diff options
| author | Tudor Ambarus <tudor.ambarus@microchip.com> | 2022-10-25 12:02:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-16 10:04:14 +0100 |
| commit | de7493265bd065b6d3ad519ce72daf12d439618d (patch) | |
| tree | 2c19b5ecbd0fa4322987308c896fdfc1a06fe766 /sound/core/memalloc.c | |
| parent | 833da33da9e52252fc15de8bbc2ad0b950e2e341 (diff) | |
dmaengine: at_hdmac: Don't allow CPU to reorder channel enable
commit 580ee84405c27d6ed419abe4d2b3de1968abdafd upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/core/memalloc.c')
0 files changed, 0 insertions, 0 deletions