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zram: destroy all devices on error recovery path in zram_init() 

On error recovery path of zram_init(), it leaks the zram device object
causing the failure. So change create_device() to free allocated
resources on error path.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiang Liu 2013-06-07 00:07:24 +08:00 committed by Greg Kroah-Hartman
parent 57ab048532
commit 39a9b8ac93
1 changed files with 9 additions and 6 deletions
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15
drivers/staging/zram/zram_drv.c
View File

@ -595,7 +595,7 @@ static const struct block_device_operations zram_devops = {
static int create_device(struct zram *zram, int device_id) static int create_device(struct zram *zram, int device_id)
{ {
int ret = 0; int ret = -ENOMEM;
init_rwsem(&zram->lock); init_rwsem(&zram->lock);
init_rwsem(&zram->init_lock); init_rwsem(&zram->init_lock);
@ -605,7 +605,6 @@ static int create_device(struct zram *zram, int device_id)
if (!zram->queue) { if (!zram->queue) {
pr_err("Error allocating disk queue for device %d\n", pr_err("Error allocating disk queue for device %d\n",
device_id); device_id);
ret = -ENOMEM;
goto out; goto out;
} }
@ -615,11 +614,9 @@ static int create_device(struct zram *zram, int device_id)
/* gendisk structure */ /* gendisk structure */
zram->disk = alloc_disk(1); zram->disk = alloc_disk(1);
if (!zram->disk) { if (!zram->disk) {
blk_cleanup_queue(zram->queue);
pr_warn("Error allocating disk structure for device %d\n", pr_warn("Error allocating disk structure for device %d\n",
device_id); device_id);
ret = -ENOMEM; goto out_free_queue;
goto out;
} }
zram->disk->major = zram_major; zram->disk->major = zram_major;
@ -648,11 +645,17 @@ static int create_device(struct zram *zram, int device_id)
&zram_disk_attr_group); &zram_disk_attr_group);
if (ret < 0) { if (ret < 0) {
pr_warn("Error creating sysfs group"); pr_warn("Error creating sysfs group");
goto out; goto out_free_disk;
} }
zram->init_done = 0; zram->init_done = 0;
return 0;
out_free_disk:
del_gendisk(zram->disk);
put_disk(zram->disk);
out_free_queue:
blk_cleanup_queue(zram->queue);
out: out:
return ret; return ret;
} }