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| author | Alan Stern <stern@rowland.harvard.edu> | 2007-10-10 16:27:07 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-10-12 14:55:34 -0700 |
| commit | 32fe01985aa2cb2562f6fc171e526e279abe10db (patch) | |
| tree | 0c1865a1d3e91ae0839147430480c4099b16a06f /Documentation/usb | |
| parent | 17f060224fb9f435c6f9306b7b61419d038def13 (diff) | |
| download | blackbird-op-linux-32fe01985aa2cb2562f6fc171e526e279abe10db.tar.gz blackbird-op-linux-32fe01985aa2cb2562f6fc171e526e279abe10db.zip | |
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>
Diffstat (limited to 'Documentation/usb')
0 files changed, 0 insertions, 0 deletions
