misc: fastrpc: Unmap only if buffer is unmapped from DSP

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commit 509143385d upstream.

For unmapping any buffer from kernel, it should first be unmapped
from DSP. In case unmap from DSP request fails, the map should not
be removed from kernel as it might lead to SMMU faults and other
memory issues.

Fixes: 5c1b97c7d7 ("misc: fastrpc: add support for FASTRPC_IOCTL_MEM_MAP/UNMAP")
Cc: stable <stable@kernel.org>
Signed-off-by: Ekansh Gupta <quic_ekangupt@quicinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20231013122007.174464-5-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ekansh Gupta 2023-10-13 13:20:07 +01:00 • committed by Greg Kroah-Hartman

parent 38c5faf2a9

commit cc87c73eac

1 changed files with 5 additions and 3 deletions

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drivers/misc/fastrpc.c

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