| 1 | The gpiommc configfs context structure needs locking, as configfs |
| 2 | does not lock access between files. |
| 3 | |
| 4 | --- a/drivers/mmc/host/gpiommc.c |
| 5 | +++ b/drivers/mmc/host/gpiommc.c |
| 6 | @@ -143,6 +143,8 @@ struct gpiommc_configfs_device { |
| 7 | struct platform_device *pdev; |
| 8 | /* The configuration */ |
| 9 | struct gpiommc_platform_data pdata; |
| 10 | + /* Mutex to protect this structure */ |
| 11 | + struct mutex mutex; |
| 12 | }; |
| 13 | |
| 14 | #define GPIO_INVALID -1 |
| 15 | @@ -233,6 +235,8 @@ static ssize_t gpiommc_config_attr_show( |
| 16 | unsigned int gpio; |
| 17 | int err = 0; |
| 18 | |
| 19 | + mutex_lock(&dev->mutex); |
| 20 | + |
| 21 | if (attr == &gpiommc_attr_DI) { |
| 22 | gpio = dev->pdata.pins.gpio_di; |
| 23 | if (gpio == GPIO_INVALID) |
| 24 | @@ -293,6 +297,8 @@ static ssize_t gpiommc_config_attr_show( |
| 25 | WARN_ON(1); |
| 26 | err = -ENOSYS; |
| 27 | out: |
| 28 | + mutex_unlock(&dev->mutex); |
| 29 | + |
| 30 | return err ? err : count; |
| 31 | } |
| 32 | |
| 33 | @@ -352,6 +358,8 @@ static ssize_t gpiommc_config_attr_store |
| 34 | int err = -EINVAL; |
| 35 | unsigned long data; |
| 36 | |
| 37 | + mutex_lock(&dev->mutex); |
| 38 | + |
| 39 | if (attr == &gpiommc_attr_register) { |
| 40 | err = strict_strtoul(page, 10, &data); |
| 41 | if (err) |
| 42 | @@ -477,6 +485,8 @@ static ssize_t gpiommc_config_attr_store |
| 43 | WARN_ON(1); |
| 44 | err = -ENOSYS; |
| 45 | out: |
| 46 | + mutex_unlock(&dev->mutex); |
| 47 | + |
| 48 | return err ? err : count; |
| 49 | } |
| 50 | |
| 51 | @@ -513,6 +523,7 @@ static struct config_item *gpiommc_make_ |
| 52 | if (!dev) |
| 53 | return NULL; |
| 54 | |
| 55 | + mutex_init(&dev->mutex); |
| 56 | config_item_init_type_name(&dev->item, name, |
| 57 | &gpiommc_dev_ci_type); |
| 58 | |
| 59 | |
