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USB: auerswald: Convert ccp->readmutex in a mutex

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The semaphore ccp->readmutex is used as mutex, convert it to the mutex API

Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net>
Cc: Wolfgang Mües <wolfgang@iksw-muees.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
matthias@kaehlcke.net 2008-02-18 20:45:35 +01:00 committed by Greg Kroah-Hartman
parent b994d7f70a
commit 8a0f46b92f
1 changed files with 9 additions and 9 deletions
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18
drivers/usb/misc/auerswald.c
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@ -259,7 +259,7 @@ typedef struct
auerbufctl_t bufctl; /* controls the buffer chain */
auerscon_t scontext; /* service context */
wait_queue_head_t readwait; /* for synchronous reading */
struct semaphore readmutex; /* protection against multiple reads */
struct mutex readmutex; /* protection against multiple reads */
pauerbuf_t readbuf; /* buffer held for partial reading */
unsigned int readoffset; /* current offset in readbuf */
unsigned int removed; /* is != 0 if device is removed */
@ -1391,7 +1391,7 @@ static int auerchar_open (struct inode *inode, struct file *file)
/* Initialize device descriptor */
init_MUTEX( &ccp->mutex);
init_MUTEX( &ccp->readmutex);
mutex_init(&ccp->readmutex);
auerbuf_init (&ccp->bufctl);
ccp->scontext.id = AUH_UNASSIGNED;
ccp->scontext.dispatch = auerchar_ctrlread_dispatch;
@ -1585,7 +1585,7 @@ static ssize_t auerchar_read (struct file *file, char __user *buf, size_t count,
}
/* only one reader per device allowed */
if (down_interruptible (&ccp->readmutex)) {
if (mutex_lock_interruptible(&ccp->readmutex)) {
up (&ccp->mutex);
return -ERESTARTSYS;
}
@ -1603,7 +1603,7 @@ doreadbuf:
if (count) {
if (copy_to_user (buf, bp->bufp+ccp->readoffset, count)) {
dbg ("auerswald_read: copy_to_user failed");
up (&ccp->readmutex);
mutex_unlock(&ccp->readmutex);
up (&ccp->mutex);
return -EFAULT;
}
@ -1618,7 +1618,7 @@ doreadbuf:
}
/* return with number of bytes read */
if (count) {
up (&ccp->readmutex);
mutex_unlock(&ccp->readmutex);
up (&ccp->mutex);
return count;
}
@ -1655,7 +1655,7 @@ doreadlist:
dbg ("No read buffer available, returning -EAGAIN");
set_current_state (TASK_RUNNING);
remove_wait_queue (&ccp->readwait, &wait);
up (&ccp->readmutex);
mutex_unlock(&ccp->readmutex);
up (&ccp->mutex);
return -EAGAIN; /* nonblocking, no data available */
}
@ -1666,18 +1666,18 @@ doreadlist:
remove_wait_queue (&ccp->readwait, &wait);
if (signal_pending (current)) {
/* waked up by a signal */
up (&ccp->readmutex);
mutex_unlock(&ccp->readmutex);
return -ERESTARTSYS;
}
/* Anything left to read? */
if ((ccp->scontext.id == AUH_UNASSIGNED) || ccp->removed) {
up (&ccp->readmutex);
mutex_unlock(&ccp->readmutex);
return -EIO;
}
if (down_interruptible (&ccp->mutex)) {
up (&ccp->readmutex);
mutex_unlock(&ccp->readmutex);
return -ERESTARTSYS;
}