[PATCH 5.4 21/85] sfp: Fix error handing in sfp_probe()

[Greg Kroah-Hartman]

From: YueHaibing <yuehaib...@huawei.com>

[ Upstream commit 9621618130bf7e83635367c13b9a6ee53935bb37 ]

gpiod_to_irq() never return 0, but returns negative in
case of error, check it and set gpio_irq to 0.

Fixes: 73970055450e ("sfp: add SFP module support")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
Reviewed-by: Andrew Lunn <and...@lunn.ch>
Link: https://lore.kernel.org/r/20201031031053.25264-1-yuehaib...@huawei.com
Signed-off-by: Jakub Kicinski <k...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/phy/sfp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -1970,7 +1970,8 @@ static int sfp_probe(struct platform_dev
                        continue;
 
                sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]);
-               if (!sfp->gpio_irq[i]) {
+               if (sfp->gpio_irq[i] < 0) {
+                       sfp->gpio_irq[i] = 0;
                        poll = true;
                        continue;
                }