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USB: ehci: handle large bulk URBs correctly (again)

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USB: ehci: Fixes completion for multi-qtd URB the short read case

When use of urb->status in the EHCI driver was reworked last August
(commit 14c04c0f88), a bug was inserted
in the handling of early completion for bulk transactions that need
more than one qTD (e.g. more than 20KB in one URB).

This patch resolves that problem by ensuring that the early completion
status is preserved until the URB is handed back to its submitter,
instead of resetting it after each qTD.

Signed-off-by: Misha Zhilin <misha@epiphan.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Misha Zhilin 2008-02-27 18:05:24 -08:00 committed by Greg Kroah-Hartman
parent 14f3546f32
commit b5f7a0ec11
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/host/ehci-q.c
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@ -319,10 +319,10 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
if (likely (last->urb != urb)) {
ehci_urb_done(ehci, last->urb, last_status);
count++;
last_status = -EINPROGRESS;
}
ehci_qtd_free (ehci, last);
last = NULL;
last_status = -EINPROGRESS;
}
/* ignore urbs submitted during completions we reported */