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path: root/drivers/usb/class/cdc-acm.c
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Diffstat (limited to 'drivers/usb/class/cdc-acm.c')
-rw-r--r--drivers/usb/class/cdc-acm.c23
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 97bdeb1c218..6dd339f4c0f 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -60,6 +60,7 @@
#include <linux/tty_flip.h>
#include <linux/module.h>
#include <linux/smp_lock.h>
+#include <linux/mutex.h>
#include <asm/uaccess.h>
#include <linux/usb.h>
#include <linux/usb_cdc.h>
@@ -80,7 +81,7 @@ static struct usb_driver acm_driver;
static struct tty_driver *acm_tty_driver;
static struct acm *acm_table[ACM_TTY_MINORS];
-static DECLARE_MUTEX(open_sem);
+static DEFINE_MUTEX(open_mutex);
#define ACM_READY(acm) (acm && acm->dev && acm->used)
@@ -431,8 +432,8 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
int rv = -EINVAL;
int i;
dbg("Entering acm_tty_open.\n");
-
- down(&open_sem);
+
+ mutex_lock(&open_mutex);
acm = acm_table[tty->index];
if (!acm || !acm->dev)
@@ -474,14 +475,14 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
done:
err_out:
- up(&open_sem);
+ mutex_unlock(&open_mutex);
return rv;
full_bailout:
usb_kill_urb(acm->ctrlurb);
bail_out:
acm->used--;
- up(&open_sem);
+ mutex_unlock(&open_mutex);
return -EIO;
}
@@ -507,7 +508,7 @@ static void acm_tty_close(struct tty_struct *tty, struct file *filp)
if (!acm || !acm->used)
return;
- down(&open_sem);
+ mutex_lock(&open_mutex);
if (!--acm->used) {
if (acm->dev) {
acm_set_control(acm, acm->ctrlout = 0);
@@ -518,7 +519,7 @@ static void acm_tty_close(struct tty_struct *tty, struct file *filp)
} else
acm_tty_unregister(acm);
}
- up(&open_sem);
+ mutex_unlock(&open_mutex);
}
static int acm_tty_write(struct tty_struct *tty, const unsigned char *buf, int count)
@@ -1013,9 +1014,9 @@ static void acm_disconnect(struct usb_interface *intf)
return;
}
- down(&open_sem);
+ mutex_lock(&open_mutex);
if (!usb_get_intfdata(intf)) {
- up(&open_sem);
+ mutex_unlock(&open_mutex);
return;
}
acm->dev = NULL;
@@ -1045,11 +1046,11 @@ static void acm_disconnect(struct usb_interface *intf)
if (!acm->used) {
acm_tty_unregister(acm);
- up(&open_sem);
+ mutex_unlock(&open_mutex);
return;
}
- up(&open_sem);
+ mutex_unlock(&open_mutex);
if (acm->tty)
tty_hangup(acm->tty);