lightnvm: pblk: remove internal IO timeout

Currently during pblk padding, there is internal IO timeout introduced,
which is smaller than default NVMe timeout. This can lead to various
use-after-free issues. Since in case of any IO timeouts NVMe and block
layer will handle timeout by themselves and report it back to use,
there is no need to keep this internal timeout in pblk.
Signed-off-by: Igor Konopko <igor.j.konopko@intel.com>
Signed-off-by: Matias Bjørling <mb@lightnvm.io>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-recovery.c

@@ -290,12 +290,7 @@ static int pblk_recov_pad_line(struct pblk *pblk, struct pblk_line *line,
 
 fail_complete:
 	kref_put(&pad_rq->ref, pblk_recov_complete);
-
-	if (!wait_for_completion_io_timeout(&pad_rq->wait,
-				msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) {
-		pblk_err(pblk, "pad write timed out\n");
-		ret = -ETIME;
-	}
+	wait_for_completion(&pad_rq->wait);
 
 	if (!pblk_line_is_full(line))
 		pblk_err(pblk, "corrupted padded line: %d\n", line->id);

drivers/lightnvm/pblk.h

@@ -43,8 +43,6 @@
 
 #define PBLK_CACHE_NAME_LEN (DISK_NAME_LEN + 16)
 
-#define PBLK_COMMAND_TIMEOUT_MS 30000
-
 /* Max 512 LUNs per device */
 #define PBLK_MAX_LUNS_BITMAP (4)