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authorAlan Stern <stern@rowland.harvard.edu>2007-08-14 10:56:10 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-08-22 14:27:49 -0700
commit46dede4690bbb23a2c9d60561e2e4fdc3e6bee61 (patch)
tree98f9a30c7105294df497eb59722a54f70b9a294d /drivers/usb/core
parentf095137e799ddb6a7c2bf0e4c73cda193ab9df41 (diff)
USB: accept 1-byte Device Status replies, fixing some b0rken devices
Some devices have a bug which causes them to send a 1-byte reply to Get-Device-Status requests instead of 2 bytes as required by the spec. This doesn't play well with autosuspend, since we look for a valid status reply to make sure the device is still present when it resumes. Without both bytes, we assume the device has been disconnected. Lack of the second byte shouldn't matter much, since the spec requires it always to be equal to 0. Hence this patch (as959) causes finish_port_resume() to accept a 1-byte reply as valid. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/hub.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index e341a1da517..f7b337feb3e 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1644,9 +1644,10 @@ static int finish_port_resume(struct usb_device *udev)
* and device drivers will know about any resume quirks.
*/
if (status == 0) {
+ devstatus = 0;
status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
if (status >= 0)
- status = (status == 2 ? 0 : -ENODEV);
+ status = (status > 0 ? 0 : -ENODEV);
}
if (status) {