diff options
Diffstat (limited to 'samples/kfifo/inttype-example.c')
| -rw-r--r-- | samples/kfifo/inttype-example.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/samples/kfifo/inttype-example.c b/samples/kfifo/inttype-example.c index 78977fc4a23f..e4f93317c5d0 100644 --- a/samples/kfifo/inttype-example.c +++ b/samples/kfifo/inttype-example.c @@ -22,10 +22,10 @@ #define PROC_FIFO "int-fifo" /* lock for procfs read access */ -static DEFINE_MUTEX(read_lock); +static DEFINE_MUTEX(read_access); /* lock for procfs write access */ -static DEFINE_MUTEX(write_lock); +static DEFINE_MUTEX(write_access); /* * define DYNAMIC in this example for a dynamically allocated fifo. @@ -109,14 +109,16 @@ static ssize_t fifo_write(struct file *file, const char __user *buf, int ret; unsigned int copied; - if (mutex_lock_interruptible(&write_lock)) + if (mutex_lock_interruptible(&write_access)) return -ERESTARTSYS; ret = kfifo_from_user(&test, buf, count, &copied); - mutex_unlock(&write_lock); + mutex_unlock(&write_access); + if (ret) + return ret; - return ret ? ret : copied; + return copied; } static ssize_t fifo_read(struct file *file, char __user *buf, @@ -125,14 +127,16 @@ static ssize_t fifo_read(struct file *file, char __user *buf, int ret; unsigned int copied; - if (mutex_lock_interruptible(&read_lock)) + if (mutex_lock_interruptible(&read_access)) return -ERESTARTSYS; ret = kfifo_to_user(&test, buf, count, &copied); - mutex_unlock(&read_lock); + mutex_unlock(&read_access); + if (ret) + return ret; - return ret ? ret : copied; + return copied; } static const struct proc_ops fifo_proc_ops = { @@ -178,5 +182,6 @@ static void __exit example_exit(void) module_init(example_init); module_exit(example_exit); +MODULE_DESCRIPTION("Sample kfifo int type implementation"); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Stefani Seibold <stefani@seibold.net>"); |