drm/msm/gem: Add missing rcu_dereference()

Fixes a sparse "different address spaces" error.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202406280050.syeEwLTE-lkp@intel.com/
Signed-off-by: Rob Clark <robdclark@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/601612/

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index ddc6a131c041a06d2f77e4adbbc4114ad1a31205..ebc9ba66efb89dce467088af17d8d546b8d4ae6a 100644 (file)
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -48,7 +48,7 @@ static void update_ctx_mem(struct drm_file *file, ssize_t size)
        uint64_t ctx_mem = atomic64_add_return(size, &ctx->ctx_mem);
 
        rcu_read_lock(); /* Locks file->pid! */
-       trace_gpu_mem_total(0, pid_nr(file->pid), ctx_mem);
+       trace_gpu_mem_total(0, pid_nr(rcu_dereference(file->pid)), ctx_mem);
        rcu_read_unlock();
 
 }