On 三, 2019-01-02 at 21:29 -0500, Thara Gopinath wrote: > On 11/27/2018 05:43 PM, Thara Gopinath wrote: > > > > Sysfs interface to update cooling device cur_state does not > > currently holding cooling device lock sometimes leading to > > stale values in cur_state if getting updated simultanelously > > from user space and thermal framework. Adding the proper locking > > code fixes this issue. > > > > Signed-off-by: Thara Gopinath <thara.gopin...@linaro.org> > > --- > > > > V1->V2: Rearranged the code as per Daniel's review comment > Hi Eduardo, Daniel > > Any comments on this ? > it's already in my tree, and will be included in my pull request which will be sent out soon.
thanks, rui > Regards > Thara > > > > > > > drivers/thermal/thermal_sysfs.c | 11 +++++++---- > > 1 file changed, 7 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/thermal/thermal_sysfs.c > > b/drivers/thermal/thermal_sysfs.c > > index 2241cea..aa99edb 100644 > > --- a/drivers/thermal/thermal_sysfs.c > > +++ b/drivers/thermal/thermal_sysfs.c > > @@ -712,11 +712,14 @@ cur_state_store(struct device *dev, struct > > device_attribute *attr, > > if ((long)state < 0) > > return -EINVAL; > > > > + mutex_lock(&cdev->lock); > > + > > result = cdev->ops->set_cur_state(cdev, state); > > - if (result) > > - return result; > > - thermal_cooling_device_stats_update(cdev, state); > > - return count; > > + if (!result) > > + thermal_cooling_device_stats_update(cdev, state); > > + > > + mutex_unlock(&cdev->lock); > > + return result ? result : count; > > } > > > > static struct device_attribute > > > >
