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| author | Alan Stern <stern@rowland.harvard.edu> | 2008-06-30 11:14:43 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-07-21 15:16:48 -0700 |
| commit | 86c57edf60f5c98adb496880f56cd0e5a3423153 (patch) | |
| tree | e95742e71c85f85549d3be390803d1fa5328853f /drivers | |
| parent | ac90e36592ea5171c4e70f58b39a782d871a7d9f (diff) | |
| download | linux-86c57edf60f5c98adb496880f56cd0e5a3423153.tar.gz linux-86c57edf60f5c98adb496880f56cd0e5a3423153.tar.bz2 linux-86c57edf60f5c98adb496880f56cd0e5a3423153.zip | |
USB: use reset_resume when normal resume fails
This patch (as1109b) makes USB-Persist more resilient to errors. With
the current code, if a normal resume fails, it's an unrecoverable
error. With the patch, if a normal resume fails (and if the device is
enabled for USB-Persist) then a reset-resume is tried.
This fixes the problem reported in Bugzilla #10977.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/core/hub.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index f1efabbc1ca2..107e1d25ddec 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -1822,9 +1822,15 @@ static int check_port_resume_type(struct usb_device *udev, status = -ENODEV; } - /* Can't do a normal resume if the port isn't enabled */ - else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) - status = -ENODEV; + /* Can't do a normal resume if the port isn't enabled, + * so try a reset-resume instead. + */ + else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { + if (udev->persist_enabled) + udev->reset_resume = 1; + else + status = -ENODEV; + } if (status) { dev_dbg(hub->intfdev, @@ -1973,6 +1979,7 @@ static int finish_port_resume(struct usb_device *udev) * resumed. */ if (udev->reset_resume) + retry_reset_resume: status = usb_reset_and_verify_device(udev); /* 10.5.4.5 says be sure devices in the tree are still there. @@ -1984,6 +1991,13 @@ static int finish_port_resume(struct usb_device *udev) status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); if (status >= 0) status = (status > 0 ? 0 : -ENODEV); + + /* If a normal resume failed, try doing a reset-resume */ + if (status && !udev->reset_resume && udev->persist_enabled) { + dev_dbg(&udev->dev, "retry with reset-resume\n"); + udev->reset_resume = 1; + goto retry_reset_resume; + } } if (status) { |