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