59 lines
1.4 KiB
Diff
59 lines
1.4 KiB
Diff
The gpiommc configfs context structure needs locking, as configfs
|
|
does not lock access between files.
|
|
|
|
--- a/drivers/mmc/host/gpiommc.c
|
|
+++ b/drivers/mmc/host/gpiommc.c
|
|
@@ -144,6 +144,8 @@ struct gpiommc_configfs_device {
|
|
struct platform_device *pdev;
|
|
/* The configuration */
|
|
struct gpiommc_platform_data pdata;
|
|
+ /* Mutex to protect this structure */
|
|
+ struct mutex mutex;
|
|
};
|
|
|
|
#define GPIO_INVALID -1
|
|
@@ -234,6 +236,8 @@ static ssize_t gpiommc_config_attr_show(
|
|
unsigned int gpio;
|
|
int err = 0;
|
|
|
|
+ mutex_lock(&dev->mutex);
|
|
+
|
|
if (attr == &gpiommc_attr_DI) {
|
|
gpio = dev->pdata.pins.gpio_di;
|
|
if (gpio == GPIO_INVALID)
|
|
@@ -294,6 +298,8 @@ static ssize_t gpiommc_config_attr_show(
|
|
WARN_ON(1);
|
|
err = -ENOSYS;
|
|
out:
|
|
+ mutex_unlock(&dev->mutex);
|
|
+
|
|
return err ? err : count;
|
|
}
|
|
|
|
@@ -353,6 +359,8 @@ static ssize_t gpiommc_config_attr_store
|
|
int err = -EINVAL;
|
|
unsigned long data;
|
|
|
|
+ mutex_lock(&dev->mutex);
|
|
+
|
|
if (attr == &gpiommc_attr_register) {
|
|
err = strict_strtoul(page, 10, &data);
|
|
if (err)
|
|
@@ -478,6 +486,8 @@ static ssize_t gpiommc_config_attr_store
|
|
WARN_ON(1);
|
|
err = -ENOSYS;
|
|
out:
|
|
+ mutex_unlock(&dev->mutex);
|
|
+
|
|
return err ? err : count;
|
|
}
|
|
|
|
@@ -514,6 +524,7 @@ static struct config_item *gpiommc_make_
|
|
if (!dev)
|
|
return NULL;
|
|
|
|
+ mutex_init(&dev->mutex);
|
|
config_item_init_type_name(&dev->item, name,
|
|
&gpiommc_dev_ci_type);
|
|
|