diff mbox

[dpdk-dev,V20,3/4] igb_uio: fix uio release issue when hot unplug

Message ID 1524058689-4954-4-git-send-email-jia.guo@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation fail Compilation issues

Commit Message

Guo, Jia April 18, 2018, 1:38 p.m. UTC 
  when device being hot unplug, release a none exist uio resource will
result kernel null pointer error, so this patch will check if device
has been remove before release uio release procedure, if so just return
back.

Signed-off-by: Jeff Guo <jia.guo@intel.com>
---
v20->v19:
split patch independently.
---
 kernel/linux/igb_uio/igb_uio.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox

Patch

diff --git a/kernel/linux/igb_uio/igb_uio.c b/kernel/linux/igb_uio/igb_uio.c
index cbc5ab6..c296332 100644
--- a/kernel/linux/igb_uio/igb_uio.c
+++ b/kernel/linux/igb_uio/igb_uio.c
@@ -344,6 +344,10 @@  igbuio_pci_release(struct uio_info *info, struct inode *inode)
 	struct rte_uio_pci_dev *udev = info->priv;
 	struct pci_dev *dev = udev->pdev;
 
+	/* check if device has been remove before release */
+	if ((&dev->dev.kobj)->state_remove_uevent_sent == 1)
+		return -1;
+
 	mutex_lock(&udev->lock);
 	if (--udev->refcnt > 0) {
 		mutex_unlock(&udev->lock);