diff options
author | Brent Taylor <motobud@gmail.com> | 2017-10-31 06:32:45 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-05 13:22:51 +0300 |
commit | c8ea49b690eef5c180369a8d132c5e50a74b3acf (patch) | |
tree | 7e437ebb73afca634f6177244654807889538309 | |
parent | a155a9568d9abf50fe4913c4bf7b46a8281d3dc3 (diff) | |
download | linux-c8ea49b690eef5c180369a8d132c5e50a74b3acf.tar.xz |
mtd: nand: Fix writing mtdoops to nand flash.
commit 30863e38ebeb500a31cecee8096fb5002677dd9b upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/mtd/nand/nand_base.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 54ab48827258..7ba109e8cf88 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2663,15 +2663,18 @@ 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->priv; + 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; |