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| author | Mike Christie <mchristi@redhat.com> | 2017-06-23 01:18:20 -0500 |
|---|---|---|
| committer | Nicholas Bellinger <nab@linux-iscsi.org> | 2017-07-06 23:11:42 -0700 |
| commit | 9260695d65590f4711d1166eadbfcb0acfa0625a (patch) | |
| tree | a5578a39bf795f15434f557a7b716dd40fe1abe5 /drivers/target | |
| parent | 531283ff7593f7059ced43c725d90cec3e5af549 (diff) | |
| download | linux-stable-9260695d65590f4711d1166eadbfcb0acfa0625a.tar.gz linux-stable-9260695d65590f4711d1166eadbfcb0acfa0625a.tar.bz2 linux-stable-9260695d65590f4711d1166eadbfcb0acfa0625a.zip | |
tcmu: fix multiple uio open/close sequences
If the uio device is open and closed multiple times, the
kref count will be off due to tcmu_release getting called
multiple times for each close. This patch integrates
Wenji Tang's patch to add a kref_get on open that now
matches the kref_put done on tcmu_release and adds
a kref_put in tcmu_destroy_device to match the kref_get
done in succesful tcmu_configure_device calls.
Signed-off-by: Mike Christie <mchristi@redhat.com>
Cc: Wenji Tang <tang.wenji@zte.com.cn>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_user.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index d10aa0ac0918..1e69b1b32558 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -1269,6 +1269,7 @@ static int tcmu_open(struct uio_info *info, struct inode *inode) return -EBUSY; udev->inode = inode; + kref_get(&udev->kref); pr_debug("open\n"); @@ -1300,7 +1301,7 @@ static int tcmu_release(struct uio_info *info, struct inode *inode) clear_bit(TCMU_DEV_BIT_OPEN, &udev->flags); pr_debug("close\n"); - /* release ref from configure */ + /* release ref from open */ kref_put(&udev->kref, tcmu_dev_kref_release); return 0; } @@ -1596,6 +1597,9 @@ static void tcmu_destroy_device(struct se_device *dev) tcmu_netlink_event(udev, TCMU_CMD_REMOVED_DEVICE, 0, NULL); uio_unregister_device(&udev->uio_info); + + /* release ref from configure */ + kref_put(&udev->kref, tcmu_dev_kref_release); } enum { |