From: Yefim Barashkin <mr.b34r@xxxxxxxxxxxx> [ Upstream commit 0638c98c17aa12fe914459c82cd178247e21fb2b ] divide error: 0000 [#1] SMP PTI CPU: 3 PID: 78925 Comm: tee Not tainted 5.15.50-1-lts #1 Hardware name: MSI MS-7A59/Z270 SLI PLUS (MS-7A59), BIOS 1.90 01/30/2018 RIP: 0010:smu_v11_0_set_fan_speed_rpm+0x11/0x110 [amdgpu] Speed is user-configurable through a file. I accidentally set it to zero, and the driver crashed. Reviewed-by: Evan Quan <evan.quan@xxxxxxx> Reviewed-by: André Almeida <andrealmeid@xxxxxxxxxx> Signed-off-by: Yefim Barashkin <mr.b34r@xxxxxxxxxxxx> Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c index e6c93396434f..614c3d049514 100644 --- a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c +++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c @@ -1235,6 +1235,8 @@ int smu_v11_0_set_fan_speed_rpm(struct smu_context *smu, uint32_t crystal_clock_freq = 2500; uint32_t tach_period; + if (speed == 0) + return -EINVAL; /* * To prevent from possible overheat, some ASICs may have requirement * for minimum fan speed: -- 2.35.1
