scsi: sd: Move sd_read_cpr() out of the q->limits_lock region

Commit 804e498e0496 ("sd: convert to the atomic queue limits API")
introduced pairs of function calls to queue_limits_start_update() and
queue_limits_commit_update(). These two functions lock and unlock
q->limits_lock. In sd_revalidate_disk(), sd_read_cpr() is called after
queue_limits_start_update() call and before queue_limits_commit_update()
call. sd_read_cpr() locks q->sysfs_dir_lock and &q->sysfs_lock. Then new
lock dependencies were created between q->limits_lock, q->sysfs_dir_lock
and q->sysfs_lock, as follows:

sd_revalidate_disk
queue_limits_start_update
mutex_lock(&q->limits_lock)
sd_read_cpr
disk_set_independent_access_ranges
mutex_lock(&q->sysfs_dir_lock)
mutex_lock(&q->sysfs_lock)
mutex_unlock(&q->sysfs_lock)
mutex_unlock(&q->sysfs_dir_lock)
queue_limits_commit_update
mutex_unlock(&q->limits_lock)

However, the three locks already had reversed dependencies in other
places. Then the new dependencies triggered the lockdep WARN "possible
circular locking dependency detected" [1]. This WARN was observed by
running the blktests test case srp/002.

To avoid the WARN, move the sd_read_cpr() call in sd_revalidate_disk()
after the queue_limits_commit_update() call. In other words, move the
sd_read_cpr() call out of the q->limits_lock region.

[1] https://lore.kernel.org/linux-scsi/vlmv53ni3ltwxplig5qnw4xsl2h6ccxijfbqzekx76vxoim5a5@dekv7q3es3tx/

Fixes: 804e498e0496 ("sd: convert to the atomic queue limits API")
Signed-off-by: Shin'ichiro Kawasaki <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Tested-by: Luca Coelho <[e-mail]>
Reviewed-by: Damien Le Moal <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Bart Van Assche <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/sd.c

···
 			sd_read_block_limits_ext(sdkp);
 			sd_read_block_characteristics(sdkp, &lim);
 			sd_zbc_read_zones(sdkp, &lim, buffer);
-			sd_read_cpr(sdkp);
 		}
 
 		sd_print_capacity(sdkp, old_capacity);
···
 	blk_mq_unfreeze_queue(sdkp->disk->queue);
 	if (err)
 		return err;
+
+	/*
+	 * Query concurrent positioning ranges after
+	 * queue_limits_commit_update() unlocked q->limits_lock to avoid
+	 * deadlock with q->sysfs_dir_lock and q->sysfs_lock.
+	 */
+	if (sdkp->media_present && scsi_device_supports_vpd(sdp))
+		sd_read_cpr(sdkp);
 
 	/*
 	 * For a zoned drive, revalidating the zones can be done only once