Patch "mtd: nand: Fix writing mtdoops to nand flash." has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

mtd: nand: Fix writing mtdoops to nand flash.

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mtd-nand-fix-writing-mtdoops-to-nand-flash.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Brent Taylor <[email protected]>
Date: Mon, 30 Oct 2017 22:32:45 -0500
Subject: mtd: nand: Fix writing mtdoops to nand flash.

From: Brent Taylor <[email protected]>

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.

---
 drivers/mtd/nand/nand_base.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

@@ -2935,15 +2935,18 @@ static int panic_nand_write(struct mtd_i
 			    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;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/mtd-nand-fix-writing-mtdoops-to-nand-flash.patch