i2c: emev2: add IRQ check

[ Upstream commit bb6129c32867baa7988f7fd2066cf18ed662d240 ]

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 invalid
IRQ #s.

Fixes: 5faf6e1f58b4 ("i2c: emev2: add driver")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i2c/busses/i2c-emev2.c b/drivers/i2c/busses/i2c-emev2.c
index 0218ba6eb26ab02e5b24cc792cd2837e124f2f45..ad33c1e3a30fef0b8ff9fac19a2d21473c3c60b5 100644 (file)
--- a/drivers/i2c/busses/i2c-emev2.c
+++ b/drivers/i2c/busses/i2c-emev2.c
@@ -398,7 +398,10 @@ static int em_i2c_probe(struct platform_device *pdev)
 
        em_i2c_reset(&priv->adap);
 
-       priv->irq = platform_get_irq(pdev, 0);
+       ret = platform_get_irq(pdev, 0);
+       if (ret < 0)
+               goto err_clk;
+       priv->irq = ret;
        ret = devm_request_irq(&pdev->dev, priv->irq, em_i2c_irq_handler, 0,
                                "em_i2c", priv);
        if (ret)