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linux-stable/drivers/dma
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Geert Uytterhoeven cf0fcc7fe2 dmaengine: rcar-dmac: Reject zero-length slave DMA requests 
[ Upstream commit 78efb76ab4 ]

While the .device_prep_slave_sg() callback rejects empty scatterlists,
it still accepts single-entry scatterlists with a zero-length segment.
These may happen if a driver calls dmaengine_prep_slave_single() with a
zero len parameter.  The corresponding DMA request will never complete,
leading to messages like:

    rcar-dmac e7300000.dma-controller: Channel Address Error happen

and DMA timeouts.

Although requesting a zero-length DMA request is a driver bug, rejecting
it early eases debugging.  Note that the .device_prep_dma_memcpy()
callback already rejects requests to copy zero bytes.

Reported-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Analyzed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-08-06 19:06:48 +02:00
..
bestcomm treewide: kmalloc() -> kmalloc_array() 2018-06-12 16:19:22 -07:00
dw dmaengine: dw: Fix FIFO size for Intel Merrifield 2018-12-13 09:16:19 +01:00
dw-axi-dmac dmaengine: dw-axi-dmac: fix null dereference when pointer first is null 2019-06-25 11:35:55 +08:00
hsu dmaengine: hsu: Support dmaengine_terminate_sync() 2018-07-10 21:10:44 +05:30
ioat driver/dma/ioat: Call del_timer_sync() without holding prep_lock 2018-11-13 11:08:36 -08:00
ipu treewide: Use array_size() in vmalloc() 2018-06-12 16:19:22 -07:00
mediatek dmaengine: mediatek: Add MediaTek High-Speed DMA controller for MT7622 and MT7623 SoC 2018-03-27 15:18:15 +05:30
ppc4xx dmaengine: ppc4xx: fix off-by-one build failure 2018-11-13 11:08:41 -08:00
qcom dmaengine: qcom: bam_dma: Fix completed descriptors count 2019-07-10 09:53:48 +02:00
sh dmaengine: rcar-dmac: Reject zero-length slave DMA requests 2019-08-06 19:06:48 +02:00
ti dmaengine: cppi41: delete channel from pending list when stop channel 2018-12-13 09:16:20 +01:00
xilinx dmaengine: xilinx_dma: Remove __aligned attribute on zynqmp_dma_desc_ll 2019-02-12 19:47:02 +01:00
acpi-dma.c
altera-msgdma.c dmaengine: altera: Use IRQ-safe spinlock calls in the error paths as well 2017-10-20 11:51:10 +05:30
amba-pl08x.c dmaengine: amba-pl08x: Use vchan_terminate_vdesc() instead of desc_free 2017-12-04 22:33:51 +05:30
at_hdmac.c dmaengine: at_hdmac: fix module unloading 2018-12-05 19:32:12 +01:00
at_hdmac_regs.h dmaengine: at_hdmac: Remove unnecessary 0x prefixes before %pad 2017-11-08 10:47:04 +05:30
at_xdmac.c dmaengine: at_xdmac: remove BUG_ON macro in tasklet 2019-05-31 06:46:17 -07:00
bcm-sba-raid.c treewide: Use struct_size() for devm_kmalloc() and friends 2018-06-06 11:15:43 -07:00
bcm2835-dma.c dmaengine: bcm2835: Fix abort of transactions 2019-02-12 19:47:24 +01:00
coh901318.c dmaengine: coh901318: Remove unnecessary 0x prefixes before %pad 2017-11-08 10:46:46 +05:30
coh901318.h
coh901318_lli.c
dma-axi-dmac.c dmaengine: axi-dmac: Request IRQ with IRQF_SHARED 2018-05-02 10:06:42 +05:30
dma-jz4740.c dmaengine: jz4740: disable/unprepare clk if probe fails 2017-12-11 09:00:06 +05:30
dma-jz4780.c dmaengine: dma-jz4780: Return error if not probed from DT 2018-11-13 11:08:38 -08:00
dmaengine.c Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax 2018-08-26 11:48:42 -07:00
dmaengine.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dmatest.c dmaengine: dmatest: Abort test in case of mapping error 2019-03-13 14:02:36 -07:00
ep93xx_dma.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
fsl-edma.c dmaengine: fsl-edma: disable clks on all error paths 2017-12-15 09:53:04 +05:30
