[PATCH] USB: convert a bunch of USB semaphores to mutexes
the patch below converts a bunch of semaphores-used-as-mutex in the USB
code to mutexes
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 97bdeb1..6dd339f 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 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 @@
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 @@
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 @@
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 @@
} 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 @@
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 @@
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);
diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c
index d34848a..48dee4b8 100644
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -55,6 +55,7 @@
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/lp.h>
+#include <linux/mutex.h>
#undef DEBUG
#include <linux/usb.h>
@@ -223,7 +224,7 @@
/* forward reference to make our lives easier */
static struct usb_driver usblp_driver;
-static DECLARE_MUTEX(usblp_sem); /* locks the existence of usblp's */
+static DEFINE_MUTEX(usblp_mutex); /* locks the existence of usblp's */
/*
* Functions for usblp control messages.
@@ -351,7 +352,7 @@
if (minor < 0)
return -ENODEV;
- down (&usblp_sem);
+ mutex_lock (&usblp_mutex);
retval = -ENODEV;
intf = usb_find_interface(&usblp_driver, minor);
@@ -399,7 +400,7 @@
}
}
out:
- up (&usblp_sem);
+ mutex_unlock (&usblp_mutex);
return retval;
}
@@ -425,13 +426,13 @@
{
struct usblp *usblp = file->private_data;
- down (&usblp_sem);
+ mutex_lock (&usblp_mutex);
usblp->used = 0;
if (usblp->present) {
usblp_unlink_urbs(usblp);
} else /* finish cleanup from disconnect */
usblp_cleanup (usblp);
- up (&usblp_sem);
+ mutex_unlock (&usblp_mutex);
return 0;
}
@@ -1152,7 +1153,7 @@
device_remove_file(&intf->dev, &dev_attr_ieee1284_id);
- down (&usblp_sem);
+ mutex_lock (&usblp_mutex);
down (&usblp->sem);
usblp->present = 0;
usb_set_intfdata (intf, NULL);
@@ -1166,7 +1167,7 @@
if (!usblp->used)
usblp_cleanup (usblp);
- up (&usblp_sem);
+ mutex_unlock (&usblp_mutex);
}
static struct usb_device_id usblp_ids [] = {