xhci: Don't show incorrect WARN message about events for empty rings

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commit e4ec40ec4b upstream.

xHC can generate two events for a short transfer if the short TRB and
last TRB in the TD are not the same TRB.

The driver will handle the TD after the first short event, and remove
it from its internal list. Driver then incorrectly prints a warning
for the second event:

"WARN Event TRB for slot x ep y with no TDs queued"

Fix this by not printing a warning if we get a event on a empty list
if the previous event was a short event.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Mathias Nyman 2017-12-01 13:41:19 +02:00 • committed by Greg Kroah-Hartman

parent 8bc546bbfe

commit 3328861948

1 changed files with 8 additions and 4 deletions

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drivers/usb/host/xhci-ring.c

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