i2c: mlxbf: 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: b5b5b32081cd ("i2c: mlxbf: I2C SMBus driver for Mellanox BlueField SoC")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-mlxbf.c b/drivers/i2c/busses/i2c-mlxbf.c
index 80ab831..8716032 100644 (file)
--- a/drivers/i2c/busses/i2c-mlxbf.c
+++ b/drivers/i2c/busses/i2c-mlxbf.c
@@ -2370,6 +2370,8 @@ static int mlxbf_i2c_probe(struct platform_device *pdev)
        mlxbf_i2c_init_slave(pdev, priv);
 
        irq = platform_get_irq(pdev, 0);
+       if (irq < 0)
+               return irq;
        ret = devm_request_irq(dev, irq, mlxbf_smbus_irq,
                               IRQF_ONESHOT | IRQF_SHARED | IRQF_PROBE_SHARED,
                               dev_name(dev), priv);