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rbd: simplify error handling in rbd_add()

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If a couple pointers are initialized to NULL then a single
"out_nomem" label can be used for all of the memory allocation
failure cases in rbd_add().

Also, get rid of the "irc" local variable there.  There is no
real need for "rc" to be type ssize_t, and it can be used in
the spot "irc" was.

Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Alex Elder 2012-02-02 08:13:30 -06:00
parent 60571c7d55
commit 27cc25943f
1 changed files with 19 additions and 25 deletions
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44
drivers/block/rbd.c
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@ -2224,28 +2224,24 @@ static ssize_t rbd_add(struct bus_type *bus,
const char *buf,
size_t count)
{
struct ceph_osd_client *osdc;
struct rbd_device *rbd_dev;
ssize_t rc = -ENOMEM;
int irc;
char *mon_dev_name;
char *options;
char *mon_dev_name = NULL;
char *options = NULL;
struct ceph_osd_client *osdc;
int rc = -ENOMEM;
if (!try_module_get(THIS_MODULE))
return -ENODEV;
mon_dev_name = kmalloc(count, GFP_KERNEL);
if (!mon_dev_name)
goto err_out_mod;
options = kmalloc(count, GFP_KERNEL);
if (!options)
goto err_mon_dev;
/* new rbd_device object */
rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL);
if (!rbd_dev)
goto err_out_opt;
goto err_nomem;
mon_dev_name = kmalloc(count, GFP_KERNEL);
if (!mon_dev_name)
goto err_nomem;
options = kmalloc(count, GFP_KERNEL);
if (!options)
goto err_nomem;
/* static rbd_device initialization */
spin_lock_init(&rbd_dev->lock);
@ -2294,12 +2290,10 @@ static ssize_t rbd_add(struct bus_type *bus,
rbd_dev->poolid = rc;
/* register our block device */
irc = register_blkdev(0, rbd_dev->name);
if (irc < 0) {
rc = irc;
rc = register_blkdev(0, rbd_dev->name);
if (rc < 0)
goto err_out_client;
}
rbd_dev->major = irc;
rbd_dev->major = rc;
rc = rbd_bus_add_dev(rbd_dev);
if (rc)
@ -2332,15 +2326,15 @@ err_out_client:
rbd_put_client(rbd_dev);
err_put_id:
rbd_id_put(rbd_dev);
kfree(rbd_dev);
err_out_opt:
err_nomem:
kfree(options);
err_mon_dev:
kfree(mon_dev_name);
err_out_mod:
kfree(rbd_dev);
dout("Error adding device %s\n", buf);
module_put(THIS_MODULE);
return rc;
return (ssize_t) rc;
}
static struct rbd_device *__rbd_get_dev(unsigned long id)