diff options
| -rw-r--r-- | target/linux/generic-2.6/patches-2.6.25/923-gpiommc-configfs-locking.patch | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.25/923-gpiommc-configfs-locking.patch b/target/linux/generic-2.6/patches-2.6.25/923-gpiommc-configfs-locking.patch new file mode 100644 index 0000000000..79a4acb509 --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.25/923-gpiommc-configfs-locking.patch @@ -0,0 +1,60 @@ +The gpiommc configfs context structure needs locking, as configfs +does not lock access between files. + +Index: linux-2.6.25.10/drivers/mmc/host/gpiommc.c +=================================================================== +--- linux-2.6.25.10.orig/drivers/mmc/host/gpiommc.c 2008-07-21 11:57:01.000000000 +0200 ++++ linux-2.6.25.10/drivers/mmc/host/gpiommc.c 2008-07-21 12:01:33.000000000 +0200 +@@ -143,6 +143,8 @@ 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 +@@ -233,6 +235,8 @@ 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) +@@ -293,6 +297,8 @@ static ssize_t gpiommc_config_attr_show( + WARN_ON(1); + err = -ENOSYS; + out: ++ mutex_unlock(&dev->mutex); ++ + return err ? err : count; + } + +@@ -352,6 +358,8 @@ 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) +@@ -477,6 +485,8 @@ static ssize_t gpiommc_config_attr_store + WARN_ON(1); + err = -ENOSYS; + out: ++ mutex_unlock(&dev->mutex); ++ + return err ? err : count; + } + +@@ -513,6 +523,7 @@ 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); + |