msm-4.14

mirror of https://github.com/rd-stuffs/msm-4.14.git synced 2025-02-20 11:45:48 +08:00

History

Yoshihiro Shimoda b3b2630720 dmaengine: rcar-dmac: Check the done lists in rcar_dmac_chan_get_residue()

[ Upstream commit 3e081628d510b2ddbe493371d9c574d9275da17e ]

This patch fixes an issue that a race condition happens between a client
driver and the rcar-dmac driver:

- The rcar_dmac_isr_transfer_end() is called.
 - The done list appears, and desc.running is the next active list.
- rcar_dmac_chan_get_residue() is called by a client driver before
  rcar_dmac_isr_channel_thread() is called.
 - The rcar_dmac_chan_get_residue() will not find any descriptors.
 - And, the following WARNING happens:
	WARN(1, "No descriptor for cookie!");

The sh-sci driver with HSCIF (921,600bps) on R-Car H3 can cause this
situation.
So, this patch checks the done lists in rcar_dmac_chan_get_residue()
and returns zero if the done lists has the argument cookie.

Tested-by: Nguyen Viet Dung <dung.nguyen.aj@renesas.com>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-05-30 07:52:36 +02:00

Kconfig

dmaengine: sh: Use ARCH_RENESAS

2016-02-08 08:48:08 +05:30

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rcar-dmac.c

dmaengine: rcar-dmac: Check the done lists in rcar_dmac_chan_get_residue()

2018-05-30 07:52:36 +02:00

shdma-arm.h

dmaengine: shdma: Use defines instead of hardcoded numbers