lightnvm: pblk: propagate errors when reading meta

Read errors are not correctly propagated. Errors are cleared before
returning control to the io submitter. Change the behaviour such that
all read errors exept high ecc read warning status is returned
appropriately.
Signed-off-by: NIgor Konopko <igor.j.konopko@intel.com>
Reviewed-by: NJavier González <javier@javigon.com>
Reviewed-by: NHans Holmberg <hans.holmberg@cnexlabs.com>
Signed-off-by: NMatias Bjørling <mb@lightnvm.io>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-core.c

@@ -761,8 +761,10 @@ int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line)
 
 	atomic_dec(&pblk->inflight_io);
 
-	if (rqd.error)
+	if (rqd.error && rqd.error != NVM_RSP_WARN_HIGHECC) {
 		pblk_log_read_err(pblk, &rqd);
+		ret = -EIO;
+	}
 
 clear_rqd:
 	pblk_free_rqd_meta(pblk, &rqd);
@@ -916,8 +918,11 @@ int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
 
 	atomic_dec(&pblk->inflight_io);
 
-	if (rqd.error)
+	if (rqd.error && rqd.error != NVM_RSP_WARN_HIGHECC) {
 		pblk_log_read_err(pblk, &rqd);
+		ret = -EIO;
+		goto free_rqd_dma;
+	}
 
 	emeta_buf += rq_len;
 	left_ppas -= rq_ppas;

drivers/lightnvm/pblk-recovery.c

@@ -458,7 +458,7 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line,
 	atomic_dec(&pblk->inflight_io);
 
 	/* If a read fails, do a best effort by padding the line and retrying */
-	if (rqd->error) {
+	if (rqd->error && rqd->error != NVM_RSP_WARN_HIGHECC) {
 		int pad_distance, ret;
 
 		if (padded) {