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Commit fdd64df7 authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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USB: usbfs: Always unlink URBs in reverse order



When the kernel unlinks a bunch of URBs for a single endpoint, it
should always unlink them in reverse order.  This eliminates any
possibility that some URB x will be unlinked before it can execute but
the following URB x+1 will execute before it can be unlinked.  Such an
event would be bad, for obvious reasons.

Chris Dickens pointed out that usbfs doesn't behave this way when it
is unbound from an interface.  All pending URBs are cancelled, but in
the order of submission.  This patch changes the behavior to make the
unlinks occur in reverse order.  It similarly changes the behavior
when usbfs cancels the continuation URBs for a BULK endpoint.

Suggested-by: default avatarChris Dickens <christopher.a.dickens@gmail.com>
Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>

Link: https://lore.kernel.org/r/Pine.LNX.4.44L0.2001171045380.1571-100000@iolanthe.rowland.org


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 50f737ab
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