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[3.19.y-ckt,085/196] xen/scsiback: correct frontend counting

Message ID 1457483454-30115-86-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa March 9, 2016, 12:29 a.m. UTC 
3.19.8-ckt16 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Juergen Gross <jgross@suse.com>

commit f285aa8db7cc4432c1a03f8b55ff34fe96317c11 upstream.

When adding a new frontend to xen-scsiback don't decrement the number
of active frontends in case of no error. Doing so results in a failure
when trying to remove the xen-pvscsi nexus even if no domain is using
it.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/xen/xen-scsiback.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
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Patch

diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 2d530c1..bb32b94 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -943,12 +943,12 @@  out:
 	spin_unlock_irqrestore(&info->v2p_lock, flags);
 
 out_free:
-	mutex_lock(&tpg->tv_tpg_mutex);
-	tpg->tv_tpg_fe_count--;
-	mutex_unlock(&tpg->tv_tpg_mutex);
-
-	if (err)
+	if (err) {
+		mutex_lock(&tpg->tv_tpg_mutex);
+		tpg->tv_tpg_fe_count--;
+		mutex_unlock(&tpg->tv_tpg_mutex);
 		kfree(new);
+	}
 
 	return err;
 }