[PATCH 3/3] mtd: nand-imx: don't copy more bytes than read from hardware

[Uwe Kleine-König]

The NFC command used for reading the result of a READID command to the NAND chip
reads 6 bytes (in x8 mode) or 6 words (in x16 mode with the upper bytes all
being 0). So there is no need to safe 16 bytes for later consumption.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig at pengutronix.de>
---
 drivers/mtd/nand/nand_imx.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_imx.c b/drivers/mtd/nand/nand_imx.c
index 685750991389..00c05d00afe3 100644
--- a/drivers/mtd/nand/nand_imx.c
+++ b/drivers/mtd/nand/nand_imx.c
@@ -362,7 +362,11 @@ static void send_read_id_v3(struct imx_nand_host *host)
 
 	wait_op_done(host);
 
-	memcpy(host->data_buf, host->main_area0, 16);
+	/*
+	 * NFC_ID results in reading 6 bytes or words (depending on data width),
+	 * so copying 3 32-bit values is just fine.
+	 */
+	memcpy(host->data_buf, host->main_area0, 12);
 }
 
 static void send_read_param_v3(struct imx_nand_host *host)
-- 
2.1.4