mtd: nand: Fix writing mtdoops to nand flash.
commit30863e38eb
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:2af7c65399
("mtd: Add panic_write for NAND flashes") 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>
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@ -2800,15 +2800,18 @@ static int panic_nand_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const uint8_t *buf)
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{
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struct nand_chip *chip = mtd_to_nand(mtd);
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int chipnr = (int)(to >> chip->chip_shift);
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struct mtd_oob_ops ops;
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int ret;
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/* Wait for the device to get ready */
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panic_nand_wait(mtd, chip, 400);
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/* Grab the device */
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panic_nand_get_device(chip, mtd, FL_WRITING);
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chip->select_chip(mtd, chipnr);
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/* Wait for the device to get ready */
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panic_nand_wait(mtd, chip, 400);
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memset(&ops, 0, sizeof(ops));
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ops.len = len;
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ops.datbuf = (uint8_t *)buf;
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