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authorAlan Stern <stern@rowland.harvard.edu>2006-08-12 00:52:39 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2006-09-27 22:58:54 +0400
commitd5cbad4b8b37acfde3e63d31b92561b87288ad0f (patch)
tree98869f0db85e1f257c5ddd13a2afda934626153a /drivers/usb/core/hub.h
parent455b25fb209c8241e2163b491228b28667d82c1c (diff)
downloadlinux-d5cbad4b8b37acfde3e63d31b92561b87288ad0f.tar.xz
usbcore: khubd and busy-port handling
We don't want khubd to start interfering in the device-resume process merely because the PORT_STATUS_C_SUSPEND feature happens to be set. Ports need to be marked as busy while a resume is taking place. In addition, so long as ports are marked as busy, khubd won't be able to clear their various status-change features. On an interrupt-driven root hub this could lead to an interrupt storm. Root hub IRQs should not be re-enabled until the busy_bits value is equal to 0. This patch (as765) fixes these two potential problems. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/hub.h')
-rw-r--r--drivers/usb/core/hub.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 29d5f45a8456..0f8e82a4d480 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -212,7 +212,8 @@ struct usb_hub {
unsigned long event_bits[1]; /* status change bitmask */
unsigned long change_bits[1]; /* ports with logical connect
status change */
- unsigned long busy_bits[1]; /* ports being reset */
+ unsigned long busy_bits[1]; /* ports being reset or
+ resumed */
#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
#error event_bits[] is too short!
#endif