linux-kernel - [PATCH 3.12 072/100] gpio: pca953x: Fix NBANK calculation for PCA9536

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Date:   Fri, 19 Aug 2016 09:11:11 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Vignesh R <vigneshr@...com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 072/100] gpio: pca953x: Fix NBANK calculation for PCA9536

From: Vignesh R <vigneshr@...com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit a246b8198f776a16d1d3a3bbfc2d437bad766b29 upstream.

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().

Signed-off-by: Vignesh R <vigneshr@...com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 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 cdd1aa12b895..7bb81d63cc3d 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -75,7 +75,7 @@ MODULE_DEVICE_TABLE(i2c, pca953x_id);
 #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;
-- 
2.9.3