Masahiro Yamada 336d139f87 mtd: rawnand: denali: do not pass zero maxchips to nand_scan() ... Commit 49aa76b166 ("mtd: rawnand: do not execute nand_scan_ident() if maxchips is zero") gave a new meaning for calling nand_scan_ident() with maxchips=0. It is a special usage for some drivers such as docg4, but actually the Denali driver may pass maxchips=0 to nand_scan() when the driver is enabled but no NAND chip is found on the board for some reasons. If nand_scan_with_ids() is called with maxchips=0, nand_scan_ident() is skipped, then nand_set_defaults() is skipped as well. Thus, the driver must set chip->controller beforehand. Otherwise, nand_attach() causes NULL pointer dereference. In fact, the Denali controller knows the number of connected chips before calling nand_scan_ident(); if DEVICE_RESET fails, there is no chip in that chip select. Then, denali_reset_banks() sets the maxchips to the number of detected chips. If no chip is found, maxchips is zero. In this case, there is no point for calling nand_scan() because we know it will fail for sure. Let's make the probe function fail immediately. Fixes: 49aa76b166 ("mtd: rawnand: do not execute nand_scan_ident() if maxchips is zero") Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>		2018-08-27 20:41:46 +02:00
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chips	NAND core changes:	2018-08-11 12:15:19 +02:00
devices	spi: Updates for v4.19	2018-08-14 12:01:08 -07:00
lpddr	…
maps	…
nand	mtd: rawnand: denali: do not pass zero maxchips to nand_scan()	2018-08-27 20:41:46 +02:00
parsers	…
spi-nor	JFFS2 changes:	2018-08-14 10:57:44 -07:00
tests	…
ubi	ubi: expose the volume CRC check skip flag	2018-08-15 00:25:21 +02:00
Kconfig	…
Makefile	…
afs.c	…
ar7part.c	…
bcm47xxpart.c	…
bcm63xxpart.c	…
cmdlinepart.c	…
ftl.c	…
inftlcore.c	…
inftlmount.c	…
mtd_blkdevs.c	…
mtdblock.c	…
mtdblock_ro.c	…
mtdchar.c	…
mtdconcat.c	…
mtdcore.c	…
mtdcore.h	…
mtdoops.c	…
mtdpart.c	…
mtdsuper.c	…
mtdswap.c	…
nftlcore.c	…
nftlmount.c	…
ofpart.c	…
redboot.c	…
rfd_ftl.c	…
sm_ftl.c	…
sm_ftl.h	…
ssfdc.c	…