openwrtv3/target/linux/ar71xx/patches-4.4/460-m25p80-spi-read-flash-check.patch

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--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -149,8 +149,10 @@ static int m25p80_read(struct spi_nor *n
msg.data_nbits = m25p80_rx_nbits(nor);
ret = spi_flash_read(spi, &msg);
- *retlen = msg.retlen;
- return ret;
+ if (!ret) {
+ *retlen = msg.retlen;
+ return 0;
+ }
}
spi_message_init(&m);