PCMCIA: resource, fix lock imbalance

Stanse found that one error path (when alloc_skb fails) in netdev_tx
omits to unlock hw_priv->hwlock. Fix that by moving away from unlock in
each fail path. Unlock at one place instead.

Introduced in 94a819f80297e1f635a7cde4ed5317612e512ba7
(pcmcia: assert locking to struct pcmcia_device)

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 16 insertions, 12 deletions

diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index ef782c09f029..c4612c52e4cb 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -256,6 +256,7 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
 {
         struct pcmcia_socket *s;
         config_t *c;
+        int ret;
 
         s = p_dev->socket;
 
@@ -264,13 +265,13 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
 
         if (!(s->state & SOCKET_PRESENT)) {
                 dev_dbg(&s->dev, "No card present\n");
-                mutex_unlock(&s->ops_mutex);
-                return -ENODEV;
+                ret = -ENODEV;
+                goto unlock;
         }
         if (!(c->state & CONFIG_LOCKED)) {
                 dev_dbg(&s->dev, "Configuration isnt't locked\n");
-                mutex_unlock(&s->ops_mutex);
-                return -EACCES;
+                ret = -EACCES;
+                goto unlock;
         }
 
         if (mod->Attributes & CONF_IRQ_CHANGE_VALID) {
@@ -286,7 +287,8 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
 
         if (mod->Attributes & CONF_VCC_CHANGE_VALID) {
                 dev_dbg(&s->dev, "changing Vcc is not allowed at this time\n");
-                return -EINVAL;
+                ret = -EINVAL;
+                goto unlock;
         }
 
         /* We only allow changing Vpp1 and Vpp2 to the same value */
@@ -294,21 +296,21 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
             (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
                 if (mod->Vpp1 != mod->Vpp2) {
                         dev_dbg(&s->dev, "Vpp1 and Vpp2 must be the same\n");
-                        mutex_unlock(&s->ops_mutex);
-                        return -EINVAL;
+                        ret = -EINVAL;
+                        goto unlock;
                 }
                 s->socket.Vpp = mod->Vpp1;
                 if (s->ops->set_socket(s, &s->socket)) {
-                        mutex_unlock(&s->ops_mutex);
                         dev_printk(KERN_WARNING, &s->dev,
                                    "Unable to set VPP\n");
-                        return -EIO;
+                        ret = -EIO;
+                        goto unlock;
                 }
         } else if ((mod->Attributes & CONF_VPP1_CHANGE_VALID) ||
                    (mod->Attributes & CONF_VPP2_CHANGE_VALID)) {
                 dev_dbg(&s->dev, "changing Vcc is not allowed at this time\n");
-                mutex_unlock(&s->ops_mutex);
-                return -EINVAL;
+                ret = -EINVAL;
+                goto unlock;
         }
 
         if (mod->Attributes & CONF_IO_CHANGE_WIDTH) {
@@ -332,9 +334,11 @@ int pcmcia_modify_configuration(struct pcmcia_device *p_dev,
                         s->ops->set_io_map(s, &io_on);
                 }
         }
+        ret = 0;
+unlock:
         mutex_unlock(&s->ops_mutex);
 
-        return 0;
+        return ret;
 } /* modify_configuration */
 EXPORT_SYMBOL(pcmcia_modify_configuration);