From: Oliver Neukum Date: Fri, 15 Dec 2006 22:48:56 +0000 (+0100) Subject: USB: mutexification of rio500 X-Git-Tag: v2.6.21-rc2~42^2~9^2~57 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=2cba72f02559ec0bbbcdba8d2604517515b55f03;p=linux-2.6-omap-h63xx.git USB: mutexification of rio500 this makes the rio500 misc usb driver use mutexes and turns uninterruptible sleep into interruptible sleep where the semantics are not affected. Signed-off-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/misc/rio500.c b/drivers/usb/misc/rio500.c index 384fa376980..fdf68479a16 100644 --- a/drivers/usb/misc/rio500.c +++ b/drivers/usb/misc/rio500.c @@ -69,7 +69,7 @@ struct rio_usb_data { char *obuf, *ibuf; /* transfer buffers */ char bulk_in_ep, bulk_out_ep; /* Endpoint assignments */ wait_queue_head_t wait_q; /* for timeouts */ - struct semaphore lock; /* general race avoidance */ + struct mutex lock; /* general race avoidance */ }; static struct rio_usb_data rio_instance; @@ -78,17 +78,17 @@ static int open_rio(struct inode *inode, struct file *file) { struct rio_usb_data *rio = &rio_instance; - down(&(rio->lock)); + mutex_lock(&(rio->lock)); if (rio->isopen || !rio->present) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return -EBUSY; } rio->isopen = 1; init_waitqueue_head(&rio->wait_q); - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); info("Rio opened."); @@ -117,7 +117,7 @@ ioctl_rio(struct inode *inode, struct file *file, unsigned int cmd, int retries; int retval=0; - down(&(rio->lock)); + mutex_lock(&(rio->lock)); /* Sanity check to make sure rio is connected, powered, etc */ if ( rio == NULL || rio->present == 0 || @@ -257,7 +257,7 @@ ioctl_rio(struct inode *inode, struct file *file, unsigned int cmd, err_out: - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return retval; } @@ -275,14 +275,17 @@ write_rio(struct file *file, const char __user *buffer, int result = 0; int maxretry; int errn = 0; + int intr; - down(&(rio->lock)); + intr = mutex_lock_interruptible(&(rio->lock)); + if (intr) + return -EINTR; /* Sanity check to make sure rio is connected, powered, etc */ if ( rio == NULL || rio->present == 0 || rio->rio_dev == NULL ) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return -ENODEV; } @@ -305,7 +308,7 @@ write_rio(struct file *file, const char __user *buffer, goto error; } if (signal_pending(current)) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return bytes_written ? bytes_written : -EINTR; } @@ -341,12 +344,12 @@ write_rio(struct file *file, const char __user *buffer, buffer += copy_size; } while (count > 0); - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return bytes_written ? bytes_written : -EIO; error: - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return errn; } @@ -361,14 +364,17 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos) int result; int maxretry = 10; char *ibuf; + int intr; - down(&(rio->lock)); + intr = mutex_lock_interruptible(&(rio->lock)); + if (intr) + return -EINTR; /* Sanity check to make sure rio is connected, powered, etc */ if ( rio == NULL || rio->present == 0 || rio->rio_dev == NULL ) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return -ENODEV; } @@ -379,11 +385,11 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos) while (count > 0) { if (signal_pending(current)) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return read_count ? read_count : -EINTR; } if (!rio->rio_dev) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return -ENODEV; } this_read = (count >= IBUF_SIZE) ? IBUF_SIZE : count; @@ -400,7 +406,7 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos) count = this_read = partial; } else if (result == -ETIMEDOUT || result == 15) { /* FIXME: 15 ??? */ if (!maxretry--) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); err("read_rio: maxretry timeout"); return -ETIME; } @@ -409,18 +415,18 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos) finish_wait(&rio->wait_q, &wait); continue; } else if (result != -EREMOTEIO) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); err("Read Whoops - result:%u partial:%u this_read:%u", result, partial, this_read); return -EIO; } else { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return (0); } if (this_read) { if (copy_to_user(buffer, ibuf, this_read)) { - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return -EFAULT; } count -= this_read; @@ -428,7 +434,7 @@ read_rio(struct file *file, char __user *buffer, size_t count, loff_t * ppos) buffer += this_read; } } - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return read_count; } @@ -480,7 +486,7 @@ static int probe_rio(struct usb_interface *intf, } dbg("probe_rio: ibuf address:%p", rio->ibuf); - init_MUTEX(&(rio->lock)); + mutex_init(&(rio->lock)); usb_set_intfdata (intf, rio); rio->present = 1; @@ -496,12 +502,12 @@ static void disconnect_rio(struct usb_interface *intf) if (rio) { usb_deregister_dev(intf, &usb_rio_class); - down(&(rio->lock)); + mutex_lock(&(rio->lock)); if (rio->isopen) { rio->isopen = 0; /* better let it finish - the release will do whats needed */ rio->rio_dev = NULL; - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); return; } kfree(rio->ibuf); @@ -510,7 +516,7 @@ static void disconnect_rio(struct usb_interface *intf) info("USB Rio disconnected."); rio->present = 0; - up(&(rio->lock)); + mutex_unlock(&(rio->lock)); } }