diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index 7071c75..62e5fe4 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -190,7 +190,6 @@
 	}
 }
 
-/* XXX: totally ignores I/O errors */
 static void r5l_log_run_stripes(struct r5l_log *log)
 {
 	struct r5l_io_unit *io, *next;
@@ -213,6 +212,9 @@
 	struct r5l_log *log = io->log;
 	unsigned long flags;
 
+	if (bio->bi_error)
+		md_error(log->rdev->mddev, log->rdev);
+
 	bio_put(bio);
 
 	spin_lock_irqsave(&log->io_list_lock, flags);
@@ -598,6 +600,9 @@
 	unsigned long flags;
 	struct r5l_io_unit *io;
 
+	if (bio->bi_error)
+		md_error(log->rdev->mddev, log->rdev);
+
 	spin_lock_irqsave(&log->io_list_lock, flags);
 	list_for_each_entry(io, &log->flushing_ios, log_sibling)
 		r5l_io_run_stripes(io);
@@ -684,6 +689,7 @@
 		md_update_sb(mddev, 1);
 	}
 
+	/* discard IO error really doesn't matter, ignore it */
 	if (log->last_checkpoint < end) {
 		blkdev_issue_discard(bdev,
 				log->last_checkpoint + log->rdev->data_offset,
@@ -798,6 +804,13 @@
 	}
 }
 
+bool r5l_log_disk_error(struct r5conf *conf)
+{
+	if (!conf->log)
+		return false;
+	return test_bit(Faulty, &conf->log->rdev->flags);
+}
+
 struct r5l_recovery_ctx {
 	struct page *meta_page;		/* current meta */
 	sector_t meta_total_blocks;	/* total size of current meta and data */
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 693c000..68c36ce 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -3147,6 +3147,7 @@
 		 * the data has not reached the cache yet.
 		 */
 		if (!test_bit(R5_Wantfill, &sh->dev[i].flags) &&
+		    s->failed > conf->max_degraded &&
 		    (!test_bit(R5_Insync, &sh->dev[i].flags) ||
 		      test_bit(R5_ReadError, &sh->dev[i].flags))) {
 			spin_lock_irq(&sh->stripe_lock);
@@ -4015,6 +4016,7 @@
 	s->expanded = test_bit(STRIPE_EXPAND_READY, &sh->state) && !sh->batch_head;
 	s->failed_num[0] = -1;
 	s->failed_num[1] = -1;
+	s->log_failed = r5l_log_disk_error(conf);
 
 	/* Now to look around and see what can be done */
 	rcu_read_lock();
@@ -4358,7 +4360,7 @@
 	/* check if the array has lost more than max_degraded devices and,
 	 * if so, some requests might need to be failed.
 	 */
-	if (s.failed > conf->max_degraded) {
+	if (s.failed > conf->max_degraded || s.log_failed) {
 		sh->check_state = 0;
 		sh->reconstruct_state = 0;
 		break_stripe_batch_list(sh, 0);
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index 1ab534c..a415e1c 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -272,6 +272,7 @@
 	struct bio_list return_bi;
 	struct md_rdev *blocked_rdev;
 	int handle_bad_blocks;
+	int log_failed;
 };
 
 /* Flags for struct r5dev.flags */
@@ -631,4 +632,5 @@
 extern void r5l_stripe_write_finished(struct stripe_head *sh);
 extern int r5l_handle_flush_request(struct r5l_log *log, struct bio *bio);
 extern void r5l_quiesce(struct r5l_log *log, int state);
+extern bool r5l_log_disk_error(struct r5conf *conf);
 #endif