From a246b8198f776a16d1d3a3bbfc2d437bad766b29 Mon Sep 17 00:00:00 2001 From: Vignesh R Date: Thu, 9 Jun 2016 11:02:04 +0530 Subject: [PATCH] gpio: pca953x: Fix NBANK calculation for PCA9536 NBANK() macro assumes that ngpios is a multiple of 8(BANK_SZ) and hence results in 0 banks for PCA9536 which has just 4 gpios. This is wrong as PCA9356 has 1 bank with 4 gpios. This results in uninitialized PCA953X_INVERT register. Fix this by using DIV_ROUND_UP macro in NBANK(). Cc: stable@vger.kernel.org Signed-off-by: Vignesh R Signed-off-by: Linus Walleij --- drivers/gpio/gpio-pca953x.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 21b21cd1773b..3969cc014acd 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -90,7 +90,7 @@ MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids); #define MAX_BANK 5 #define BANK_SZ 8 -#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ) +#define NBANK(chip) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ) struct pca953x_chip { unsigned gpio_start;