a
duplicated work.
Instead we have now tty_port->itty (internal tty) which will be used
only in flush_to_ldisc. For that one it is ensured that itty is valid
wherever the work is run. IOW, the work is synchronously cancelled
before we set itty to NULL and also before hangup is processed.
After we need only tty_port and not tty_struct in most code, this
shall be changed to tty_port_tty_set/get and itty removed completely.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
During the move of tty buffers from tty_struct to tty_port, we will
need to switch all users of buf to tty->port->buf. There are many
functions where this is accessed directly in their code many times.
Cache the tty->buf pointer in such functions now and change only
single lines in each function in the next patch.
Not that it is convenient for the next patch, but the code is now also
more readable.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
They are only TTY buffers specific. And the buffers will go to
tty_port in the next patches. So to remove the need to have both
tty_port and tty_struct at some places, let us move the flags to
tty_port.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
In some funtions we need only n_tty_data, so pass it down directly in
case tty is not needed there.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
atomic_write_lock is not n_tty specific, so move it up in the
tty_struct.
And since these are the last ones to move, remove also the comment
saying there are some ldisc' members. There are none now.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
All the ring-buffers...
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Here we move bitmaps and use DECLARE_BITMAP to declare them in the new
structure. And instead of memset, we use bitmap_zero as it is more
appropriate.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Here we start moving all the n_tty related bits from tty_struct to
the newly defined n_tty_data struct in n_tty proper.
In this patch primitive members and bits are moved. The rest will be
done per-partes in the next patches.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
All n_tty related members from tty_struct will be moved here.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is a private member of n_tty. Stop accessing it. Instead, take is
as an argument.
This is needed to allow clean switch of the private members to a
separate private structure of n_tty.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* BUG_ON(!tty) in n_tty_set_termios -- it cannot be called with tty ==
NULL. It is called from two call sites. First, from n_tty_open where
we have a valid tty. Second, as ld->ops->set_termios from
tty_set_termios. But there we have a valid tty too.
* if (!tty) in n_tty_open -- why would the TTY layer call ldisc's
open with an invalid TTY? No it indeed does not. All call sites have
a tty and dereference that.
* BUG_ON(!tty->read_buf) in n_tty_read -- this used to be a valid
check. The ldisc handling was broken some time ago when I added the
check to ensure everything is OK. It still can catch the case, but
no later than we move the buffer to ldisc data. Then there will be
no read_buf in tty_struct, i.e. nothing to check for.
* if (!tty->read_buf) in n_tty_receive_buf -- this should never
happen. All callers of ldisc->ops->receive_ops should hold a
reference to an ldisc and close (which frees read_buf) cannot be
called until the reference is dropped.
* if (WARN_ON(!tty->read_buf)) in n_tty_read -- the same as in the
previous case.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
ldisc->open and close are called only once and cannot cross. So the
tests in open and close are superfluous. Remove them. (But leave sets
to NULL to ensure there is not a bug somewhere.)
And when the tests are gone, handle properly failures in open. We
leaked read_buf if allocation of echo_buf failed before. Now this is
not the case anymore.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Afzal Mohammed