[PATCH 1/2] xen/scsiback: correct frontend counting

From: Juergen Gross
Date: Fri Feb 05 2016 - 08:22:00 EST


When adding a new frontend to xen-scsiback don't decrement the number
of active frontends in case of no error. Not 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@xxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/xen/xen-scsiback.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index ad4eb10..51387d7 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -939,12 +939,12 @@ 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;
}
--
2.6.2