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author | Nitin Gupta <ngupta@vflare.org> | 2010-01-28 15:43:40 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-03-04 00:42:53 (GMT) |
commit | de1a21a0f1f614dac0d8cacc13f41e32a15bba98 (patch) | |
tree | cc0704e2d83953e5fbe167b786fe97c72c827570 /drivers/staging/ramzswap | |
parent | 5d83d5a0b5ee332b724978d657c0af17f14e807e (diff) | |
download | linux-fsl-qoriq-de1a21a0f1f614dac0d8cacc13f41e32a15bba98.tar.xz |
Staging: ramzswap: Return proper error code on device create failure
Currently, we return 0 if create_device() fails and 1 otherwise.
Now, proper error code is returned from create_device() and the
same is propagated as module error code from ramzswap_init().
Also added some cleanups for ramzswap_init(), improving function
structure.
Signed-off-by: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/ramzswap')
-rw-r--r-- | drivers/staging/ramzswap/ramzswap_drv.c | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/drivers/staging/ramzswap/ramzswap_drv.c b/drivers/staging/ramzswap/ramzswap_drv.c index 2021ad6..3035add 100644 --- a/drivers/staging/ramzswap/ramzswap_drv.c +++ b/drivers/staging/ramzswap/ramzswap_drv.c @@ -1300,6 +1300,8 @@ static struct block_device_operations ramzswap_devops = { static int create_device(struct ramzswap *rzs, int device_id) { + int ret = 0; + mutex_init(&rzs->lock); spin_lock_init(&rzs->stat64_lock); INIT_LIST_HEAD(&rzs->backing_swap_extent_list); @@ -1308,7 +1310,8 @@ static int create_device(struct ramzswap *rzs, int device_id) if (!rzs->queue) { pr_err("Error allocating disk queue for device %d\n", device_id); - return 0; + ret = -ENOMEM; + goto out; } blk_queue_make_request(rzs->queue, ramzswap_make_request); @@ -1320,7 +1323,8 @@ static int 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 0; + ret = -ENOMEM; + goto out; } rzs->disk->major = ramzswap_major; @@ -1342,7 +1346,9 @@ static int create_device(struct ramzswap *rzs, int device_id) add_disk(rzs->disk); rzs->init_done = 0; - return 1; + +out: + return ret; } static void destroy_device(struct ramzswap *rzs) @@ -1358,18 +1364,20 @@ static void destroy_device(struct ramzswap *rzs) static int __init ramzswap_init(void) { - int i, ret; + int ret, dev_id; if (num_devices > max_num_devices) { pr_warning("Invalid value for num_devices: %u\n", num_devices); - return -EINVAL; + ret = -EINVAL; + goto out; } ramzswap_major = register_blkdev(0, "ramzswap"); if (ramzswap_major <= 0) { pr_warning("Unable to get major number\n"); - return -EBUSY; + ret = -EBUSY; + goto out; } if (!num_devices) { @@ -1380,21 +1388,25 @@ 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) - goto out; + if (!devices) { + ret = -ENOMEM; + goto unregister; + } - for (i = 0; i < num_devices; i++) - if (!create_device(&devices[i], i)) { - ret = i; + for (dev_id = 0; dev_id < num_devices; dev_id++) { + ret = create_device(&devices[dev_id], dev_id); + if (ret) goto free_devices; - } + } + return 0; + free_devices: - for (i = 0; i < ret; i++) - destroy_device(&devices[i]); -out: - ret = -ENOMEM; + while (dev_id) + destroy_device(&devices[--dev_id]); +unregister: unregister_blkdev(ramzswap_major, "ramzswap"); +out: return ret; } |