From: Boris Brezillon boris.brezillon@collabora.com
commit e45a4b652dbd2f8b5a3b8e97e89f602a58cb28aa upstream.
Mimic what's done in nand_soft_waitrdy() and add one to the jiffies timeout so we don't end up waiting less than actually required.
Reported-by: Tudor Ambarus tudor.ambarus@microchip.com Fixes: b0e137ad24b6c ("mtd: rawnand: Provide helper for polling GPIO R/B pin") Cc: stable@vger.kernel.org Signed-off-by: Boris Brezillon boris.brezillon@collabora.com Reviewed-by: Tudor Ambarus tudor.ambarus@microchip.com Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/20200518155237.297549-1-boris.brezillon@co... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mtd/nand/raw/nand_base.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
--- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -731,8 +731,14 @@ EXPORT_SYMBOL_GPL(nand_soft_waitrdy); int nand_gpio_waitrdy(struct nand_chip *chip, struct gpio_desc *gpiod, unsigned long timeout_ms) { - /* Wait until R/B pin indicates chip is ready or timeout occurs */ - timeout_ms = jiffies + msecs_to_jiffies(timeout_ms); + + /* + * Wait until R/B pin indicates chip is ready or timeout occurs. + * +1 below is necessary because if we are now in the last fraction + * of jiffy and msecs_to_jiffies is 1 then we will wait only that + * small jiffy fraction - possibly leading to false timeout. + */ + timeout_ms = jiffies + msecs_to_jiffies(timeout_ms) + 1; do { if (gpiod_get_value_cansleep(gpiod)) return 0;