From: Arnd Bergmann Date: Fri, 22 May 2015 11:06:35 +0000 (+0200) Subject: usb: renesas_usbhs: avoid uninitialized variable use X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=672bfdaa310004368a0d493478e2a40f2f2f914f;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git usb: renesas_usbhs: avoid uninitialized variable use After the renesas_usbhs driver is enabled in ARM multi_v7_defconfig, we now get a new warning: renesas_usbhs/mod.c: In function 'usbhs_interrupt': renesas_usbhs/mod.c:246:7: warning: 'intenb1' may be used uninitialized in this function [-Wmaybe-uninitialized] gcc correctly points to a problem here, for the case that the device is in host mode, we use the intenb1 variable without having assigned it first. The state->intsts1 has a similar problem, but gcc cannot know that. This avoids the problem by initializing both sides of the comparison to zero when we don't read them from the respective registers. Signed-off-by: Arnd Bergmann Fixes: 88a25e02f3 ("usb: renesas_usbhs: Add access control for INTSTS1 and INTENB1 register") Acked-by: Yoshihiro Shimoda Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/renesas_usbhs/mod.c b/drivers/usb/renesas_usbhs/mod.c index e5ce6e6d4f51..d4be5d594896 100644 --- a/drivers/usb/renesas_usbhs/mod.c +++ b/drivers/usb/renesas_usbhs/mod.c @@ -223,6 +223,8 @@ static int usbhs_status_get_each_irq(struct usbhs_priv *priv, if (usbhs_mod_is_host(priv)) { state->intsts1 = usbhs_read(priv, INTSTS1); intenb1 = usbhs_read(priv, INTENB1); + } else { + state->intsts1 = intenb1 = 0; } /* mask */