openwrt/target/linux/ar71xx/patches-4.4/464-spi-ath79-fix-fast-flash-read.patch

--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -159,6 +159,9 @@ static int m25p80_read(struct spi_nor *n
 	flash->command[0] = nor->read_opcode;
 	m25p_addr2cmd(nor, from, flash->command);
 
+	if (dummy == 1)
+		t[0].dummy = true;
+
 	t[0].type = SPI_TRANSFER_FLASH_READ_CMD;
 	t[0].tx_buf = flash->command;
 	t[0].len = m25p_cmdsz(nor) + dummy;
--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -268,6 +268,10 @@ static int ath79_spi_do_read_flash_cmd(s
 	sp->read_addr = 0;
 
 	len = t->len - 1;
+
+	if (t->dummy)
+		len -= 1;
+
 	p = t->tx_buf;
 
 	while (len--) {
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -710,6 +710,7 @@ struct spi_transfer {
 	u16		delay_usecs;
 	u32		speed_hz;
 	enum spi_transfer_type type;
+	bool dummy;
 
 	struct list_head transfer_list;
 };