| commit | 32fe01985aa2cb2562f6fc171e526e279abe10db | |
| author | Alan Stern <stern@rowland.harvard.edu> | |
| Wed, 10 Oct 2007 20:27:07 +0000 (10 16:27 -0400) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Fri, 12 Oct 2007 21:55:34 +0000 (12 14:55 -0700) | ||
| tree | 0c1865a1d3e91ae0839147430480c4099b16a06f | treesnapshot (tar.gz zip) |
| parent | 17f060224fb9f435c6f9306b7b61419d038def13 | commitdiff |
USB: mutual exclusion for EHCI init and port resets
This patch (as999) fixes a problem that sometimes shows up when host
controller driver modules are loaded in the wrong order. If ehci-hcd
happens to initialize an EHCI controller while the companion OHCI or
UHCI controller is in the middle of a port reset, the reset can fail
and the companion may get very confused. The patch adds an
rw-semaphore and uses it to keep EHCI initialization and port resets
mutually exclusive.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <david-b@pacbell.net>
Cc: David Miller <davem@davemloft.net>
Cc: Dely L Sy <dely.l.sy@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This patch (as999) fixes a problem that sometimes shows up when host
controller driver modules are loaded in the wrong order. If ehci-hcd
happens to initialize an EHCI controller while the companion OHCI or
UHCI controller is in the middle of a port reset, the reset can fail
and the companion may get very confused. The patch adds an
rw-semaphore and uses it to keep EHCI initialization and port resets
mutually exclusive.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <david-b@pacbell.net>
Cc: David Miller <davem@davemloft.net>
Cc: Dely L Sy <dely.l.sy@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| drivers/usb/core/hcd.h | diffblobblamehistory | |
| drivers/usb/core/hub.c | diffblobblamehistory | |
| drivers/usb/host/ehci-hcd.c | diffblobblamehistory |