fsl_raid.c dmaengine: fsl_raid: make of_device_ids const. 2017-06-29 09:25:28 +05:30
fsl_raid.h
fsldma.c dmaengine: fsldma: simplify getting .drvdata 2018-04-22 21:37:17 +05:30
fsldma.h dmaengine: fsldma: set BWC, DAHTS and SAHTS values correctly 2017-06-22 18:31:35 +05:30
idma64.c dmaengine: idma64: Use actual device for DMA transfers 2019-06-15 11:54:10 +02:00
idma64.h dmaengine: idma64: Use actual device for DMA transfers 2019-06-15 11:54:10 +02:00
img-mdc-dma.c dmaengine: img-mdc-dma: Use vchan_terminate_vdesc() instead of desc_free 2017-12-04 22:33:51 +05:30
imx-dma.c dmaengine: imx-dma: fix warning comparison of distinct pointer types 2019-04-05 22:33:15 +02:00
imx-sdma.c dmaengine: imx-sdma: fix use-after-free on probe error path 2019-07-26 09:13:56 +02:00
iop-adma.c
k3dma.c dmaengine: k3dma: Off by one in k3_of_dma_simple_xlate() 2018-06-28 11:57:21 +05:30
Kconfig Merge branch 'topic/imx' into for-linus 2018-08-17 17:59:27 +05:30
lpc18xx-dmamux.c
Makefile dmaengine: Add Actions Semi Owl family S900 DMA driver 2018-08-09 08:16:00 +05:30
mic_x100_dma.c dmaengine: mic_x100_dma: use devm_kzalloc to fix an issue 2018-08-27 11:16:04 +05:30
mic_x100_dma.h
mmp_pdma.c
mmp_tdma.c
moxart-dma.c treewide: Use struct_size() for kmalloc()-family 2018-06-06 11:15:43 -07:00
mpc512x_dma.c
mv_xor.c treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
mv_xor.h
mv_xor_v2.c dmaengine: mv_xor_v2: use {lower,upper}_32_bits to configure HW descriptor address 2018-07-25 17:53:22 +05:30
mxs-dma.c dmaengine: mxs-dma: Switch to SPDX identifier 2018-05-23 11:10:31 +05:30
nbpfaxi.c dmaengine: nbpfaxi: Mark expected switch fall-through 2018-07-09 17:01:35 +05:30
of-dma.c dmaengine: Convert to using %pOF instead of full_name 2017-07-19 09:30:44 +05:30
owl-dma.c dmaengine: Add Actions Semi Owl family S900 DMA driver 2018-08-09 08:16:00 +05:30
pch_dma.c dmaengine: pch_dma: Replace PCI pool old API 2017-10-31 17:01:06 +05:30
pl330.c dmaengine: pl330: _stop: clear interrupt status 2019-05-31 06:46:14 -07:00
pxa_dma.c dmaengine: pxa: add a default requestor policy 2018-06-18 21:29:23 +02:00
s3c24xx-dma.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
sa11x0-dma.c treewide: Use struct_size() for kmalloc()-family 2018-06-06 11:15:43 -07:00
sirf-dma.c
sprd-dma.c dmaengine: sprd: Fix block length overflow 2019-06-25 11:35:55 +08:00
st_fdma.c
st_fdma.h
ste_dma40.c dmaengine: ste_dma40: Remove VLA usage 2018-07-02 17:46:24 +05:30
ste_dma40_ll.c
ste_dma40_ll.h
stm32-dma.c dmaengine: stm32: replace "%p" with "%pK" 2018-07-09 23:01:57 +05:30
stm32-dmamux.c dmaengine: stm32-dmamux: fix a potential buffer overflow 2018-03-22 10:51:35 +05:30
stm32-mdma.c dmaengine: stm32: replace "%p" with "%pK" 2018-07-09 23:01:57 +05:30
sun4i-dma.c dmaengine: sun4i: fix invalid argument 2017-04-24 09:50:05 +05:30
sun6i-dma.c dmaengine: sun6i: Retrieve channel count/max request from devicetree 2017-10-23 11:44:03 +05:30
tegra20-apb-dma.c dmaengine: tegra-apb: Error out if DMA_PREP_INTERRUPT flag is unset 2019-08-06 19:06:47 +02:00
tegra210-adma.c dmaengine: tegra210-adma: use devm_clk_*() helpers 2019-05-31 06:46:31 -07:00
timb_dma.c dmaengine: timb_dma: fix spelling mistake: "Couldnt" -> "Couldn't" 2017-12-11 08:57:38 +05:30
TODO
txx9dmac.c dmaengine: txx9dmac: simplify getting .drvdata 2018-04-22 21:38:06 +05:30
txx9dmac.h
virt-dma.c dmaengine: virt-dma: Add helper to free/reuse a descriptor 2017-12-04 22:33:51 +05:30
virt-dma.h dmaengine: virt-dma: Support for race free transfer termination 2017-12-04 22:33:51 +05:30
xgene-dma.c dmaengine: xgene-dma: remove unused xgene_dma_invalidate_buffer 2017-08-22 22:13:44 +05:30
zx_dma.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00