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authorAlan Stern <stern@rowland.harvard.edu>2008-06-30 11:14:43 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-07-21 15:16:48 -0700
commit86c57edf60f5c98adb496880f56cd0e5a3423153 (patch)
treee95742e71c85f85549d3be390803d1fa5328853f /Documentation
parentac90e36592ea5171c4e70f58b39a782d871a7d9f (diff)
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 'Documentation')
-rw-r--r--Documentation/usb/persist.txt7
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/usb/persist.txt b/Documentation/usb/persist.txt
index d56cb1a1155..074b159b77c 100644
--- a/Documentation/usb/persist.txt
+++ b/Documentation/usb/persist.txt
@@ -81,8 +81,11 @@ re-enumeration shows that the device now attached to that port has the
same descriptors as before, including the Vendor and Product IDs, then
the kernel continues to use the same device structure. In effect, the
kernel treats the device as though it had merely been reset instead of
-unplugged. The same thing happens if the host controller is in the
-expected state but a USB device was unplugged and then replugged.
+unplugged.
+
+The same thing happens if the host controller is in the expected state
+but a USB device was unplugged and then replugged, or if a USB device
+fails to carry out a normal resume.
If no device is now attached to the port, or if the descriptors are
different from what the kernel remembers, then the treatment is what