diff options
Diffstat (limited to 'drivers/char/generic_nvram.c')
| -rw-r--r-- | drivers/char/generic_nvram.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/char/generic_nvram.c b/drivers/char/generic_nvram.c index fda4181b5e6..6c4f4b5a9dd 100644 --- a/drivers/char/generic_nvram.c +++ b/drivers/char/generic_nvram.c @@ -19,6 +19,7 @@ #include <linux/miscdevice.h> #include <linux/fcntl.h> #include <linux/init.h> +#include <linux/mutex.h> #include <asm/uaccess.h> #include <asm/nvram.h> #ifdef CONFIG_PPC_PMAC @@ -27,17 +28,22 @@ #define NVRAM_SIZE 8192 +static DEFINE_MUTEX(nvram_mutex); static ssize_t nvram_len; static loff_t nvram_llseek(struct file *file, loff_t offset, int origin) { switch (origin) { + case 0: + break; case 1: offset += file->f_pos; break; case 2: offset += nvram_len; break; + default: + offset = -1; } if (offset < 0) return -EINVAL; @@ -84,8 +90,7 @@ static ssize_t write_nvram(struct file *file, const char __user *buf, return p - buf; } -static int nvram_ioctl(struct inode *inode, struct file *file, - unsigned int cmd, unsigned long arg) +static int nvram_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { switch(cmd) { #ifdef CONFIG_PPC_PMAC @@ -116,12 +121,23 @@ static int nvram_ioctl(struct inode *inode, struct file *file, return 0; } +static long nvram_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + int ret; + + mutex_lock(&nvram_mutex); + ret = nvram_ioctl(file, cmd, arg); + mutex_unlock(&nvram_mutex); + + return ret; +} + const struct file_operations nvram_fops = { .owner = THIS_MODULE, .llseek = nvram_llseek, .read = read_nvram, .write = write_nvram, - .ioctl = nvram_ioctl, + .unlocked_ioctl = nvram_unlocked_ioctl, }; static struct miscdevice nvram_dev = { |