i2c: jz4780: 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: ba92222ed63a ("i2c: jz4780: Add i2c bus controller driver for Ingenic JZ4780")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
index 8509c5f..331a4b5 100644 (file)
--- a/drivers/i2c/busses/i2c-jz4780.c
+++ b/drivers/i2c/busses/i2c-jz4780.c
@@ -825,7 +825,10 @@ static int jz4780_i2c_probe(struct platform_device *pdev)
 
        jz4780_i2c_writew(i2c, JZ4780_I2C_INTM, 0x0);
 
-       i2c->irq = platform_get_irq(pdev, 0);
+       ret = platform_get_irq(pdev, 0);
+       if (ret < 0)
+               goto err;
+       i2c->irq = ret;
        ret = devm_request_irq(&pdev->dev, i2c->irq, jz4780_i2c_irq, 0,
                               dev_name(&pdev->dev), i2c);
        if (ret)