[PATCH] net: macb: Only call GPIO functions if there is a valid GPIO

GPIOlib will print warning messages if we call GPIO functions without a
valid GPIO. Change the code to avoid doing so.

Signed-off-by: Charles Keepax <redacted>
---
 drivers/net/ethernet/cadence/macb.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 6619178..71bb42e 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c

@@ -2957,9 +2957,10 @@ static int macb_probe(struct platform_device *pdev)
 	phy_node =  of_get_next_available_child(np, NULL);
 	if (phy_node) {
 		int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0);
-		if (gpio_is_valid(gpio))
+		if (gpio_is_valid(gpio)) {
 			bp->reset_gpio = gpio_to_desc(gpio);
-		gpiod_direction_output(bp->reset_gpio, 1);
+			gpiod_direction_output(bp->reset_gpio, 1);
+		}
 	}
 	of_node_put(phy_node);
 

@@ -3029,7 +3030,8 @@ static int macb_remove(struct platform_device *pdev)
 		mdiobus_free(bp->mii_bus);
 
 		/* Shutdown the PHY if there is a GPIO reset */
-		gpiod_set_value(bp->reset_gpio, 0);
+		if (bp->reset_gpio)
+			gpiod_set_value(bp->reset_gpio, 0);
 
 		unregister_netdev(dev);
 		clk_disable_unprepare(bp->tx_clk);

-- 
2.1.4

From: Charles Keepax <redacted>
Date: Mon, 28 Mar 2016 13:47:42 +0100

GPIOlib will print warning messages if we call GPIO functions without a
valid GPIO. Change the code to avoid doing so.

Signed-off-by: Charles Keepax <redacted>

Applied.

Hello.

On 03/28/2016 03:47 PM, Charles Keepax wrote:

    Oops, sorry for missing this while fixing this code.

    Hm, this function was previously OK to call with NULL (it didn't curse)...

  		unregister_netdev(dev);
  		clk_disable_unprepare(bp->tx_clk);

MBR, Sergei

On Mon, Mar 28, 2016 at 08:30:11PM +0300, Sergei Shtylyov wrote:

quoted

@@ -3029,7 +3030,8 @@ static int macb_remove(struct platform_device *pdev)
 		mdiobus_free(bp->mii_bus);

 		/* Shutdown the PHY if there is a GPIO reset */
-		gpiod_set_value(bp->reset_gpio, 0);
+		if (bp->reset_gpio)
+			gpiod_set_value(bp->reset_gpio, 0);

   Hm, this function was previously OK to call with NULL (it didn't curse)...

Looks like it was changed so that it does complain fairly
recently (patch librally snipped down):

commit fdeb8e1547cb9dd39d5d7223b33f3565cf86c28e
Author: Linus Walleij [off-list ref]

    gpio: reflect base and ngpio into gpio_device


+#define VALIDATE_DESC_VOID(desc) do { \
+ if (!desc || !desc->gdev) { \
+         pr_warn("%s: invalid GPIO\n", __func__); \
+         return; \
+ } \
+

void gpiod_set_value(struct gpio_desc *desc, int value)
{
-   if (!desc)
-           return;
+ VALIDATE_DESC_VOID(desc);

Thanks,
Charles