diff options
Diffstat (limited to 'drivers/telephony')
-rw-r--r-- | drivers/telephony/phonedev.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/telephony/phonedev.c b/drivers/telephony/phonedev.c index 3c987f4..e166fff 100644 --- a/drivers/telephony/phonedev.c +++ b/drivers/telephony/phonedev.c @@ -29,6 +29,7 @@ #include <linux/kmod.h> #include <linux/sem.h> #include <linux/devfs_fs_kernel.h> +#include <linux/mutex.h> #define PHONE_NUM_DEVICES 256 @@ -37,7 +38,7 @@ */ static struct phone_device *phone_device[PHONE_NUM_DEVICES]; -static DECLARE_MUTEX(phone_lock); +static DEFINE_MUTEX(phone_lock); /* * Open a phone device. @@ -48,19 +49,19 @@ static int phone_open(struct inode *inode, struct file *file) unsigned int minor = iminor(inode); int err = 0; struct phone_device *p; - struct file_operations *old_fops, *new_fops = NULL; + const struct file_operations *old_fops, *new_fops = NULL; if (minor >= PHONE_NUM_DEVICES) return -ENODEV; - down(&phone_lock); + mutex_lock(&phone_lock); p = phone_device[minor]; if (p) new_fops = fops_get(p->f_op); if (!new_fops) { - up(&phone_lock); + mutex_unlock(&phone_lock); request_module("char-major-%d-%d", PHONE_MAJOR, minor); - down(&phone_lock); + mutex_lock(&phone_lock); p = phone_device[minor]; if (p == NULL || (new_fops = fops_get(p->f_op)) == NULL) { @@ -78,7 +79,7 @@ static int phone_open(struct inode *inode, struct file *file) } fops_put(old_fops); end: - up(&phone_lock); + mutex_unlock(&phone_lock); return err; } @@ -100,18 +101,18 @@ int phone_register_device(struct phone_device *p, int unit) end = unit + 1; /* enter the loop at least one time */ } - down(&phone_lock); + mutex_lock(&phone_lock); for (i = base; i < end; i++) { if (phone_device[i] == NULL) { phone_device[i] = p; p->minor = i; devfs_mk_cdev(MKDEV(PHONE_MAJOR,i), S_IFCHR|S_IRUSR|S_IWUSR, "phone/%d", i); - up(&phone_lock); + mutex_unlock(&phone_lock); return 0; } } - up(&phone_lock); + mutex_unlock(&phone_lock); return -ENFILE; } @@ -121,12 +122,12 @@ int phone_register_device(struct phone_device *p, int unit) void phone_unregister_device(struct phone_device *pfd) { - down(&phone_lock); + mutex_lock(&phone_lock); if (phone_device[pfd->minor] != pfd) panic("phone: bad unregister"); devfs_remove("phone/%d", pfd->minor); phone_device[pfd->minor] = NULL; - up(&phone_lock); + mutex_unlock(&phone_lock); } |