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USB: change name of spinlock in hcd.c
This patch (as940 renames hcd_data_lock in hcd.c to hcd_urb_list_lock, which is more descriptive of the lock's job. It also introduces a convenient inline routine for testing whether a particular USB device is a root hub. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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parent
32aca56005
commit
809a58b896
1 changed files with 26 additions and 23 deletions
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@ -99,12 +99,17 @@ EXPORT_SYMBOL_GPL (usb_bus_list_lock);
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/* used for controlling access to virtual root hubs */
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static DEFINE_SPINLOCK(hcd_root_hub_lock);
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/* used when updating hcd data */
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static DEFINE_SPINLOCK(hcd_data_lock);
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/* used when updating an endpoint's URB list */
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static DEFINE_SPINLOCK(hcd_urb_list_lock);
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/* wait queue for synchronous unlinks */
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DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
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static inline int is_root_hub(struct usb_device *udev)
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{
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return (udev->parent == NULL);
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}
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/*-------------------------------------------------------------------------*/
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/*
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@ -906,14 +911,13 @@ EXPORT_SYMBOL (usb_calc_bus_time);
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static void urb_unlink(struct usb_hcd *hcd, struct urb *urb)
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{
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unsigned long flags;
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int at_root_hub = (urb->dev == hcd->self.root_hub);
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/* clear all state linking urb to this dev (and hcd) */
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spin_lock_irqsave (&hcd_data_lock, flags);
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spin_lock_irqsave(&hcd_urb_list_lock, flags);
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list_del_init (&urb->urb_list);
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spin_unlock_irqrestore (&hcd_data_lock, flags);
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spin_unlock_irqrestore(&hcd_urb_list_lock, flags);
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if (hcd->self.uses_dma && !at_root_hub) {
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if (hcd->self.uses_dma && !is_root_hub(urb->dev)) {
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if (usb_pipecontrol (urb->pipe)
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&& !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
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dma_unmap_single (hcd->self.controller, urb->setup_dma,
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@ -955,7 +959,7 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
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// FIXME: verify that quiescing hc works right (RH cleans up)
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spin_lock_irqsave (&hcd_data_lock, flags);
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spin_lock_irqsave(&hcd_urb_list_lock, flags);
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ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
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[usb_pipeendpoint(urb->pipe)];
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if (unlikely (!ep))
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@ -972,7 +976,7 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
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status = -ESHUTDOWN;
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break;
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}
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spin_unlock_irqrestore (&hcd_data_lock, flags);
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spin_unlock_irqrestore(&hcd_urb_list_lock, flags);
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if (status) {
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INIT_LIST_HEAD (&urb->urb_list);
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usbmon_urb_submit_error(&hcd->self, urb, status);
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@ -986,7 +990,7 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
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urb = usb_get_urb (urb);
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atomic_inc (&urb->use_count);
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if (urb->dev == hcd->self.root_hub) {
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if (is_root_hub(urb->dev)) {
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/* NOTE: requirement on hub callers (usbfs and the hub
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* driver, for now) that URBs' urb->transfer_buffer be
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* valid and usb_buffer_{sync,unmap}() not be needed, since
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@ -1043,7 +1047,7 @@ unlink1 (struct usb_hcd *hcd, struct urb *urb)
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{
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int value;
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if (urb->dev == hcd->self.root_hub)
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if (is_root_hub(urb->dev))
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value = usb_rh_urb_dequeue (hcd, urb);
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else {
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@ -1091,11 +1095,11 @@ int usb_hcd_unlink_urb (struct urb *urb, int status)
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* that it was submitted. But as a rule it can't know whether or
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* not it's already been unlinked ... so we respect the reversed
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* lock sequence needed for the usb_hcd_giveback_urb() code paths
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* (urb lock, then hcd_data_lock) in case some other CPU is now
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* (urb lock, then hcd_urb_list_lock) in case some other CPU is now
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* unlinking it.
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*/
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spin_lock_irqsave (&urb->lock, flags);
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spin_lock (&hcd_data_lock);
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spin_lock(&hcd_urb_list_lock);
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sys = &urb->dev->dev;
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hcd = bus_to_hcd(urb->dev->bus);
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@ -1127,17 +1131,16 @@ int usb_hcd_unlink_urb (struct urb *urb, int status)
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* finish unlinking the initial failed usb_set_address()
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* or device descriptor fetch.
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*/
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if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags)
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&& hcd->self.root_hub != urb->dev) {
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if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags) &&
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!is_root_hub(urb->dev)) {
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dev_warn (hcd->self.controller, "Unlink after no-IRQ? "
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"Controller is probably using the wrong IRQ."
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"\n");
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"Controller is probably using the wrong IRQ.\n");
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set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
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}
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urb->status = status;
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spin_unlock (&hcd_data_lock);
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spin_unlock(&hcd_urb_list_lock);
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spin_unlock_irqrestore (&urb->lock, flags);
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retval = unlink1 (hcd, urb);
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@ -1146,7 +1149,7 @@ int usb_hcd_unlink_urb (struct urb *urb, int status)
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return retval;
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done:
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spin_unlock (&hcd_data_lock);
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spin_unlock(&hcd_urb_list_lock);
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spin_unlock_irqrestore (&urb->lock, flags);
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if (retval != -EIDRM && sys && sys->driver)
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dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval);
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@ -1203,7 +1206,7 @@ void usb_hcd_endpoint_disable (struct usb_device *udev,
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/* ep is already gone from udev->ep_{in,out}[]; no more submits */
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rescan:
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spin_lock (&hcd_data_lock);
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spin_lock(&hcd_urb_list_lock);
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list_for_each_entry (urb, &ep->urb_list, urb_list) {
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int tmp;
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@ -1211,7 +1214,7 @@ void usb_hcd_endpoint_disable (struct usb_device *udev,
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if (urb->status != -EINPROGRESS)
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continue;
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usb_get_urb (urb);
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spin_unlock (&hcd_data_lock);
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spin_unlock(&hcd_urb_list_lock);
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spin_lock (&urb->lock);
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tmp = urb->status;
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@ -1240,7 +1243,7 @@ void usb_hcd_endpoint_disable (struct usb_device *udev,
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/* list contents may have changed */
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goto rescan;
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}
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spin_unlock (&hcd_data_lock);
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spin_unlock(&hcd_urb_list_lock);
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local_irq_enable ();
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/* synchronize with the hardware, so old configuration state
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@ -1257,7 +1260,7 @@ void usb_hcd_endpoint_disable (struct usb_device *udev,
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* endpoint_disable methods.
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*/
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while (!list_empty (&ep->urb_list)) {
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spin_lock_irq (&hcd_data_lock);
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spin_lock_irq(&hcd_urb_list_lock);
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/* The list may have changed while we acquired the spinlock */
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urb = NULL;
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@ -1266,7 +1269,7 @@ void usb_hcd_endpoint_disable (struct usb_device *udev,
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urb_list);
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usb_get_urb (urb);
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}
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spin_unlock_irq (&hcd_data_lock);
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spin_unlock_irq(&hcd_urb_list_lock);
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if (urb) {
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usb_kill_urb (urb);
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