Commit Graph

449 Commits

Author SHA1 Message Date
Dan Williams
c50a898fd4 ioat2: fix performance regression
Commit 0793448 "DMAENGINE: generic channel status v2" changed the interface for
how dma channel progress is retrieved.  It inadvertently exported an internal
helper function ioat_tx_status() instead of ioat_dma_tx_status().  The latter
polls the hardware to get the latest completion state, while the helper just
evaluates the current state without touching hardware.  The effect is that we
end up waiting for completion timeouts or descriptor allocation errors before
the completion state is updated.

iperf (before fix):
[SUM]  0.0-41.3 sec   364 MBytes  73.9 Mbits/sec

iperf (after fix):
[SUM]  0.0- 4.5 sec   499 MBytes   940 Mbits/sec

This is a regression starting with 2.6.35.

Cc: <stable@kernel.org>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Jesse Brandeburg <jesse.brandeburg@intel.com>
Cc: Linus Walleij <linus.walleij@stericsson.com>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Reported-by: Richard Scobie <richard@sauce.co.nz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-10-13 15:43:10 -07:00
Simon Guinot
cc60f8878e dmaengine: fix interrupt clearing for mv_xor
When using simultaneously the two DMA channels on a same engine, some
transfers are never completed. For example, an endless lock can occur
while writing heavily on a RAID5 array (with async-tx offload support
enabled).

Note that this issue can also be reproduced by using the DMA test
client.

On a same engine, the interrupt cause register is shared between two
DMA channels. This patch make sure that the cause bit is only cleared
for the requested channel.

Signed-off-by: Simon Guinot <sguinot@lacie.com>
Tested-by: Luc Saillard <luc@saillard.org>
Acked-by: saeed bishara <saeed.bishara@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-09-23 14:14:22 -07:00
Dan Carpenter
9f9ff20d46 dma/shdma: move dereference below the NULL check
"param" can be NULL here, so only dereference it after the check.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-09-22 15:29:17 -07:00
Linus Torvalds
58d4ea65b9 Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6
* 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6:
  mmc_spi: Fix unterminated of_match_table
  of/sparc: fix build regression from of_device changes
  of/device: Replace struct of_device with struct platform_device
2010-08-12 09:11:31 -07:00
Russell King
0b019a4155 Merge branches 'master' and 'devel' into for-linus
Conflicts:
	arch/arm/Kconfig
	arch/arm/mm/Kconfig
2010-08-10 23:17:52 +01:00
Linus Torvalds
dcded10f6d Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (30 commits)
  DMAENGINE: at_hdmac: locking fixlet
  DMAENGINE: pch_dma: kill another usage of __raw_{read|write}l
  dma: dmatest: fix potential sign bug
  ioat2: catch and recover from broken vtd configurations v6
  DMAENGINE: add runtime slave control to COH 901 318 v3
  DMAENGINE: add runtime slave config to DMA40 v3
  DMAENGINE: generic slave channel control v3
  dmaengine: Driver for Topcliff PCH DMA controller
  intel_mid: Add Mrst & Mfld DMA Drivers
  drivers/dma: Eliminate a NULL pointer dereference
  dma/timb_dma: compile warning on 32 bit
  DMAENGINE: ste_dma40: support older silicon
  DMAENGINE: ste_dma40: support disabling physical channels
  DMAENGINE: ste_dma40: no disabled phy channels on ux500
  DMAENGINE: ste_dma40: fix suspend bug
  DMAENGINE: ste_dma40: add DB8500 memcpy channels
  DMAENGINE: ste_dma40: no flow control on memcpy
  DMAENGINE: ste_dma40: arch updates for LCLA and LCPA
  DMAENGINE: ste_dma40: allocate LCLA dynamically
  DMAENGINE: ste_dma40: no premature stop
  ...

Fix up trivial conflicts in arch/arm/mach-ux500/devices-db8500.c
2010-08-09 21:00:07 -07:00
Russell King
500b9fc922 Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/genesis-2.6 into devel-stable
Conflicts:
	drivers/net/irda/sh_irda.c
2010-08-06 18:13:19 +01:00
Grant Likely
2dc1158137 of/device: Replace struct of_device with struct platform_device
of_device is just an alias for platform_device, so remove it entirely.  Also
replace to_of_device() with to_platform_device() and update comment blocks.

This patch was initially generated from the following semantic patch, and then
edited by hand to pick up the bits that coccinelle didn't catch.

