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linux/drivers/bus/mhi
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Qiang Yu 0a1129c4b4 bus: mhi: host: Fix race between channel preparation and M0 event 
commit 869a99907f upstream.

There is a race condition where mhi_prepare_channel() updates the
read and write pointers as the base address and in parallel, if
an M0 transition occurs, the tasklet goes ahead and rings
doorbells for all channels with a delta in TRE rings assuming
they are already enabled. This causes a null pointer access. Fix
it by adding a channel enabled check before ringing channel
doorbells.

Cc: stable@vger.kernel.org # 5.19
Fixes: a6e2e3522f "bus: mhi: core: Add support for PM state transitions"
Signed-off-by: Qiang Yu <quic_qianyu@quicinc.com>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://lore.kernel.org/r/1665889532-13634-1-git-send-email-quic_qianyu@quicinc.com
[mani: CCed stable list]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2023-01-07 11:11:54 +01:00
..
ep bus: mhi: ep: Check dev_set_name() return value 2022-07-09 11:57:54 +05:30
host bus: mhi: host: Fix race between channel preparation and M0 event 2023-01-07 11:11:54 +01:00
common.h bus: mhi: ep: Add support for sending events to the host 2022-04-26 13:17:41 +02:00
Kconfig bus: mhi: ep: Add support for registering MHI endpoint controllers 2022-04-26 13:17:40 +02:00
Makefile bus: mhi: ep: Add support for registering MHI endpoint controllers 2022-04-26 13:17:40 +02:00