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From: Sergey Shtylyov <s.shtylyov@omprussia.ru>
To: <linux-i2c@vger.kernel.org>,
	Wolfram Sang <wsa+renesas@sang-engineering.com>
Cc: <linux-renesas-soc@vger.kernel.org>
Subject: [PATCH v2 5/6] i2c: rcar: add IRQ check
Date: Sat, 10 Apr 2021 23:23:33 +0300
Message-ID: <a4d29315-d7fc-88f2-ce6c-08e88874a5b7@omprussia.ru> (raw)
In-Reply-To: <7995bba1-61dd-baa3-51ea-0fb2fccc19a0@omprussia.ru>

The driver neglects to check the result of platform_get_irq()'s call and
blithely passes the negative error codes to devm_request_irq() (which
takes *unsigned* IRQ #), causing it to fail with -EINVAL, overriding
an original error code.  Stop calling devm_request_irq() with the
invalid IRQ #s.

Fixes: 6ccbe607132b ("i2c: add Renesas R-Car I2C driver")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

---
Changes in version 2:
- avoided a string of assignements;
- added Geert's tag.

 drivers/i2c/busses/i2c-rcar.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux/drivers/i2c/busses/i2c-rcar.c
===================================================================
--- linux.orig/drivers/i2c/busses/i2c-rcar.c
+++ linux/drivers/i2c/busses/i2c-rcar.c
@@ -1027,7 +1027,10 @@ static int rcar_i2c_probe(struct platfor
 	if (of_property_read_bool(dev->of_node, "smbus"))
 		priv->flags |= ID_P_HOST_NOTIFY;
 
-	priv->irq = platform_get_irq(pdev, 0);
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		goto out_pm_disable;
+	priv->irq = ret;
 	ret = devm_request_irq(dev, priv->irq, irqhandler, irqflags, dev_name(dev), priv);
 	if (ret < 0) {
 		dev_err(dev, "cannot get irq %d\n", priv->irq);

  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-10 20:11 [PATCH v2 0/6] Stop calling devm_request_irq() with invalid IRQs in the I2C bus drivers Sergey Shtylyov
2021-04-10 20:14 ` [PATCH v2 1/6] i2c: cadence: add IRQ check Sergey Shtylyov
2021-04-10 20:16 ` [PATCH v2 2/6] i2c: emev2: " Sergey Shtylyov
2021-04-10 20:18 ` [PATCH v2 3/6] i2c: jz4780: " Sergey Shtylyov
2021-04-10 20:20 ` [PATCH v2 4/6] i2c: mlxbf: " Sergey Shtylyov
2021-04-10 20:23 ` Sergey Shtylyov [this message]
2021-04-10 20:25 ` [PATCH v2 6/6] i2c: sh7760: " Sergey Shtylyov
2021-04-15 15:52   ` Sergey Shtylyov
2021-04-15 19:57     ` Wolfram Sang
2021-04-10 20:31 ` [PATCH v2 0/6] Stop calling devm_request_irq() with invalid IRQs in the I2C bus drivers Sergey Shtylyov
2021-04-10 20:57 ` Sergey Shtylyov
2021-04-14  8:22 ` Wolfram Sang
2021-04-17 19:05 ` [PATCH] i2c: sh7760: fix IRQ error path Sergey Shtylyov
2021-04-17 20:01   ` Wolfram Sang

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