diff options
| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2015-06-25 15:00:19 -0700 |
|---|---|---|
| committer | Mister Oyster <oysterized@gmail.com> | 2017-09-25 20:40:41 +0200 |
| commit | 3f32f766696c5af3cecb36394f2053d328d1cd48 (patch) | |
| tree | d41a1dd1cf4c5e0c92eac8e8190eb6d401d98c19 /drivers | |
| parent | b0b424cd85521711809ea5383e2fa59c6cf90f17 (diff) | |
zram: return zram device_id from zram_add()
This patch prepares zram to enable on-demand device creation.
zram_add() performs automatic device_id assignment and returns
new device id (>= 0) or error code (< 0).
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index b475bf22b..6151d49ee 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1110,20 +1110,24 @@ static struct attribute_group zram_disk_attr_group = { .attrs = zram_disk_attrs, }; -static int zram_add(int device_id) +/* + * Allocate and initialize new zram device. the function returns + * '>= 0' device_id upon success, and negative value otherwise. + */ +static int zram_add(void) { struct zram *zram; struct request_queue *queue; - int ret; + int ret, device_id; zram = kzalloc(sizeof(struct zram), GFP_KERNEL); if (!zram) return -ENOMEM; - ret = idr_alloc(&zram_index_idr, zram, device_id, - device_id + 1, GFP_KERNEL); + ret = idr_alloc(&zram_index_idr, zram, 0, 0, GFP_KERNEL); if (ret < 0) goto out_free_dev; + device_id = ret; init_rwsem(&zram->init_lock); @@ -1197,7 +1201,7 @@ static int zram_add(int device_id) zram->max_comp_streams = 1; pr_info("Added device: %s\n", zram->disk->disk_name); - return 0; + return device_id; out_free_disk: del_gendisk(zram->disk); @@ -1244,7 +1248,7 @@ static void destroy_devices(void) static int __init zram_init(void) { - int ret, dev_id; + int ret; zram_major = register_blkdev(0, "zram"); if (zram_major <= 0) { @@ -1252,10 +1256,11 @@ static int __init zram_init(void) return -EBUSY; } - for (dev_id = 0; dev_id < num_devices; dev_id++) { - ret = zram_add(dev_id); - if (ret != 0) + while (num_devices != 0) { + ret = zram_add(); + if (ret < 0) goto out_error; + num_devices--; } return 0; |