ptdma: pt_core_execute_cmd() should use spinlock

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[ Upstream commit 95e5fda3b5 ]

The interrupt handler (pt_core_irq_handler()) of the ptdma
driver can be called from interrupt context. The code flow
in this function can lead down to pt_core_execute_cmd() which
will attempt to grab a mutex, which is not appropriate in
interrupt context and ultimately leads to a kernel panic.
The fix here changes this mutex to a spinlock, which has
been verified to resolve the issue.

Fixes: fa5d823b16 ("dmaengine: ptdma: Initial driver for the AMD PTDMA")
Signed-off-by: Eric Pilmore <epilmore@gigaio.com>
Link: https://lore.kernel.org/r/20230119033907.35071-1-epilmore@gigaio.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Eric Pilmore 2023-01-18 19:39:08 -08:00 • committed by Greg Kroah-Hartman

parent 0c5213ce6e

commit 13ba563c2c

2 changed files with 5 additions and 4 deletions

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7

drivers/dma/ptdma/ptdma-dev.c

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2

drivers/dma/ptdma/ptdma.h

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