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| author |   Tudor Ambarus <tudor.ambarus@microchip.com> | 2022-10-25 12:02:44 +0300 |
|---|---|---|
| committer |   Vinod Koul <vkoul@kernel.org> | 2022-11-08 10:43:57 +0530 |
| commit | 03ed9ba357cc78116164b90b87f45eacab60b561 (patch) | |
| tree | 210dedb5c5baeda627711aca508e97417300566a /drivers/gpu/drm/tiny/ssh:/git@git.zx2c4.com/git: | |
| parent | dmaengine: at_hdmac: Free the memset buf without holding the chan lock (diff) | |
| download | linux-dev-03ed9ba357cc78116164b90b87f45eacab60b561.tar.xz linux-dev-03ed9ba357cc78116164b90b87f45eacab60b561.zip | |
dmaengine: at_hdmac: Fix concurrency over the active list
The tasklet (atc_advance_work()) did not held the channel lock when
retrieving the first active descriptor, causing concurrency problems if
issue_pending() was called in between. If issue_pending() was called
exactly after the lock was released in the tasklet (atc_advance_work()),
atc_chain_complete() could complete a descriptor for which the controller
has not yet raised an interrupt.
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/20221025090306.297886-11-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/gpu/drm/tiny/ssh:/git@git.zx2c4.com/git:')
0 files changed, 0 insertions, 0 deletions