Messages in this thread Patch in this message | | | Date | Sun, 28 Oct 2012 23:15:41 +0000 | From | Ben Hutchings <> | Subject | [ 005/105] mtd: nand: allow NAND_NO_SUBPAGE_WRITE to be set from driver |
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3.2-stable review patch. If anyone has any objections, please let me know.
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From: Brian Norris <computersforpeace@gmail.com>
commit bf7a01bf7987b63b121d572b240c132ec44129c4 upstream.
The NAND_CHIPOPTIONS_MSK has limited utility and is causing real bugs. It silently masks off at least one flag that might be set by the driver (NAND_NO_SUBPAGE_WRITE). This breaks the GPMI NAND driver and possibly others.
Really, as long as driver writers exercise a small amount of care with NAND_* options, this mask is not necessary at all; it was only here to prevent certain options from accidentally being set by the driver. But the original thought turns out to be a bad idea occasionally. Thus, kill it.
Note, this patch fixes some major gpmi-nand breakage.
Signed-off-by: Brian Norris <computersforpeace@gmail.com> Tested-by: Huang Shijie <shijie8@gmail.com> Cc: stable@vger.kernel.org Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> [Brian Norris: This is a backport for v3.2 stable.] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- drivers/mtd/nand/nand_base.c | 9 +++------ include/linux/mtd/nand.h | 3 --- 2 files changed, 3 insertions(+), 9 deletions(-)
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 3ed9c5e..daed698 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -2903,9 +2903,7 @@ static int nand_flash_detect_onfi(struct mtd_info *mtd, struct nand_chip *chip, if (le16_to_cpu(p->features) & 1) *busw = NAND_BUSWIDTH_16; - chip->options &= ~NAND_CHIPOPTIONS_MSK; - chip->options |= (NAND_NO_READRDY | - NAND_NO_AUTOINCR) & NAND_CHIPOPTIONS_MSK; + chip->options |= NAND_NO_READRDY | NAND_NO_AUTOINCR; return 1; } @@ -3069,9 +3067,8 @@ static struct nand_flash_dev *nand_get_flash_type(struct mtd_info *mtd, mtd->erasesize <<= ((id_data[3] & 0x03) << 1); } } - /* Get chip options, preserve non chip based options */ - chip->options &= ~NAND_CHIPOPTIONS_MSK; - chip->options |= type->options & NAND_CHIPOPTIONS_MSK; + /* Get chip options */ + chip->options |= type->options; /* * Check if chip is not a Samsung device. Do not clear the diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 904131b..b25b09b 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -215,9 +215,6 @@ typedef enum { #define NAND_SUBPAGE_READ(chip) ((chip->ecc.mode == NAND_ECC_SOFT) \ && (chip->page_shift > 9)) -/* Mask to zero out the chip options, which come from the id table */ -#define NAND_CHIPOPTIONS_MSK (0x0000ffff & ~NAND_NO_AUTOINCR) - /* Non chip related options */ /* This option skips the bbt scan during initialization. */ #define NAND_SKIP_BBTSCAN 0x00010000
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