Le 16/06/2022 à 17:19, Liang He a écrit :
In gpio_halt_probe(), of_find_matching_node() will return a node pointer with
refcount incremented. We should use of_node_put() in each fail path or when it
is not used anymore.
Signed-off-by: Liang He <win...@126.com>
---
changelog:
v2: use goto-label patch style advised by Christophe.
v1: add of_node_put() before each exit.
arch/powerpc/platforms/85xx/sgy_cts1000.c | 27 +++++++++++++++--------
1 file changed, 18 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/platforms/85xx/sgy_cts1000.c
b/arch/powerpc/platforms/85xx/sgy_cts1000.c
index 98ae64075193..e280f963d88c 100644
--- a/arch/powerpc/platforms/85xx/sgy_cts1000.c
+++ b/arch/powerpc/platforms/85xx/sgy_cts1000.c
@@ -73,6 +73,7 @@ static int gpio_halt_probe(struct platform_device *pdev)
struct device_node *node = pdev->dev.of_node;
int gpio, err, irq;
int trigger;
+ int ret;
if (!node)
return -ENODEV;
@@ -84,20 +85,24 @@ static int gpio_halt_probe(struct platform_device *pdev)
/* Technically we could just read the first one, but punish
* DT writers for invalid form. */
- if (of_gpio_count(halt_node) != 1)
- return -EINVAL;
+ if (of_gpio_count(halt_node) != 1) {
+ ret = -EINVAL;
+ goto err_put;
+ }
/* Get the gpio number relative to the dynamic base. */
gpio = of_get_gpio_flags(halt_node, 0, &flags);
- if (!gpio_is_valid(gpio))
- return -EINVAL;
+ if (!gpio_is_valid(gpio)) {
+ ret = -EINVAL;
+ gotot err_put;
+ }
err = gpio_request(gpio, "gpio-halt");
if (err) {
printk(KERN_ERR "gpio-halt: error requesting GPIO %d.\n",
gpio);
- halt_node = NULL;
- return err;
+ ret = err;
+ goto err_put;
}
trigger = (flags == OF_GPIO_ACTIVE_LOW);
@@ -112,8 +117,8 @@ static int gpio_halt_probe(struct platform_device *pdev)
printk(KERN_ERR "gpio-halt: error requesting IRQ %d for "
"GPIO %d.\n", irq, gpio);
gpio_free(gpio);
- halt_node = NULL;
- return err;
+ ret = err;
+ goto err_put;
}
/* Register our halt function */
@@ -122,8 +127,12 @@ static int gpio_halt_probe(struct platform_device *pdev)
printk(KERN_INFO "gpio-halt: registered GPIO %d (%d trigger, %d"
" irq).\n", gpio, trigger, irq);
+ ret = 0;
- return 0;
+err_put:
+ of_node_put(halt_node);
+ halt_node = NULL;
Hi,
so now we set 'halt_node' to NULL even in the normal case.
This is really spurious.
Look at gpio_halt_cb(), but I think that this is just wrong and badly
breaks this driver.
CJ
+ return ret;
}
static int gpio_halt_remove(struct platform_device *pdev)
