Achim Dahlhoff 129c337c66 dmaengine: sh: rcar-dmac: Fix glitch in dmaengine_tx_status ... commit 6e7da74775348d96e2d7efaf3f91410e18c481ef upstream. The tx_status poll in the rcar_dmac driver reads the status register which indicates which chunk is busy (DMACHCRB). Afterwards the point inside the chunk is read from DMATCRB. It is possible that the chunk has changed between the two reads. The result is a non-monotonous increase of the residue. Fix this by introducing a 'safe read' logic. Fixes: 73a47bd0da ("dmaengine: rcar-dmac: use TCRB instead of TCR for residue") Signed-off-by: Achim Dahlhoff <Achim.Dahlhoff@de.bosch.com> Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Cc: <stable@vger.kernel.org> # v4.16+ Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-05-02 09:58:55 +02:00
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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: sh: rcar-dmac: Fix glitch in dmaengine_tx_status	2019-05-02 09:58:55 +02:00
shdma-arm.h	dmaengine: shdma: Use defines instead of hardcoded numbers	2014-07-15 18:02:29 +09:00
shdma-base.c	treewide: kzalloc() -> kcalloc()	2018-06-12 16:19:22 -07:00
shdma-of.c	dmaengine: Remove .owner field for driver	2014-11-06 11:54:18 +05:30
shdma-r8a73a4.c	dmaengine: shdma: r8a73a4: Make dma_ts_shift[] static	2015-05-25 22:33:07 +05:30
shdma.h	dmaengine: sh: Rework Kconfig and Makefile	2014-07-31 17:15:45 +05:30
shdmac.c	dmaengine: shdmac: Change platform check to CONFIG_ARCH_RENESAS	2018-04-25 14:48:30 +05:30
sudmac.c	dmaengine: Remove site specific OOM error messages on kzalloc	2016-06-21 21:35:00 +05:30
usb-dmac.c	dmaengine: usb-dmac: Make DMAC system sleep callbacks explicit	2019-03-23 20:10:04 +01:00