[Xen-devel] [PATCH v2 1/2] xen/scsiback: correct frontend counting

[Juergen Gross <jgross@xxxxxxxx>]

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@xxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
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


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