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....@intel.com>
---
v21->v20:
no change
---
kernel/linux/igb_uio/igb_uio.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/linux/igb_uio/igb_uio.c b/kernel/linux/igb_uio/igb_uio.c
index cd9b7e7..f0b1cfe 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);
--
2.7.4
