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drm/amd/pm: Prevent divide by zero 

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@amd.com>
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Signed-off-by: Yefim Barashkin <mr.b34r@kolabnow.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Yefim Barashkin 2022-07-11 14:35:11 -08:00 committed by Alex Deucher
parent add61d3c31
commit 0638c98c17
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
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@ -1228,6 +1228,8 @@ 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: