[Intel-gfx] [PATCH 4/4] drm/i915/guc: Don't go bang in GuC log if no GuC

[Daniele Ceraolo Spurio]

On 12/2/2021 4:33 PM, Lucas De Marchi wrote:
> On Thu, Dec 02, 2021 at 04:06:23PM -0800, John.C.Harrison at Intel.com 
> wrote:
>> From: John Harrison <John.C.Harrison at Intel.com>
>>
>> If the GuC has failed to load for any reason and then the user pokes
>> the debugfs GuC log interface, a BUG and/or null pointer deref can
>> occur. Don't let that happen.
>>
>> Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
>
>
> Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>
>
> Lucas De Marchi
>

Do we need a fixes tag? or is it ok to not have it for debugfs bugs?

Daniele

>> ---
>> drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c 
>> b/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c
>> index 46026c2c1722..8fd068049376 100644
>> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c
>> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c
>> @@ -31,7 +31,7 @@ static int guc_log_level_get(void *data, u64 *val)
>> {
>>     struct intel_guc_log *log = data;
>>
>> -    if (!intel_guc_is_used(log_to_guc(log)))
>> +    if (!log->vma)
>>         return -ENODEV;
>>
>>     *val = intel_guc_log_get_level(log);
>> @@ -43,7 +43,7 @@ static int guc_log_level_set(void *data, u64 val)
>> {
>>     struct intel_guc_log *log = data;
>>
>> -    if (!intel_guc_is_used(log_to_guc(log)))
>> +    if (!log->vma)
>>         return -ENODEV;
>>
>>     return intel_guc_log_set_level(log, val);
>> -- 
>> 2.25.1
>>