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USB: change name of spinlock in hcd.c

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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>
This commit is contained in:
Alan Stern 2007-07-18 12:14:24 -04:00 committed by Greg Kroah-Hartman
parent 32aca56005
commit 809a58b896
1 changed files with 26 additions and 23 deletions
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49
drivers/usb/core/hcd.c
View file

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