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authorAlan Stern <stern@rowland.harvard.edu>2010-06-22 16:39:10 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-08-10 14:35:37 -0700
commit541c7d432f76771079e7c295d596ea47cc6a3030 (patch)
tree9e04330713366d21849cecf0f3fd2f2c1834574d /drivers/usb/host/ehci-sched.c
parent89ba85d4015b7fa738b35bcc228075c117a9a578 (diff)
downloadlinux-stericsson-541c7d432f76771079e7c295d596ea47cc6a3030.tar.gz
USB: convert usb_hcd bitfields into atomic flags
This patch (as1393) converts several of the single-bit fields in struct usb_hcd to atomic flags. This is for safety's sake; not all CPUs can update bitfield values atomically, and these flags are used in multiple contexts. The flag fields that are set only during registration or removal can remain as they are, since non-atomic accesses at those times will not cause any problems. (Strictly speaking, the authorized_default flag should become atomic as well. I didn't bother with it because it gets changed only via sysfs. It can be done later, if anyone wants.) Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci-sched.c')
-rw-r--r--drivers/usb/host/ehci-sched.c9
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 805ec633a652..d640346f9b56 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -880,8 +880,7 @@ static int intr_submit (
spin_lock_irqsave (&ehci->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &ehci_to_hcd(ehci)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
status = -ESHUTDOWN;
goto done_not_linked;
}
@@ -1815,8 +1814,7 @@ static int itd_submit (struct ehci_hcd *ehci, struct urb *urb,
/* schedule ... need to lock */
spin_lock_irqsave (&ehci->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &ehci_to_hcd(ehci)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
status = -ESHUTDOWN;
goto done_not_linked;
}
@@ -2201,8 +2199,7 @@ static int sitd_submit (struct ehci_hcd *ehci, struct urb *urb,
/* schedule ... need to lock */
spin_lock_irqsave (&ehci->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &ehci_to_hcd(ehci)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
status = -ESHUTDOWN;
goto done_not_linked;
}