[PATCH 5.11 502/601] i2c: rcar: add IRQ check

Greg Kroah-Hartman
2021-05-12T17:56:32Z

From: Sergey Shtylyov <s.shtylyov@omprussia.ru>

[ Upstream commit 147178cf03a6dcb337e703d4dacd008683022a58 ]

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>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/i2c/busses/i2c-rcar.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 12f6d452c0f7..8722ca23f889 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -1027,7 +1027,10 @@ static int rcar_i2c_probe(struct platform_device *pdev)
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);
--
2.30.2