From: Srinivas Pandruvada srinivas.pandruvada@linux.intel.com
commit fe6a6de6692e7f7159c1ff42b07ecd737df712b4 upstream.
The following fixes are done for tcc sysfs interface: - TCC is 6 bits only from bit 29-24 - TCC of 0 is valid - When BIT(31) is set, this register is read only - Check for invalid tcc value - Error for negative values
Fixes: fdf4f2fb8e899 ("drivers: thermal: processor_thermal_device: Export sysfs interface for TCC offset") Signed-off-by: Srinivas Pandruvada srinivas.pandruvada@linux.intel.com Cc: stable@vger.kernel.org Acked-by: Zhang Rui rui.zhang@intel.com Signed-off-by: Daniel Lezcano daniel.lezcano@linaro.org Link: https://lore.kernel.org/r/20210628215803.75038-1-srinivas.pandruvada@linux.i... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/thermal/intel/int340x_thermal/processor_thermal_device.c | 20 ++++++---- 1 file changed, 12 insertions(+), 8 deletions(-)
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c @@ -100,24 +100,27 @@ static ssize_t tcc_offset_degree_celsius if (err) return err;
- val = (val >> 24) & 0xff; + val = (val >> 24) & 0x3f; return sprintf(buf, "%d\n", (int)val); }
-static int tcc_offset_update(int tcc) +static int tcc_offset_update(unsigned int tcc) { u64 val; int err;
- if (!tcc) + if (tcc > 63) return -EINVAL;
err = rdmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, &val); if (err) return err;
- val &= ~GENMASK_ULL(31, 24); - val |= (tcc & 0xff) << 24; + if (val & BIT(31)) + return -EPERM; + + val &= ~GENMASK_ULL(29, 24); + val |= (tcc & 0x3f) << 24;
err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val); if (err) @@ -126,14 +129,15 @@ static int tcc_offset_update(int tcc) return 0; }
-static int tcc_offset_save; +static unsigned int tcc_offset_save;
static ssize_t tcc_offset_degree_celsius_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { + unsigned int tcc; u64 val; - int tcc, err; + int err;
err = rdmsrl_safe(MSR_PLATFORM_INFO, &val); if (err) @@ -142,7 +146,7 @@ static ssize_t tcc_offset_degree_celsius if (!(val & BIT(30))) return -EACCES;
- if (kstrtoint(buf, 0, &tcc)) + if (kstrtouint(buf, 0, &tcc)) return -EINVAL;
err = tcc_offset_update(tcc);