From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754012AbdDQQ0I (ORCPT ); Mon, 17 Apr 2017 12:26:08 -0400 Received: from anholt.net ([50.246.234.109]:34536 "EHLO anholt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752107AbdDQQ0F (ORCPT ); Mon, 17 Apr 2017 12:26:05 -0400 From: Eric Anholt To: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, Eric Anholt Subject: [PATCH] drm/vc4: Fix refcounting of runtime PM get if it errors out. Date: Mon, 17 Apr 2017 09:26:03 -0700 Message-Id: <20170417162603.12726-1-eric@anholt.net> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We were returning without decrementing if the error happened, meaning that at the next submit we wouldn't try to bring up the power domain. Signed-off-by: Eric Anholt --- I stumbled across this error when testing my CMA patch with a very low (64MB) CMA area -- we would oops on the submit after the one that failed. drivers/gpu/drm/vc4/vc4_gem.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c index 777a8d9afd60..735412e3725a 100644 --- a/drivers/gpu/drm/vc4/vc4_gem.c +++ b/drivers/gpu/drm/vc4/vc4_gem.c @@ -1016,13 +1016,16 @@ vc4_submit_cl_ioctl(struct drm_device *dev, void *data, } mutex_lock(&vc4->power_lock); - if (vc4->power_refcount++ == 0) + if (vc4->power_refcount++ == 0) { ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); - mutex_unlock(&vc4->power_lock); - if (ret < 0) { - kfree(exec); - return ret; + if (ret < 0) { + mutex_unlock(&vc4->power_lock); + vc4->power_refcount--; + kfree(exec); + return ret; + } } + mutex_unlock(&vc4->power_lock); exec->args = args; INIT_LIST_HEAD(&exec->unref_list); -- 2.11.0