[AMD Official Use Only - General] Reviewed-by: Evan Quan <evan.quan@xxxxxxx> > -----Original Message----- > From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Mr. > B34r > Sent: Saturday, July 9, 2022 10:31 AM > To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx > Cc: Vannoonnoo <mr.b34r@xxxxxxxxxxxx> > Subject: [PATCH] drm/amd/pm: Prevent divide by zero > > From: Vannoonnoo <mr.b34r@xxxxxxxxxxxx> > > divide error: 0000 [#1] SMP PTI > CPU: 3 PID: 78925 Comm: tee Not tainted 5.15.50-1-lts #1 > 5c320a339f0e397222fdfc9449eff04c0b12ea83 > 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. > > --- > drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c | 4 ++++ > 1 file changed, 4 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 5f8809f6990d..69cebdb58c04 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 > @@ -1236,6 +1236,10 @@ int smu_v11_0_set_fan_speed_rpm(struct > smu_context *smu, > * - For some Sienna Cichlid SKU, the fan speed cannot be set > * lower than 500 RPM. > */ > + > + if (speed == 0) > + return -EINVAL; > + > tach_period = 60 * crystal_clock_freq * 10000 / (8 * speed); > WREG32_SOC15(THM, 0, mmCG_TACH_CTRL, > REG_SET_FIELD(RREG32_SOC15(THM, 0, > mmCG_TACH_CTRL), > -- > 2.36.1
