i2c: sh7760: add IRQ check

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: a26c20b1fa6d ("i2c: Renesas SH7760 I2C master driver")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-sh7760.c b/drivers/i2c/busses/i2c-sh7760.c
index c2005c789d2b09b8429368599d93683c5342b364..c79c9f542c5ab9ac00ec7ed6b7e4140ad6d486d7 100644 (file)
--- a/drivers/i2c/busses/i2c-sh7760.c
+++ b/drivers/i2c/busses/i2c-sh7760.c
@@ -471,7 +471,10 @@ static int sh7760_i2c_probe(struct platform_device *pdev)
                goto out2;
        }
 
-       id->irq = platform_get_irq(pdev, 0);
+       ret = platform_get_irq(pdev, 0);
+       if (ret < 0)
+               return ret;
+       id->irq = ret;
 
        id->adap.nr = pdev->id;
        id->adap.algo = &sh7760_i2c_algo;