From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Hannes Reinecke hare@suse.de
commit 98af4d4df889dcea3bc0ce6b8a04759658ba8826 upstream.
Register default sysfs groups during device_add_disk() to avoid a race condition with udev during startup.
Signed-off-by: Hannes Reinecke hare@suse.com Cc: Minchan Kim minchan@kernel.org Cc: Nitin Gupta ngupta@vflare.org Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Bart Van Assche bart.vanassche@wdc.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Jeffle Xu jefflexu@linux.alibaba.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/block/zram/zram_drv.c | 26 ++++++-------------------- 1 file changed, 6 insertions(+), 20 deletions(-)
--- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -1644,6 +1644,11 @@ static const struct attribute_group zram .attrs = zram_disk_attrs, };
+static const struct attribute_group *zram_disk_attr_groups[] = { + &zram_disk_attr_group, + NULL, +}; + /* * Allocate and initialize new zram device. the function returns * '>= 0' device_id upon success, and negative value otherwise. @@ -1724,24 +1729,14 @@ static int zram_add(void)
zram->disk->queue->backing_dev_info->capabilities |= (BDI_CAP_STABLE_WRITES | BDI_CAP_SYNCHRONOUS_IO); - add_disk(zram->disk); + device_add_disk(NULL, zram->disk, zram_disk_attr_groups);
- ret = sysfs_create_group(&disk_to_dev(zram->disk)->kobj, - &zram_disk_attr_group); - if (ret < 0) { - pr_err("Error creating sysfs group for device %d\n", - device_id); - goto out_free_disk; - } strlcpy(zram->compressor, default_compressor, sizeof(zram->compressor));
zram_debugfs_register(zram); pr_info("Added device: %s\n", zram->disk->disk_name); return device_id;
-out_free_disk: - del_gendisk(zram->disk); - put_disk(zram->disk); out_free_queue: blk_cleanup_queue(queue); out_free_idr: @@ -1770,15 +1765,6 @@ static int zram_remove(struct zram *zram mutex_unlock(&bdev->bd_mutex);
zram_debugfs_unregister(zram); - /* - * Remove sysfs first, so no one will perform a disksize - * store while we destroy the devices. This also helps during - * hot_remove -- zram_reset_device() is the last holder of - * ->init_lock, no later/concurrent disksize_store() or any - * other sysfs handlers are possible. - */ - sysfs_remove_group(&disk_to_dev(zram->disk)->kobj, - &zram_disk_attr_group);
/* Make sure all the pending I/O are finished */ fsync_bdev(bdev);