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Paul Fulghum ffd7d6baa6 synclink_gt: fix per device locking 
Fix a long standing bug with per device locking.

Each device has an associated spinlock for synchronizing access to
hardware and state information with the ISR.  A single hardware card has
one or more devices.

Bug: Non ISR code correctly acquires and releases the per device lock.
ISR incorrectly always acquires and releases the lock of the first device
on the card.

The decoupled and list based nature of the ISR and deferred processing
interaction allowed this to work in normal operation.  Exceptional events
like an application forcing hardware shutdown, reset, or reconfiguration
while active can trigger the bug.

Fixed ISR to acquire and release the per device lock.

One exception is manipulation of the GPIO card resource which is global
and effectively owned by the first device of the card.  Non-ISR access to
GPIO resource is changed to use lock of first device on card.

Signed-off-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2010-10-27 18:03:14 -07:00
..
agp Merge branch 'drm-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2010-10-26 18:57:59 -07:00
hw_random llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
ip2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6 2010-10-22 19:59:04 -07:00
ipmi ipmi: fix __init and __exit attribute locations 2010-10-27 18:03:13 -07:00
mwave Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
pcmcia Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
rio Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
tpm Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
xilinx_hwicap Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
.gitignore
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Kconfig add ttyprintk driver 2010-10-22 10:20:02 -07:00
Makefile add ttyprintk driver 2010-10-22 10:20:02 -07:00
amiserial.c tty: icount changeover for other main devices 2010-10-22 10:20:05 -07:00
apm-emulation.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
applicom.c drivers: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:04 +02:00
applicom.h
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bfin-otp.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
bfin_jtag_comm.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
briq_panel.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
bsr.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
cd1865.h
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consolemap.c
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cp437.uni
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cs5535_gpio.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
cyclades.c tty: icount changeover for other main devices 2010-10-22 10:20:05 -07:00
defkeymap.c_shipped
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defkeymap.map
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digi1.h
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digiFep1.h
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digiPCI.h
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ds1302.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
ds1620.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
dsp56k.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
dtlk.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
efirtc.c efirtc: explicitly set llseek to no_llseek 2009-12-16 07:19:59 -08:00
epca.c epca: Kill the big kernel lock 2010-08-10 13:47:40 -07:00
epca.h
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epcaconfig.h
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generic_nvram.c drivers: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:04 +02:00
generic_serial.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
genrtc.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
hangcheck-timer.c Input: sysrq - drop tty argument form handle_sysrq() 2010-08-21 00:34:45 -07:00
hpet.c drivers/char/hpet.c: fix information leak to userland 2010-10-26 16:52:11 -07:00
hvc_beat.c Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-02-25 15:38:37 -08:00
hvc_console.c drivers/char/hvc_console.c: remove unneeded __set_current_state(TASK_RUNNING) 2010-10-27 18:03:14 -07:00
hvc_console.h hvc_console: make the ops pointer const. 2010-02-24 14:22:32 +10:30
hvc_irq.c
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hvc_iseries.c Merge branch 'for-next' into for-linus 2010-03-08 16:55:37 +01:00
hvc_iucv.c [S390] hvc_iucv: do not call iucv_unregister if iucv_register failed 2010-10-25 16:10:17 +02:00
hvc_rtas.c hvc_console: make the ops pointer const. 2010-02-24 14:22:32 +10:30
hvc_tile.c char: hvc: check for error case 2010-10-14 14:48:12 -04:00
hvc_udbg.c hvc_console: make the ops pointer const. 2010-02-24 14:22:32 +10:30
hvc_vio.c hvc_console: make the ops pointer const. 2010-02-24 14:22:32 +10:30
hvc_xen.c xen/hvc: only notify if we actually sent something 2010-10-22 12:57:33 -07:00
hvcs.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
hvsi.c Input: sysrq - drop tty argument form handle_sysrq() 2010-08-21 00:34:45 -07:00
i8k.c drivers: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:04 +02:00
isicom.c isicom: kill off the BKL 2010-08-10 13:47:40 -07:00
istallion.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
keyboard.c Input: add support for large scancodes 2010-09-09 22:00:50 -07:00
lp.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
