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Staging: ramzswap: Free memory when create_device is failed

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If create_device is failed, it can't free gendisk and request_queue of
preceding devices. It cause memory leak.

This patch fixes it.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Minchan Kim 2010-01-11 16:15:53 +09:00 committed by Greg Kroah-Hartman
parent b76a32638d
commit 3bf040c752
1 changed files with 13 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
drivers/staging/ramzswap/ramzswap_drv.c
View file

@ -1292,7 +1292,7 @@ static struct block_device_operations ramzswap_devops = {
.owner = THIS_MODULE,
};
static void create_device(struct ramzswap *rzs, int device_id)
static int create_device(struct ramzswap *rzs, int device_id)
{
mutex_init(&rzs->lock);
INIT_LIST_HEAD(&rzs->backing_swap_extent_list);
@ -1301,7 +1301,7 @@ static void create_device(struct ramzswap *rzs, int device_id)
if (!rzs->queue) {
pr_err("Error allocating disk queue for device %d\n",
device_id);
return;
return 0;
}
blk_queue_make_request(rzs->queue, ramzswap_make_request);
@ -1313,7 +1313,7 @@ static void create_device(struct ramzswap *rzs, int device_id)
blk_cleanup_queue(rzs->queue);
pr_warning("Error allocating disk structure for device %d\n",
device_id);
return;
return 0;
}
rzs->disk->major = ramzswap_major;
@ -1331,6 +1331,7 @@ static void create_device(struct ramzswap *rzs, int device_id)
add_disk(rzs->disk);
rzs->init_done = 0;
return 1;
}
static void destroy_device(struct ramzswap *rzs)
@ -1368,16 +1369,20 @@ static int __init ramzswap_init(void)
/* Allocate the device array and initialize each one */
pr_info("Creating %u devices ...\n", num_devices);
devices = kzalloc(num_devices * sizeof(struct ramzswap), GFP_KERNEL);
if (!devices) {
ret = -ENOMEM;
if (!devices)
goto out;
}
for (i = 0; i < num_devices; i++)
create_device(&devices[i], i);
if (!create_device(&devices[i], i)) {
ret = i;
goto free_devices;
}
return 0;
free_devices:
for (i = 0; i < ret; i++)
destroy_device(&devices[i]);
out:
ret = -ENOMEM;
unregister_blkdev(ramzswap_major, "ramzswap");
return ret;
}