[PATCH] drm: fix uninitialized acquire_ctx fields (v2)

[Jani Nikula]

On Wed, 18 Jun 2014, Ville Syrjälä <ville.syrjala at linux.intel.com> wrote:
> On Sat, Jun 07, 2014 at 10:55:39AM -0400, Rob Clark wrote:
>> The acquire ctx will typically be declared on the stack, which means we
>> could have garbage values for any uninitialized field.  In this case, it
>> was triggering WARN_ON()s because 'contended' had garbage value.
>> 
>> Go ahead and use memset() to be more future-proof.
>> 
>> v2: now with extra brown paper bag
>> 
>> Reported-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
>> Signed-off-by: Rob Clark <robdclark at gmail.com>
>
> I thought I already gave these. Well here they are again:
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Tested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

https://bugzilla.kernel.org/show_bug.cgi?id=78401

>
>> ---
>>  drivers/gpu/drm/drm_modeset_lock.c | 1 +
>>  1 file changed, 1 insertion(+)
>> 
>> diff --git a/drivers/gpu/drm/drm_modeset_lock.c b/drivers/gpu/drm/drm_modeset_lock.c
>> index 7c2497d..0dc57d5 100644
>> --- a/drivers/gpu/drm/drm_modeset_lock.c
>> +++ b/drivers/gpu/drm/drm_modeset_lock.c
>> @@ -64,6 +64,7 @@
>>  void drm_modeset_acquire_init(struct drm_modeset_acquire_ctx *ctx,
>>  		uint32_t flags)
>>  {
>> +	memset(ctx, 0, sizeof(*ctx));
>>  	ww_acquire_init(&ctx->ww_ctx, &crtc_ww_class);
>>  	INIT_LIST_HEAD(&ctx->locked);
>>  }
>> -- 
>> 1.9.3
>
> -- 
> Ville Syrjälä
> Intel OTC
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-- 
Jani Nikula, Intel Open Source Technology Center