Re: [PATCHv2] Thermal: Fix synchronization issues in thermal_sys.c

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On Thu, Sep 27, 2012 at 10:01 AM, Sedat Dilek <sedat.dilek@xxxxxxxxx> wrote:
> On Thu, Sep 27, 2012 at 8:38 AM, Durgadoss R <durgadoss.r@xxxxxxxxx> wrote:
>> This patch fixes the following mutex and NULL pointer
>> problems in thermal_sys.c:
>>  * mutex_unlock fix in update_temperature function
>>  * mutex_unlock fix in bind_cdev function
>>  * NULL check fix in bind_tz function
>>
>> Reported-by: Sedat Dilek <sedat.dilek@xxxxxxxxx>
>> Reported-by: Hugh Dickins <hughd@xxxxxxxxxx>
>> Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
>> ---
>> v2:
>>  * Removed unnecessary NULL check in bind_cdev
>>  * Added 'Reported-by' tags for Sedat and Hugh
>>  drivers/thermal/thermal_sys.c |    7 ++++---
>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
>> index 4f77d89..e1179d3 100644
>> --- a/drivers/thermal/thermal_sys.c
>> +++ b/drivers/thermal/thermal_sys.c
>> @@ -253,7 +253,7 @@ static void bind_cdev(struct thermal_cooling_device *cdev)
>>
>>                 tzp = pos->tzp;
>>                 if (!tzp->tbp)
>> -                       return;
>> +                       continue;
>>
>>                 for (i = 0; i < tzp->num_tbps; i++) {
>>                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
>> @@ -289,7 +289,7 @@ static void bind_tz(struct thermal_zone_device *tz)
>>                 goto exit;
>>         }
>>
>> -       if (!tzp->tbp)
>> +       if (!tzp || !tzp->tbp)
>>                 goto exit;
>>
>>         list_for_each_entry(pos, &thermal_cdev_list, node) {
>> @@ -390,12 +390,13 @@ static void update_temperature(struct thermal_zone_device *tz)
>>         ret = tz->ops->get_temp(tz, &temp);
>>         if (ret) {
>>                 pr_warn("failed to read out thermal zone %d\n", tz->id);
>> -               return;
>> +               goto exit;
>>         }
>>
>>         tz->last_temperature = tz->temperature;
>>         tz->temperature = temp;
>>
>> +exit:
>>         mutex_unlock(&tz->lock);
>>  }
>>
>> --
>> 1.7.9.5
>>
>
> The v2 patch does *not* fix the issue here!
>
> [1] https://patchwork.kernel.org/patch/1511961/
>

I have re-tested with Linux-Next (next-20120927) plus thermal-next [1]
pulled in and see still the same call-trace!

Hugh or Dan can you confirm this works for you or not?
Thanks in advance.

[1] http://git.kernel.org/?p=linux/kernel/git/rzhang/linux.git;a=shortlog;h=refs/heads/next
[2] http://git.kernel.org/?p=linux/kernel/git/rzhang/linux.git;a=commitdiff;h=404b134156bd9d9bc506c0974a1254806e13db2c

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