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Guennadi Liakhovetski a03a202e95 dmaengine: failure to get a specific DMA channel is not critical 
There exist systems with multiple DMA controllers with different
capabilities. For example, on some sh-mobile / rmobile systems there are
DMA controllers, whose channels can be configured to be used with
SD- and MMC-host controllers, serial ports etc. Besides there are also
DMA controllers, that can only be used for one special function, e.g.,
for USB. In such cases the DMA client filter function can just choose
to specify to the DMA driver, which channel it needs. Then the
.device_alloc_chan_resources() method of the DMA driver will check,
whether it can provide that dunction. If not, it will fail and the loop
in __dma_request_channel() will continue to the next DMA device, until
it finds a suitable one. This works fine with just one minor glitch:
the kernel logs error messages like

dmaengine: failed to get <channel name>: (-<error code>)

after each such non-critical failure. This patch lowers priority of
this message to the debug level.

Reported-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Tested-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2011-06-24 16:13:16 +05:30
..
accessibility
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2011-05-29 11:19:16 -07:00
amba ARM: 6829/1: amba: make hardcoded periphid override hardware 2011-05-26 10:33:34 +01:00
ata Merge branch 'for-2.6.40/core' of git://git.kernel.dk/linux-2.6-block 2011-05-25 09:14:07 -07:00
atm
auxdisplay
base mm: per-node vmstat: show proper vmstats 2011-05-25 08:39:07 -07:00
bcma drivers/bcma/host_pci.c needs slab.h 2011-05-26 17:12:32 -07:00
block Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2011-06-04 08:11:26 +09:00
bluetooth Revert "tty: make receive_buf() return the amout of bytes received" 2011-06-04 06:33:24 +09:00
cdrom block: fix mismerge of the DISK_EVENT_MEDIA_CHANGE removal 2011-06-02 05:29:19 +09:00
char virtio console: don't manually set or finalize VIRTIO_CONSOLE_F_MULTIPORT. 2011-05-30 11:14:13 +09:30
clk
clocksource Revert "clocksource: sh_cmt: Runtime PM support" 2011-05-31 15:26:42 +09:00
connector
cpufreq cpufreq: make DB8500 cpufreq driver compile 2011-05-24 22:20:14 +02:00
cpuidle Merge branch 'idle-release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6 2011-05-29 11:18:09 -07:00
crypto [S390] ap: skip device registration on type probe failure 2011-05-23 10:24:29 +02:00
dca
dio
dma dmaengine: failure to get a specific DMA channel is not critical 2011-06-24 16:13:16 +05:30
edac edac,rcu: use synchronize_rcu() instead of call_rcu()+rcu_barrier() 2011-05-26 17:12:37 -07:00
eisa
firewire
firmware Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-05-23 09:12:26 -07:00
gpio arm gpio drivers: make them 'depends on ARM' 2011-05-29 14:06:42 -07:00
gpu vmscan: change shrinker API by passing shrink_control struct 2011-05-25 08:39:26 -07:00
hid Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-05-23 12:33:02 -07:00
hwmon hwmon: (max6642): Better chip detection schema 2011-06-04 10:34:28 -07:00
hwspinlock
i2c mfd: Use mfd cell platform_data for timberdale cells platform bits 2011-05-26 19:45:05 +02:00
ide block: fix mismerge of the DISK_EVENT_MEDIA_CHANGE removal 2011-06-02 05:29:19 +09:00
idle
ieee802154
infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2011-05-26 12:13:57 -07:00
input Revert "tty: make receive_buf() return the amout of bytes received" 2011-06-04 06:33:24 +09:00
isdn Revert "tty: make receive_buf() return the amout of bytes received" 2011-06-04 06:33:24 +09:00
leds leds: Add ASIC3 LED support 2011-05-26 19:45:46 +02:00
lguest
macintosh Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-05-23 09:12:26 -07:00
mca
md dm kcopyd: return client directly and not through a pointer 2011-05-29 13:03:13 +01:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2011-05-27 10:14:22 -07:00
memstick
message Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-05-23 09:12:26 -07:00
mfd mfd: Fix build breakage caused by tps65910 gpio directory move 2011-05-28 08:38:55 +02:00
misc Revert "tty: make receive_buf() return the amout of bytes received" 2011-06-04 06:33:24 +09:00
mmc Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-05-27 19:51:32 -07:00
mtd Merge git://git.infradead.org/mtd-2.6 2011-05-27 20:06:53 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2011-06-04 23:16:00 +09:00
nfc
nubus
of Merge branch 'devicetree/arm-next' of git://git.secretlab.ca/git/linux-2.6 into devel-stable 2011-05-25 00:08:17 +01:00
oprofile oprofile: Use linux/mutex.h 2011-05-24 12:45:59 +02:00
parisc
parport Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 2011-05-26 13:19:00 -07:00
pci Merge git://git.infradead.org/iommu-2.6 2011-06-02 05:48:50 +09:00
pcmcia
platform Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mjg59/platform-drivers-x86 2011-05-29 11:44:33 -07:00
pnp
power Merge git://git.infradead.org/battery-2.6 2011-05-27 10:12:35 -07:00
pps
ps3
ptp ptp: Added a clock driver for the National Semiconductor PHYTER. 2011-05-23 13:10:23 -07:00
rapidio
regulator regulator: Fix _regulator_get_voltage if get_voltage callback is NULL 2011-05-27 10:49:30 +01:00
rtc spi/rtc-m41t93: Use spi_get_drvdata() for SPI devices 2011-06-08 14:33:48 -06:00
s390 [S390] irq: merge irq.c and s390_ext.c 2011-05-26 09:48:24 +02:00
sbus
scsi [SCSI] Fix oops caused by queue refcounting failure 2011-06-02 18:34:43 +09:00
sfi
sh Merge branch 'sh/genirq-threading' into sh-latest 2011-05-23 11:36:14 +09:00
sn
spi spi/ep93xx: add DMA support 2011-06-08 15:46:12 -06:00
ssb
staging Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6 2011-05-26 13:19:00 -07:00
target [SCSI] target: Convert TASK_ATTR to scsi_tcq.h definitions 2011-05-24 13:03:56 -04:00
tc
telephony
thermal
tty Revert "tty: make receive_buf() return the amout of bytes received" 2011-06-04 06:33:24 +09:00
uio
usb Merge branch 'for-usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/sarah/xhci 2011-05-28 12:36:15 -07:00
uwb
vhost vhost: support event index 2011-05-30 11:14:15 +09:30
video drivers/video/mb862xx/mb862xxfbdrv.c needs uaccess.h 2011-05-26 17:12:32 -07:00
virtio virtio: add api for delayed callbacks 2011-05-30 11:14:16 +09:30
vlynq
w1 w1: add Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC support 2011-05-26 17:12:38 -07:00
watchdog mfd: Use mfd cell platform_data for rdc321x cells platform bits 2011-05-26 19:45:06 +02:00
xen Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/djm/tmem 2011-05-26 10:50:56 -07:00
zorro
Kconfig ptp: Added a brand new class driver for ptp clocks. 2011-05-23 13:01:00 -07:00
Makefile Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2011-05-28 12:35:15 -07:00