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| author | James Clark <james.clark@arm.com> | 2023-01-10 11:07:34 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-10 09:33:31 +0100 |
| commit | 431d8b2d1457cae42959447e272eb31e995be42b (patch) | |
| tree | b27c1c95ded45ee41d3298b3fd1aa9720f34defb /drivers/virt | |
| parent | b0081745f6e66b1ce0446137b743af053689c397 (diff) | |
| download | linux-431d8b2d1457cae42959447e272eb31e995be42b.tar.gz | |
coresight: cti: Prevent negative values of enable count
[ Upstream commit 3244fb6dbbf1ffc114cdf382cc167bdd8c18088a ]
Writing 0 to the enable control repeatedly results in a negative value
for enable_req_count. After this, writing 1 to the enable control
appears to not work until the count returns to positive.
Change it so that it's impossible for enable_req_count to be < 0.
Return an error to indicate that the disable request was invalid.
Fixes: 835d722ba10a ("coresight: cti: Initial CoreSight CTI Driver")
Tested-by: Jinlong Mao <quic_jinlmao@quicinc.com>
Signed-off-by: James Clark <james.clark@arm.com>
Reviewed-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230110110736.2709917-2-james.clark@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/virt')
0 files changed, 0 insertions, 0 deletions