On system suspend when system memory is low then i915_gem_obj_copy_ttm() could fail trying to backup a lmem obj. GEM_WARN_ON() is not enough, suspend shouldn't continue if i915_ttm_backup() throws an error. References: https://gitlab.freedesktop.org/drm/intel/-/issues/6529 Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx> Suggested-by: Chris P Wilson <chris.p.wilson@xxxxxxxxx> Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx> --- drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c index 9aad84059d56..6f5d5c0909b4 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c @@ -79,7 +79,12 @@ static int i915_ttm_backup(struct i915_gem_apply_to_region *apply, goto out_no_populate; err = i915_gem_obj_copy_ttm(backup, obj, pm_apply->allow_gpu, false); - GEM_WARN_ON(err); + if (err) { + drm_err(&i915->drm, + "Unable to copy from device to system memory, err:%d\n", + err); + goto out_no_populate; + } ttm_bo_wait_ctx(backup_bo, &ctx); obj->ttm.backup = backup; -- 2.35.1
