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| author | Tudor Ambarus <tudor.ambarus@microchip.com> | 2022-10-25 12:02:47 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2022-11-08 08:13:57 +0300 |
| commit | 580ee84405c27d6ed419abe4d2b3de1968abdafd (patch) | |
| tree | 2a9ed9d6c292a6a4a3a20289544fd1f595714504 /drivers/dma/stm32-dmamux.c | |
| parent | ef2cb4f0ce479f77607b04c4b0414bf32f863ee8 (diff) | |
| download | linux-580ee84405c27d6ed419abe4d2b3de1968abdafd.tar.xz | |
dmaengine: at_hdmac: Don't allow CPU to reorder channel enable
at_hdmac uses __raw_writel for register writes. In the absence of a
barrier, the CPU may reorder the register operations.
Introduce a write memory barrier so that the CPU does not reorder the
channel enable, thus the start of the transfer, without making sure that
all the pre-required register fields are already written.
Fixes: dc78baa2b90b ("dmaengine: at_hdmac: new driver for the Atmel AHB DMA Controller")
Reported-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/lkml/13c6c9a2-6db5-c3bf-349b-4c127ad3496a@axentia.se/
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com
Link: https://lore.kernel.org/r/20221025090306.297886-14-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/stm32-dmamux.c')
0 files changed, 0 insertions, 0 deletions