diff options
| author | Tudor Ambarus <tudor.ambarus@microchip.com> | 2022-10-25 12:02:44 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-16 12:04:13 +0300 |
| commit | ece84823eaab0f293d36f48b87797c88a82b0575 (patch) | |
| tree | b90fe8f4ee482175f58c23ea51d7239fbd493f61 /drivers/net/dummy.c | |
| parent | f4daa0bf7d34bd94280bed49d22a2c353acb8877 (diff) | |
| download | linux-ece84823eaab0f293d36f48b87797c88a82b0575.tar.xz | |
dmaengine: at_hdmac: Fix concurrency over the active list
commit 03ed9ba357cc78116164b90b87f45eacab60b561 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/dummy.c')
0 files changed, 0 insertions, 0 deletions