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From: Lee Jones <lee.jones@linaro.org>
To: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Orson Zhai <orsonzhai@gmail.com>,
	Baolin Wang <baolin.wang7@gmail.com>,
	Chunyan Zhang <zhang.lyra@gmail.com>
Cc: johan@kernel.org
Subject: [PATCH] mfd: sprd-sc27xx-spi: Fix-up bogus IRQ register offset and mask setting
Date: Wed, 1 Jul 2020 10:15:18 +0100
Message-ID: <20200701091518.GW1179328@dell> (raw)
In-Reply-To: <20200629123215.1014747-5-lee.jones@linaro.org>

'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@gmail.com>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Cc: Johan Hovold <johan@kernel.org>
Suggested-by: Baolin Wang <baolin.wang7@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.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,

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  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 12:32 [PATCH 0/5] Last batch of W=1 warning fixes in MFD Lee Jones
2020-06-29 12:32 ` [PATCH 1/5] mfd: si476x-cmd: Add missing documentation for si476x_cmd_fm_rds_status()'s arg 'report' Lee Jones
2020-06-29 12:32 ` [PATCH 2/5] mfd: lm3533-ctrlbank: Cap BRIGHTNESS_MAX to 127 since API uses u8 as carrier Lee Jones
2020-06-29 12:51   ` Johan Hovold
2020-06-29 13:25     ` Lee Jones
2020-06-30  8:38       ` Johan Hovold
2020-06-29 12:32 ` [PATCH 3/5] mfd: rave-sp: Fix mistake in 'struct rave_sp_deframer's kerneldoc Lee Jones
2020-06-29 12:32 ` [PATCH 4/5] mfd: sprd-sc27xx-spi: Fix divide by zero when allocating register offset/mask Lee Jones
2020-06-29 13:06   ` Johan Hovold
2020-06-29 14:01     ` Lee Jones
2020-06-29 14:35       ` Baolin Wang
2020-06-29 14:43         ` Johan Hovold
2020-06-29 15:08           ` Baolin Wang
2020-06-29 15:45             ` Lee Jones
2020-07-01  9:15   ` Lee Jones [this message]
2020-07-01 14:10     ` [PATCH] mfd: sprd-sc27xx-spi: Fix-up bogus IRQ register offset and mask setting Baolin Wang
2020-06-29 12:32 ` [PATCH 5/5] mfd: axp20x-i2c: Do not define 'struct acpi_device_id' when !CONFIG_ACPI Lee Jones
2020-06-29 15:38   ` Chen-Yu Tsai
2020-07-06  7:31     ` Lee Jones
2020-07-01  6:59   ` [PATCH v2] mfd: axp20x-i2c: Tell the compiler that ACPI functions may not be used Lee Jones
2020-07-01  8:38     ` Chen-Yu Tsai

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