[PATCH 4/5] mfd: sprd-sc27xx-spi: Fix divide by zero when allocating register offset/mask

Lee Jones
2020-06-29T18:53:26Z

Since ddata->irqs[] is already zeroed when allocated by devm_kcalloc() and
dividing 0 by anything is still 0, there is no need to re-assign
ddata->irqs[i].* values. Instead, it should be safe to begin at 1.

This fixes the following W=1 warning:

drivers/mfd/sprd-sc27xx-spi.c:255 sprd_pmic_probe() debug: sval_binop_unsigned: divide by zero

Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Baolin Wang <baolin.wang7@gmail.com>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mfd/sprd-sc27xx-spi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
index c305e941e435c..694a7d429ccff 100644
--- a/drivers/mfd/sprd-sc27xx-spi.c
+++ b/drivers/mfd/sprd-sc27xx-spi.c
@@ -251,7 +251,7 @@ static int sprd_pmic_probe(struct spi_device *spi)
return -ENOMEM;

ddata->irq_chip.irqs = ddata->irqs;
- for (i = 0; i < pdata->num_irqs; i++) {
+ for (i = 1; i < pdata->num_irqs; i++) {
ddata->irqs[i].reg_offset = i / pdata->num_irqs;
ddata->irqs[i].mask = BIT(i % pdata->num_irqs);
}
--
2.25.1