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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>
This commit is contained in:
Mike Christie 2017-06-23 01:18:20 -05:00 committed by Nicholas Bellinger
parent 531283ff75
commit 9260695d65
1 changed files with 5 additions and 1 deletions
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6
drivers/target/target_core_user.c
View File

@ -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 {