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USB: EHCI: store reason for unlinking a QH

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This patch replaces the "exception" bitflag in the ehci_qh structure
with a more explicit "unlink_reason" bitmask.  This is for use in the
following patch, where we will need to have a good idea of the
reason for unlinking a QH, not just "something exceptional happened".

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Michael Reutman <mreutman@epiqsolutions.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern
2016-01-25 15:42:04 -05:00
committed by Greg Kroah-Hartman
parent 4f97f8f5f0
commit fcc5184ec1
5 changed files with 26 additions and 11 deletions
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10
drivers/usb/host/ehci.h
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@@ -432,13 +432,19 @@ struct ehci_qh {
u8 xacterrs; /* XactErr retry counter */
#define QH_XACTERR_MAX 32 /* XactErr retry limit */
u8 unlink_reason;
#define QH_UNLINK_HALTED 0x01 /* Halt flag is set */
#define QH_UNLINK_SHORT_READ 0x02 /* Recover from a short read */
#define QH_UNLINK_DUMMY_OVERLAY 0x04 /* QH overlayed the dummy TD */
#define QH_UNLINK_SHUTDOWN 0x08 /* The HC isn't running */
#define QH_UNLINK_QUEUE_EMPTY 0x10 /* Reached end of the queue */
#define QH_UNLINK_REQUESTED 0x20 /* Disable, reset, or dequeue */
u8 gap_uf; /* uframes split/csplit gap */
unsigned is_out:1; /* bulk or intr OUT */
unsigned clearing_tt:1; /* Clear-TT-Buf in progress */
unsigned dequeue_during_giveback:1;
unsigned exception:1; /* got a fault, or an unlink
was requested */
unsigned should_be_inactive:1;
};