@@
@@
-struct of_device
+struct platform_device

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Reviewed-by: David S. Miller <davem@davemloft.net>
2010-08-06 09:25:50 -06:00
Yong Wang
b0ebeb9c09 DMAENGINE: at_hdmac: locking fixlet
atc_chain_complete shall be called with atchan->lock held
and bh disabled.

Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-08-04 22:09:17 -07:00
Yong Wang
61cd220376 DMAENGINE: pch_dma: kill another usage of __raw_{read|write}l
Use {read|write}l instead of __raw_{read|write}l since PCH DMA
controller is PCI device.

Signed-off-by: Yong Wang <yong.y.wang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-08-04 22:08:45 -07:00
Kulikov Vasiliy
b9033e682e dma: dmatest: fix potential sign bug
'cnt' is unsigned, so this code may become wrong in future as
dmatest_add_threads() can return error code:

	cnt = dmatest_add_threads(dtc, DMA_MEMCPY);
	thread_count += cnt > 0 ? cnt : 0;
		        ^^^^^^^

Now it can return only -EINVAL if and only if second argument of
dmatest_add_threads() is not one of DMA_MEMCPY, DMA_XOR, DMA_PQ.
So, now it is not wrong but may become wrong in future.

The semantic patch that finds this problem (many false-positive results):
(http://coccinelle.lip6.fr/)

// <smpl>
@ r1 @
identifier f;
@@
int f(...) { ... }

@@
identifier r1.f;
type T;
unsigned T x;
@@

*x = f(...)
 ...
*x > 0

Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-08-04 14:27:47 -07:00
Dan Williams
556ab45f9a ioat2: catch and recover from broken vtd configurations v6
On some platforms (MacPro3,1) the BIOS assigns the ioatdma device to the
incorrect iommu causing faults when the driver initializes.  Add a quirk
to catch this misconfiguration and try falling back to untranslated
operation (which works in the MacPro3,1 case).

Assuming there are other platforms with misconfigured iommus teach the
ioatdma driver to treat initialization failures as non-fatal (just fail
the driver load and emit a warning instead of triggering a BUG_ON).

This can be classified as a boot regression since 2.6.32 on affected
platforms since the ioatdma module did not autoload prior to that
kernel.

Cc: <stable@kernel.org>
Acked-by: David Woodhouse <David.Woodhouse@intel.com>
Reported-by: Chris Li <lkml@chrisli.org>
Tested-by: Chris Li <lkml@chrisli.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-08-04 14:18:17 -07:00
Linus Walleij
128f904ac8 DMAENGINE: add runtime slave control to COH 901 318 v3
This extends the DMA engine driver for the COH 901 318 used in the
U300 platform with the generic runtime slave control command.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-08-04 14:15:44 -07:00
Linus Walleij
95e1400fa1 DMAENGINE: add runtime slave config to DMA40 v3
This extends the DMA engine driver for the DMA40 used in the
U8500 platform with the generic runtime slave configuration
interface.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-08-04 14:14:05 -07:00
Yong Wang
0c42bd0e42 dmaengine: Driver for Topcliff PCH DMA controller
Topcliff PCH is the platform controller hub that is going to
be used in Intel's upcoming general embedded platforms. This
adds the driver for Topcliff PCH DMA controller. The DMA
channels are strictly for device to host or host to device
transfers and cannot be used for generic memcpy.

Signed-off-by: Yong Wang <yong.y.wang@intel.com>
[kill GFP_ATOMIC, kill __raw_{read|write}l, locking fixlet]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-08-04 14:12:05 -07:00
Jiri Kosina
d790d4d583 Merge branch 'master' into for-next 2010-08-04 15:14:38 +02:00
Stefan Weil
c2e07b3a9c Fix spelling contorller -> controller in comments
Cc: Jiri Kosina <trivial@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-08-04 15:05:43 +02:00
Vinod Koul
b3c567e474 intel_mid: Add Mrst & Mfld DMA Drivers
This patch add DMA drivers for DMA controllers in Langwell chipset
of Intel(R) Moorestown platform and DMA controllers in Penwell of
Intel(R) Medfield platfrom

This patch adds support for Moorestown DMAC1 and DMAC2 controllers.
It also add support for Medfiled GP DMA and DMAC1 controllers.
These controllers supports memory to peripheral and peripheral to
memory transfers. It support only single block transfers.