mbcs.c drivers: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:04 +02:00
mbcs.h
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mem.c vfs: introduce FMODE_UNSIGNED_OFFSET for allowing negative f_pos 2010-10-25 21:18:21 -04:00
misc.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
mmtimer.c SGI Altix IA64 mmtimer: eliminate long interval timer holdoffs 2010-10-27 18:03:14 -07:00
moxa.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
moxa.h
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mspec.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
mxser.c tty: icount changeover for other main devices 2010-10-22 10:20:05 -07:00
mxser.h
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n_gsm.c drivers/char/n_gsm.c: add missing spin_unlock_irqrestore 2010-08-11 08:59:20 -07:00
n_hdlc.c tty: replace BKL with a new tty_lock 2010-08-10 13:47:43 -07:00
n_r3964.c Update broken web addresses in the kernel. 2010-10-18 11:03:14 +02:00
n_tty.c tty: Add EXTPROC support for LINEMODE 2010-08-10 13:47:39 -07:00
nozomi.c tty: icount changeover for other main devices 2010-10-22 10:20:05 -07:00
nsc_gpio.c
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nvram.c drivers: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:04 +02:00
nwbutton.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
nwbutton.h
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nwflash.c drivers: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:04 +02:00
pc8736x_gpio.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
ppdev.c drivers: autoconvert trivial BKL users to private mutex 2010-10-05 15:01:04 +02:00
ps3flash.c drop unused dentry argument to ->fsync 2010-05-27 22:05:02 -04:00
pty.c tty: Remove __GFP_NOFAIL from tty_add_file() 2010-10-22 10:19:58 -07:00
ramoops.c char drivers: RAM oops/panic logger 2010-05-27 09:12:50 -07:00
random.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
raw.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
riscom8.c riscom8: kill use of lock_kernel 2010-08-10 13:47:40 -07:00
riscom8.h
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riscom8_reg.h
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rocket.c drivers/char/rocket.c: release_region or error path 2010-10-27 18:03:14 -07:00
rocket.h
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rocket_int.h
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rtc.c of/device: Replace struct of_device with struct platform_device 2010-08-06 09:25:50 -06:00
scc.h m68k: atari - Rename "mfp" to "st_mfp" 2009-02-22 09:23:02 -08:00
scx200_gpio.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
selection.c tty: remove tty_lock_nested 2010-08-10 13:47:44 -07:00
ser_a2232.c headers: remove sched.h from interrupt.h 2009-10-11 11:20:58 -07:00
ser_a2232.h
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ser_a2232fw.ax
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ser_a2232fw.h
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serial167.c tty: release BTM while sleeping in block_til_ready 2010-08-10 13:47:44 -07:00
snsc.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
snsc.h
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snsc_event.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
sonypi.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
specialix.c tty: release BTM while sleeping in block_til_ready 2010-08-10 13:47:44 -07:00
specialix_io8.h
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stallion.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
sx.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
sx.h
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sxboards.h
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sxwindow.h
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synclink.c tty: icount changeover for other main devices 2010-10-22 10:20:05 -07:00
synclink_gt.c synclink_gt: fix per device locking 2010-10-27 18:03:14 -07:00
synclinkmp.c tty: icount changeover for other main devices 2010-10-22 10:20:05 -07:00
sysrq.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-10-25 07:59:01 -07:00
tb0219.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
tlclk.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
toshiba.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
tty_audit.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
tty_buffer.c tty: fix obsolete comment on tty_insert_flip_string_fixed_flag 2010-05-21 09:34:30 -07:00
tty_io.c tty: Make tiocgicount a handler 2010-10-22 10:20:04 -07:00
tty_ioctl.c tty: Add EXTPROC support for LINEMODE 2010-08-10 13:47:39 -07:00
tty_ldisc.c tty: remove tty_lock_nested 2010-08-10 13:47:44 -07:00
tty_mutex.c tty: implement BTM as mutex instead of BKL 2010-08-10 13:47:44 -07:00
tty_port.c tty: release BTM while sleeping in block_til_ready 2010-08-10 13:47:44 -07:00
ttyprintk.c add ttyprintk driver 2010-10-22 10:20:02 -07:00
uv_mmtimer.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
vc_screen.c vcs: invoke the vt update callback when /dev/vcs* is written to 2010-10-22 10:20:06 -07:00
viotape.c Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl 2010-10-22 10:52:56 -07:00
virtio_console.c virtio: console: Disable lseek(2) for port file operations 2010-10-21 17:44:04 +10:30
vme_scc.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
vt.c vcs: invoke the vt update callback when /dev/vcs* is written to 2010-10-22 10:20:06 -07:00
vt_ioctl.c drivers/char/vt_ioctl.c: fix VT_OPENQRY error value 2010-10-27 18:03:05 -07:00