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pinctrl: single: check function mask to be non-zero

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Otherwise it can generate a division by zero, which has an undefined
behavior.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
This commit is contained in:
Dario Binacchi 2021-04-22 18:35:58 +02:00 committed by Tom Rini
parent 7ac7038ab3
commit 69414d86ed
1 changed files with 9 additions and 0 deletions
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9
drivers/pinctrl/pinctrl-single.c
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@ -335,6 +335,10 @@ static int single_configure_bits(struct udevice *dev,
phys_addr_t reg;
u32 offset, val, mask, bit_pos, val_pos, mask_pos, submask;
/* If function mask is null, needn't enable it. */
if (!pdata->mask)
return 0;
npins_in_reg = pdata->width / priv->bits_per_pin;
func = single_allocate_function(dev, count * npins_in_reg);
if (IS_ERR(func))
@ -469,6 +473,11 @@ static int single_probe(struct udevice *dev)
priv->npins = size / (pdata->width / BITS_PER_BYTE);
if (pdata->bits_per_mux) {
if (!pdata->mask) {
dev_err(dev, "function mask needs to be non-zero\n");
return -EINVAL;
}
priv->bits_per_pin = fls(pdata->mask);
priv->npins *= (pdata->width / priv->bits_per_pin);
}