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usb: renesas_usbhs: avoid uninitialized variable use

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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 <arnd@arndb.de>
Fixes: 88a25e02f3 ("usb: renesas_usbhs: Add access control for INTSTS1 and INTENB1 register")
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Arnd Bergmann 2015-05-22 13:06:35 +02:00 committed by Felipe Balbi
parent 81dff86928
commit 672bfdaa31
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/renesas_usbhs/mod.c
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@ -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 */