From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: [PATCH 3/3] iommu: Warn once when device_group callback returns NULL Date: Wed, 28 Jun 2017 14:00:58 +0200 Message-ID: <1498651258-23700-3-git-send-email-joro@8bytes.org> References: <1498651258-23700-1-git-send-email-joro@8bytes.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1498651258-23700-1-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: Joerg Roedel , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Gerald Schaefer List-Id: iommu@lists.linux-foundation.org From: Joerg Roedel This callback should never return NULL. Print a warning if that happens so that we notice and can fix it. Signed-off-by: Joerg Roedel --- drivers/iommu/iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index de09e1e..3f6ea16 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -1010,6 +1010,9 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev) if (ops && ops->device_group) group = ops->device_group(dev); + if (WARN_ON_ONCE(group == NULL)) + return ERR_PTR(-EINVAL); + if (IS_ERR(group)) return group; -- 2.7.4