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Subject[PATCH 1/1] PCMCIA: resource, fix lock imbalance
Date
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>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
---
drivers/pcmcia/pcmcia_resource.c | 28 ++++++++++++++++------------
1 files changed, 16 insertions(+), 12 deletions(-)
diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index b2df041..add962a 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);

--
1.7.0.1



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