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OpenCloudOS-Kernel
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Ira Snyder f04cd40701 fsldma: fix controller lockups 
Enabling poisoning in the dmapool API quickly showed that the DMA
controller was fetching descriptors that should not have been in use.
This has caused intermittent controller lockups during testing.

I have been unable to figure out the exact set of conditions which cause
this to happen. However, I believe it is related to the driver using the
hardware registers to track whether the controller is busy or not. The
code can incorrectly decide that the hardware is idle due to lag between
register writes and the hardware actually becoming busy.

To fix this, the driver has been reworked to explicitly track the state
of the hardware, rather than try to guess what it is doing based on the
register values.

This has passed dmatest with 10 threads per channel, 100000 iterations
per thread several times without error. Previously, this would fail
within a few seconds.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
 		2011-03-11 17:52:36 -08:00
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accessibility
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acpi ACPI / PM: Call suspend_nvs_free() earlier during resume 2011-01-20 18:30:17 -08:00
amba
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ata kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
atm Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-01-13 10:05:56 -08:00
auxdisplay
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base kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
block Merge branch 'for-2.6.38/drivers' of git://git.kernel.dk/linux-2.6-block 2011-01-13 10:50:24 -08:00
bluetooth
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cdrom Merge branch 'for-2.6.38/core' of git://git.kernel.dk/linux-2.6-block 2011-01-13 10:45:01 -08:00
char Merge branch 'akpm' 2011-01-20 17:02:14 -08:00
clk
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clocksource
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connector
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cpufreq kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
cpuidle Merge branch 'cpuidle-perf-events' into idle-test 2011-01-12 18:06:19 -05:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2011-01-13 10:25:58 -08:00
dca dca: remove unneeded NULL check 2011-01-13 08:03:09 -08:00
dio
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dma fsldma: fix controller lockups 2011-03-11 17:52:36 -08:00
edac Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-01-13 10:05:56 -08:00
eisa
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firewire Merge branches 'fixes' and 'fwnet' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2011-01-21 13:34:39 -08:00
firmware kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
gpio Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6 2011-01-14 09:08:00 -08:00
gpu Merge branch 'akpm' 2011-01-20 17:02:14 -08:00
hid kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
hwmon hwmon: (lm93) Add support for LM94 2011-01-18 12:22:54 -08:00
i2c i2c: Encourage move to dev_pm_ops by warning on use of legacy methods 2011-01-14 22:03:50 +01:00
ide kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
idle Merge branch 'cpuidle-perf-events' into idle-test 2011-01-12 18:06:19 -05:00
ieee802154
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infiniband kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
input kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
isdn Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-01-13 10:05:56 -08:00
leds drivers/leds/ledtrig-gpio.c: make output match input, tighten input checking 2011-01-20 17:02:06 -08:00
lguest lguest: compile fixes 2011-01-20 21:37:29 +10:30
macintosh powerpc/macintosh: Fix wrong test in fan_{read,write}_reg() 2011-01-21 14:08:34 +11:00
mca
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md block: restore multiple bd_link_disk_holder() support 2011-01-14 18:44:22 +01:00
media Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2011-01-21 16:50:31 -08:00
memstick memstick: factor out transfer initiating functionality in mspro_block.c 2011-01-13 08:03:22 -08:00
message
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mfd mfd: ab8500-core chip version cut 2.0 support 2011-01-14 12:38:18 +01:00
misc misc: Make AB8500_PWM driver depend on U8500 due to PWM breakage 2011-01-14 12:38:12 +01:00
mmc mmc: sdhci-of: fix build on non-powerpc platforms 2011-01-14 00:22:44 -07:00
mtd Merge git://git.infradead.org/mtd-2.6 2011-01-17 11:15:30 -08:00
net kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
nfc drivers/nfc/pn544.c: fix min_t warnings 2011-01-16 17:28:21 -08:00
nubus
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of dt/flattree: Return virtual address from early_init_dt_alloc_memory_arch() 2011-01-15 22:01:58 -07:00
oprofile
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parisc
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parport
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pci kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
pcmcia kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
platform Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2011-01-13 20:15:35 -08:00
pnp Merge branch 'pnp' into release 2011-01-12 04:59:44 -05:00
power Merge git://git.infradead.org/battery-2.6 2011-01-14 09:25:59 -08:00
pps pps: add parallel port PPS signal generator 2011-01-13 08:03:21 -08:00
ps3
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rapidio rapidio: add new idt sRIO switches 2011-01-13 08:03:18 -08:00
regulator regulator: Support MAX8998/LP3974 DVS-GPIO 2011-01-14 12:38:16 +01:00
rtc mfd: Support LP3974 RTC 2011-01-14 12:38:16 +01:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2011-01-19 20:25:45 -08:00
sbus sparc: explicitly cast negative phandle checks to s32 2011-01-03 20:02:06 -07:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-post-merge-2.6 2011-01-14 16:29:49 -08:00
sfi SFI: use ioremap_cache() instead of ioremap() 2011-01-11 23:27:25 -05:00
sh headers: kobject.h redux 2011-01-10 08:51:44 -08:00
sn
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spi Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus 2011-01-18 14:28:48 -08:00
ssb kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
staging [media] staging/lirc: fix mem leaks and ptr err usage 2011-01-19 12:52:22 -02:00
target [SCSI] target: Add LIO target core v4.0.0-rc6 2011-01-14 10:12:29 -06:00
tc
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telephony Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-01-13 10:05:56 -08:00
thermal Merge branch 'misc' into release 2011-01-12 05:14:15 -05:00
tty Merge branch 'akpm' 2011-01-20 17:02:14 -08:00
uio
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usb kconfig: rename CONFIG_EMBEDDED to CONFIG_EXPERT 2011-01-20 17:02:05 -08:00
uwb
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vhost vhost: fix signed/unsigned comparison 2011-01-10 10:03:39 +02:00
video backlight: fix 88pm860x_bl macro collision 2011-01-20 17:02:06 -08:00
virtio virtio: remove virtio-pci root device 2011-01-20 21:37:30 +10:30
vlynq
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w1 w1: DS2423 counter driver and documentation 2011-01-13 08:03:22 -08:00
watchdog watchdog: Add MCF548x watchdog driver. 2011-01-12 13:51:35 +00:00
xen Merge branch 'xen/xenbus' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen 2011-01-20 16:37:28 -08:00
zorro
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Kconfig [SCSI] target: Add LIO target core v4.0.0-rc6 2011-01-14 10:12:29 -06:00
Makefile Merge branch 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6 2011-01-20 16:39:23 -08:00