kernel: add preliminary support for linux 3.3

[openwrt/svn-archive/archive.git] / target / linux / generic / patches-3.3 / 864-gpiommc_configfs_locking.patch

diff --git a/target/linux/generic/patches-3.3/864-gpiommc_configfs_locking.patch b/target/linux/generic/patches-3.3/864-gpiommc_configfs_locking.patch
new file mode 100644 (file)
index 0000000..d4201eb
--- /dev/null
+++ b/target/linux/generic/patches-3.3/864-gpiommc_configfs_locking.patch
@@ -0,0 +1,58 @@
+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);
+