[PATCH 1/3] drm/msm/hdmi: Prevent gpio_free related kernel warnings

[Archit Taneja <architt@codeaurora.org>]

Calling the legacy gpio_free on an invalid GPIO (a GPIO numbered -1)
results in kernel warnings. This causes a lot of backtraces when
we try to unload the drm/msm module.

Call gpio_free only on valid GPIOs.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
---
 drivers/gpu/drm/msm/hdmi/hdmi_connector.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
index 26129bf..ce86117 100644
--- a/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
+++ b/drivers/gpu/drm/msm/hdmi/hdmi_connector.c
@@ -112,13 +112,16 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 		for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
 			struct hdmi_gpio_data gpio = config->gpios[i];
 
-			if (gpio.output) {
-				int value = gpio.value ? 0 : 1;
+			if (gpio.num != -1) {
+				if (gpio.output) {
+					int value = gpio.value ? 0 : 1;
 
-				gpio_set_value_cansleep(gpio.num, value);
-			}
+					gpio_set_value_cansleep(gpio.num,
+								value);
+				}
 
-			gpio_free(gpio.num);
+				gpio_free(gpio.num);
+			}
 		};
 
 		DBG("gpio off");
@@ -126,8 +129,10 @@ static int gpio_config(struct hdmi *hdmi, bool on)
 
 	return 0;
 err:
-	while (i--)
-		gpio_free(config->gpios[i].num);
+	while (i--) {
+		if (config->gpios[i].num != -1)
+			gpio_free(config->gpios[i].num);
+	}
 
 	return ret;
 }
-- 
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