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| author |   Leonard Crestez <leonard.crestez@nxp.com> | 2019-11-26 17:17:11 +0200 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2019-11-29 12:02:36 +0100 |
| commit | c6a3aea93571a5393602256d8f74772bd64c8225 (patch) | |
| tree | 0127aba8dccc3ec1c187192b27064875fdb5ab69 /include/linux/pm_qos.h | |
| parent | Merge tag 'acpi-5.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm (diff) | |
| download | wireguard-linux-c6a3aea93571a5393602256d8f74772bd64c8225.tar.xz wireguard-linux-c6a3aea93571a5393602256d8f74772bd64c8225.zip | |
PM / QoS: Redefine FREQ_QOS_MAX_DEFAULT_VALUE to S32_MAX
QOS requests for DEFAULT_VALUE are supposed to be ignored but this is
not the case for FREQ_QOS_MAX. Adding one request for MAX_DEFAULT_VALUE
and one for a real value will cause freq_qos_read_value to unexpectedly
return MAX_DEFAULT_VALUE (-1).
This happens because freq_qos max value is aggregated with PM_QOS_MIN
but FREQ_QOS_MAX_DEFAULT_VALUE is (-1) so it's smaller than other
values.
Fix this by redefining FREQ_QOS_MAX_DEFAULT_VALUE to S32_MAX.
Looking at current users for freq_qos it seems that none of them create
requests for FREQ_QOS_MAX_DEFAULT_VALUE.
Fixes: 77751a466ebd ("PM: QoS: Introduce frequency QoS")
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reported-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Cc: 5.4+ <stable@vger.kernel.org> # 5.4+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'include/linux/pm_qos.h')
| -rw-r--r-- | include/linux/pm_qos.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/pm_qos.h b/include/linux/pm_qos.h index ebf5ef17cc2a..24a6263c9931 100644 --- a/include/linux/pm_qos.h +++ b/include/linux/pm_qos.h @@ -256,7 +256,7 @@ static inline s32 dev_pm_qos_raw_resume_latency(struct device *dev) #endif #define FREQ_QOS_MIN_DEFAULT_VALUE 0 -#define FREQ_QOS_MAX_DEFAULT_VALUE (-1) +#define FREQ_QOS_MAX_DEFAULT_VALUE S32_MAX enum freq_qos_req_type { FREQ_QOS_MIN = 1, |