This driver is based on Kernel DMA engine
Anyone who wishes to use this controller should use DMA engine APIs

This controller exposes DMA_SLAVE capabilities and notifies the client drivers
of DMA transaction completion

Config option required to be enabled CONFIG_INTEL_MID_DMAC=y

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-07-27 23:32:57 -07:00
Paul Mundt
285eba57db Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Conflicts:
	include/linux/serial_sci.h

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-07-05 15:46:08 +09:00
Dan Williams
3e6b02d9f5 of/dma: fix build breakage in ppc4xx adma driver
Convert ppc4xx adma driver to use new node pointer location

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-02 15:46:17 -06:00
Dan Williams
084a2ab9c2 Merge branch 'timb' into dmaengine 2010-07-01 02:29:19 -07:00
Julia Lawall
4856800501 drivers/dma: Eliminate a NULL pointer dereference
If td_desc is NULL, just skip both kfrees.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
expression E,E1;
identifier f;
statement S1,S2,S3;
@@

if ((E == NULL && ...) || ...)
{
  ... when != if (...) S1 else S2
      when != E = E1
* E->f
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-07-01 02:27:35 -07:00
Dan Carpenter
efcc289817 dma/timb_dma: compile warning on 32 bit
This silences a compile warning on 32 bit systems:
drivers/dma/timb_dma.c:203: warning: cast to pointer from integer of different size

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-07-01 02:27:31 -07:00
Linus Walleij
f41855929c DMAENGINE: ste_dma40: support older silicon
This makes sure the DMA40 driver will also work on the oldest
silicon revisions that have the on-chip memory on another location
in the DB8500 and also requires explicit suspend before starting
or resuming a logical channel.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
[added parenthesis to the definition of U8500_DMA_LCPA_BASE_ED]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:06:42 -07:00
Jonas Aaberg
6b7acd8442 DMAENGINE: ste_dma40: support disabling physical channels
This makes it possible to disable physical channels.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:57 -07:00
Jonas Aaberg
d181b3a8cb DMAENGINE: ste_dma40: fix suspend bug
This fixes a bug when suspending channels: first make the checks,
then suspend the channel, not the other way around.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:56 -07:00
Linus Walleij
508849ade2 DMAENGINE: ste_dma40: allocate LCLA dynamically
Switch to allocating LCLA in memory instead of having a fixed
address.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:55 -07:00
Jonas Aaberg
1d392a7ba4 DMAENGINE: ste_dma40: no premature stop
Correct bug that could cause paused channels to stop.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:55 -07:00
Jonas Aaberg
2123a61e17 DMAENGINE: ste_dma40: interrupts only on dst
We don't want interrupts when the source is done, only when
the destination is done and everything is complete at the
recieveing end of a transfer.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:55 -07:00
Jonas Aaberg
0c32269d81 DMAENGINE: ste_dma40: avoid doing unnessecary suspend
Avoid doing unnessecary suspend when modifying logical channels.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:54 -07:00
Jonas Aaberg
2292b880e4 DMAENGINE: ste_dma40: lock fix
Fix up some locking issues found by enabling lock debugging.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:54 -07:00
Jonas Aaberg
0d0f6b8bbb DMAENGINE: ste_dma40: deny ops on non-alloc channels
Added checks to deny operating on none-allocated channels.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:54 -07:00
Jonas Aaberg
2a6143407d DMAENGINE: ste_dma40: various cosmetic clean-ups
This cleans up some extra newlines, removes some code duplication
and moves the code to comply better with checkpatch.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:54 -07:00
Jonas Aaberg
ff0b12baa5 DMAENGINE: ste_dma40: improve allocation error handling
Better error handling when channel allocation fails.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:54 -07:00
Jonas Aaberg
c675b1b424 DMAENGINE: ste_dma40: use kmem cache
Use kmem cache instead of own cache, reducing code duplication
and bug sources.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:53 -07:00
Per Friden
a8be8627a3 DMAENGINE: ste_dma40: moved freeing of client owned desc
fixed typo and moved freeing of client owned desc to free_dma.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:53 -07:00
Linus Walleij
ef1872ec65 DMAENGINE: ste_dma40: only write phy channel config first time
We only need to write the configuration to a physical channel if
it is free, else it is already written.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:53 -07:00
Per Friden
941b77a3b6 DMAENGINE: ste_dma40: fixed lli_max=1 issue
Fixed lli_max=1 issue in case of full lcla, currently this case
is not properly handled.

Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-06-22 18:01:53 -07:00
Jiri Kosina
f1bbbb6912 Merge branch 'master' into for-next 2010-06-16 18:08:13 +02:00
Uwe Kleine-König
421f91d21a fix typos concerning "initiali[zs]e"
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-06-16 18:05:05 +02:00
Anatolij Gustschin
05c02542c2 of/dma: fix build breakage in ppc4xx adma driver
Fixes build error caused by the OF device_node
pointer being moved into struct device

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-06-02 21:02:39 -06:00
Anatolij Gustschin
b4a75c91b8 of/dma: mpc512x_dma.c: Fix build failures
Fixes build errors caused by the:
 - OF device_node pointer being moved into struct device
 - removal of the match_table field from struct of_platform_driver

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-06-02 13:45:08 -06:00
Paul Mundt
d5b732b17c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2010-05-31 13:14:26 +09:00
Linus Torvalds
e38c1e54ce Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx:
  DMAENGINE: DMA40 U8500 platform configuration
  DMA: PL330: Add dma api driver
2010-05-30 09:12:43 -07:00
Alexey Dobriyan
4be929be34 kernel-wide: replace USHORT_MAX, SHORT_MAX and SHORT_MIN with USHRT_MAX, SHRT_MAX and SHRT_MIN
- C99 knows about USHRT_MAX/SHRT_MAX/SHRT_MIN, not
  USHORT_MAX/SHORT_MAX/SHORT_MIN.

- Make SHRT_MIN of type s16, not int, for consistency.

[akpm@linux-foundation.org: fix drivers/dma/timb_dma.c]
[akpm@linux-foundation.org: fix security/keys/keyring.c]
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-05-25 08:07:02 -07:00
Linus Torvalds
0fed2b5cb4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6: (25 commits)
  sh: fix up sh7785lcr_32bit_defconfig.
  arch/sh/lib/strlen.S: Checkpatch cleanup
  sh: fix up sh7786 dmaengine build.
  sh: guard cookie consistency across termination in the DMA driver
  sh: prevent the DMA driver from unloading, while in use
  sh: fix Oops in the serial SCI driver
  sh: allow platforms to specify SD-card supported voltages
  mmc: let MFD's provide supported Vdd card voltages to tmio_mmc
  sh: disable SD-card write-protection detection on kfr2r09
  mfd: pass platform flags down to the tmio_mmc driver
  tmio: add a platform flag to disable card write-protection detection
  sh: Add SDHI DMA support to migor
  sh: Add SDHI DMA support to kfr2r09
  sh: Add SDHI DMA support to ms7724se
  sh: Add SDHI DMA support to ecovec
  mmc: add DMA support to tmio_mmc driver, when used on SuperH
  sh: prepare the SDHI MFD driver to pass DMA configuration to tmio_mmc.c
  mmc: prepare tmio_mmc for passing of DMA configuration from the MFD cell
  sh: add DMA slave definitions to sh7724
  sh: add DMA slaves for two SDHI controllers to sh7722
  ...
2010-05-24 07:58:28 -07:00
Jassi Brar
b3040e4067 DMA: PL330: Add dma api driver
Add DMA Engine API driver for the PL330 DMAC.
This driver is supposed to be reusable by various
platforms that have one or more PL330 DMACs.
Atm, DMA_SLAVE and DMA_MEMCPY capabilities have been
implemented.

Signed-off-by: Jassi Brar <jassi.brar@samsung.com>
Reviewed-by: Linus Walleij <linus.walleij@stericsson.com>
[dan.j.williams@intel.com: missing slab.h and ->device_control() fixups]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2010-05-23 20:28:19 -07:00
Paul Mundt
1f782fee18 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2010-05-24 08:52:55 +09:00
Guennadi Liakhovetski
9255f1deec sh: guard cookie consistency across termination in the DMA driver
If all descriptors on a channel are terminated or the channel is released,
update the completed cookie counter to match the last cookie. This prevents
inconsistency warning on resumed DMA operation.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-05-22 17:06:35 +09:00
Guennadi Liakhovetski
7a5c106a0e sh: prevent the DMA driver from unloading, while in use
This prevents the driver from unloading, while it is in use. Unloading of the
driver, while its DMA channels are held, leads to a kernel Oops.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2010-05-22 17:06:34 +09:00