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mailbox: imx: Avoid using val uninitialized in imx_mu_isr() 

Clang warns:

drivers/mailbox/imx-mailbox.c:284:2: warning: variable 'val' is used
uninitialized whenever switch default is taken
[-Wsometimes-uninitialized]
        default:
        ^~~~~~~
drivers/mailbox/imx-mailbox.c:288:7: note: uninitialized use occurs here
        if (!val)
             ^~~
drivers/mailbox/imx-mailbox.c:263:9: note: initialize the variable 'val'
to silence this warning
        u32 val, ctrl;
               ^
                = 0
1 warning generated.

Prior to commit 91c8c1fbe498 ("mailbox: imx: add xSR/xCR register
array"), val was always initialized in imx_mu_isr() but now, it is not
initialized in the default case. Return IRQ_NONE like the statement
below does and add a message that there is an unhandled type for this
switch statement so that it can be updated.

Fixes: 91c8c1fbe498 ("mailbox: imx: add xSR/xCR register array")
Link: https://github.com/ClangBuiltLinux/linux/issues/1404
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Nathan Chancellor 2021-06-21 11:56:45 -07:00 committed by Jassi Brar
parent 8a7cdb108d
commit e80a7e7eaf
1 changed files with 3 additions and 1 deletions
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4
drivers/mailbox/imx-mailbox.c
View File

@ -282,7 +282,9 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
(ctrl & IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
break;
default:
break;
dev_warn_ratelimited(priv->dev, "Unhandled channel type %d\n",
cp->type);
return IRQ_NONE;
}
if (!val)