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Date: Wed, 23 Dec 2015 14:35:57 -0800 From: Ray Jui <rjui@...adcom.com> To: Andrzej Hajda <a.hajda@...sung.com>, Linus Walleij <linus.walleij@...aro.org>, Scott Branden <sbranden@...adcom.com>, Jon Mason <jonmason@...adcom.com> CC: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>, Marek Szyprowski <m.szyprowski@...sung.com>, "open list:PIN CONTROL SUBSYSTEM" <linux-gpio@...r.kernel.org>, "moderated list:BROADCOM IPROC ARM ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>, "open list:BROADCOM IPROC ARM ARCHITECTURE" <bcm-kernel-feedback-list@...adcom.com>, open list <linux-kernel@...r.kernel.org>, Yendapally Reddy Dhananjaya Reddy <yrdreddy@...adcom.com> Subject: Re: [PATCH] pinctrl: nsp-gpio: fix type of iterator + Reddy On 12/23/2015 2:37 AM, Andrzej Hajda wrote: > Iterator i declared as unsigned is always non-negative so the > loop will never end. > > The problem has been detected using proposed semantic patch > scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1]. > > [1]: http://permalink.gmane.org/gmane.linux.kernel/2038576 > > Signed-off-by: Andrzej Hajda <a.hajda@...sung.com> > --- > drivers/pinctrl/bcm/pinctrl-nsp-gpio.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c b/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c > index 34648f6..ad5b04c 100644 > --- a/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c > +++ b/drivers/pinctrl/bcm/pinctrl-nsp-gpio.c > @@ -439,7 +439,8 @@ static int nsp_gpio_set_strength(struct nsp_gpio *chip, unsigned gpio, > static int nsp_gpio_get_strength(struct nsp_gpio *chip, unsigned gpio, > u16 *strength) > { > - unsigned int i, offset, shift; > + unsigned int offset, shift; > + int i; > u32 val; > unsigned long flags; > > The fix is a valid fix. And at the same time it exposes other potential issues in the driver. I just found the loop used in _set_strength and _get_strength is inconsistent: In _set_strength: 427 for (i = GPIO_DRV_STRENGTH_BITS; i > 0; i--) { For i to start at GPIO_DRV_STRENGTH_BITS, it seems to be wrong. 428 val = readl(chip->io_ctrl + offset); 429 val &= ~BIT(shift); 430 val |= ((strength >> (i-1)) & 0x1) << shift; 431 writel(val, chip->io_ctrl + offset); 432 offset += 4; 433 } In _get_strength: 451 for (i = (GPIO_DRV_STRENGTH_BITS - 1); i >= 0; i--) { 452 val = readl(chip->io_ctrl + offset) & BIT(shift); 453 val >>= shift; 454 *strength += (val << i); 455 offset += 4; 456 } Reddy, could you please review and comment? Thanks, Ray -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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