UBI: always warn if case of I/O errors

Currently UBI silently retries I/O operation in case of errors. This patch
makes it emit a warning before retrying. This should allow users notice issues
earlier.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

drivers/mtd/ubi/io.c

@@ -189,7 +189,7 @@ int ubi_io_read(const struct ubi_device *ubi, void *buf, int pnum, int offset,
 		}
 
 		if (retries++ < UBI_IO_RETRIES) {
-			dbg_io("error %d%s while reading %d bytes from PEB "
+			ubi_warn("error %d%s while reading %d bytes from PEB "
 				 "%d:%d, read only %zd bytes, retry",
 				 err, errstr, len, pnum, offset, read);
 			yield();
@@ -364,7 +364,7 @@ static int do_sync_erase(struct ubi_device *ubi, int pnum)
 	err = mtd_erase(ubi->mtd, &ei);
 	if (err) {
 		if (retries++ < UBI_IO_RETRIES) {
-			dbg_io("error %d while erasing PEB %d, retry",
+			ubi_warn("error %d while erasing PEB %d, retry",
 				 err, pnum);
 			yield();
 			goto retry;
@@ -383,7 +383,7 @@ static int do_sync_erase(struct ubi_device *ubi, int pnum)
 
 	if (ei.state == MTD_ERASE_FAILED) {
 		if (retries++ < UBI_IO_RETRIES) {
-			dbg_io("error while erasing PEB %d, retry", pnum);
+			ubi_warn("error while erasing PEB %d, retry", pnum);
 			yield();
 			goto retry;
 		}