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authorBrent Taylor <motobud@gmail.com>2017-10-30 22:32:45 -0500
committerBoris Brezillon <boris.brezillon@free-electrons.com>2017-10-31 16:25:43 +0100
commit30863e38ebeb500a31cecee8096fb5002677dd9b (patch)
treef7158b29ff5af570e4ffab36c0ba445cfedb1d58 /drivers/mtd
parent1d2fcdcf33339c7c8016243de0f7f31cf6845e8d (diff)
downloadlinux-30863e38ebeb500a31cecee8096fb5002677dd9b.tar.bz2
mtd: nand: Fix writing mtdoops to nand flash.
When mtdoops calls mtd_panic_write(), it eventually calls panic_nand_write() in nand_base.c. In order to properly wait for the nand chip to be ready in panic_nand_wait(), the chip must first be selected. When using the atmel nand flash controller, a panic would occur due to a NULL pointer exception. Fixes: 2af7c6539931 ("mtd: Add panic_write for NAND flashes") Cc: <stable@vger.kernel.org> Signed-off-by: Brent Taylor <motobud@gmail.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/nand_base.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 4c867115c53b..e48bf8260f54 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2799,15 +2799,18 @@ static int panic_nand_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const uint8_t *buf)
{
struct nand_chip *chip = mtd_to_nand(mtd);
+ int chipnr = (int)(to >> chip->chip_shift);
struct mtd_oob_ops ops;
int ret;
- /* Wait for the device to get ready */
- panic_nand_wait(mtd, chip, 400);
-
/* Grab the device */
panic_nand_get_device(chip, mtd, FL_WRITING);
+ chip->select_chip(mtd, chipnr);
+
+ /* Wait for the device to get ready */
+ panic_nand_wait(mtd, chip, 400);
+
memset(&ops, 0, sizeof(ops));
ops.len = len;
ops.datbuf = (uint8_t *)buf;