linux-kernel - [PATCH] mfd: sprd-sc27xx-spi: Fix-up bogus IRQ register offset and mask setting

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Date:   Wed, 1 Jul 2020 10:15:18 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
Cc:     johan@...nel.org
Subject: [PATCH] mfd: sprd-sc27xx-spi: Fix-up bogus IRQ register offset and
 mask setting

'i / pdata->num_irqs' always equates to 0 and 'BIT(i % pdata->num_irqs)'
always ends up being BIT(i) here, so make that clearer in the code.  If
the code base needs to support more than 32 IRQs in the future, this will
have to be reworked, but lets just keep it simple for as long as we can.

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@...il.com>
Cc: Chunyan Zhang <zhang.lyra@...il.com>
Cc: Johan Hovold <johan@...nel.org>
Suggested-by: Baolin Wang <baolin.wang7@...il.com>
Signed-off-by: Lee Jones <lee.jones@...aro.org>

diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c
index c305e941e435c..4a1a61e1a86ea 100644
--- a/drivers/mfd/sprd-sc27xx-spi.c
+++ b/drivers/mfd/sprd-sc27xx-spi.c
@@ -251,10 +251,8 @@ 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++) {
-               ddata->irqs[i].reg_offset = i / pdata->num_irqs;
-               ddata->irqs[i].mask = BIT(i % pdata->num_irqs);
-       }
+       for (i = 0; i < pdata->num_irqs; i++)
+               ddata->irqs[i].mask = BIT(i);
 
        ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
                                       IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,