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mirror of git://projects.qi-hardware.com/openwrt-xburst.git synced 2024-12-12 14:12:48 +02:00
openwrt-xburst/target/linux/generic-2.6/patches-2.6.25/923-gpiommc-configfs-locking.patch
juhosg 115a129a30 [kernel] update to 2.6.25.12
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11933 3c298f89-4303-0410-b956-a3cf2f4a3e73
2008-07-26 10:53:23 +00:00

59 lines
1.1 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
@@ -143,6 +143,8 @@
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 @@
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 @@
WARN_ON(1);
err = -ENOSYS;
out:
+ mutex_unlock(&dev->mutex);
+
return err ? err : count;
}
@@ -352,6 +358,8 @@
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 @@
WARN_ON(1);
err = -ENOSYS;
out:
+ mutex_unlock(&dev->mutex);
+
return err ? err : count;
}
@@ -513,6 +523,7 @@
if (!dev)
return NULL;
+ mutex_init(&dev->mutex);
config_item_init_type_name(&dev->item, name,
&gpiommc_dev_ci_type);