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USB: EHCI: use consistent NO_FRAME value

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ehci-hcd is inconsistent in the sentinel values it uses to indicate
that no frame number has been assigned for a periodic transfer.  Some
places it uses NO_FRAME (defined as 65535), other places it uses -1,
and elsewhere it uses 9999.

This patch defines a value for NO_FRAME which can fit in a 16-bit
signed integer, and changes the code to use it everywhere.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern
2013-10-11 11:28:52 -04:00
committed by Greg Kroah-Hartman
parent 27c4a31d67
commit 91a99b5e78
2 changed files with 7 additions and 6 deletions
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8
drivers/usb/host/ehci-sched.c
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@@ -813,7 +813,7 @@ static int qh_schedule(struct ehci_hcd *ehci, struct ehci_qh *qh)
frame = qh->start;
/* reuse the previous schedule slots, if we can */
if (frame < qh->period) {
if (frame != NO_FRAME) {
uframe = ffs(hc32_to_cpup(ehci, &hw->hw_info2) & QH_SMASK);
status = check_intr_schedule (ehci, frame, --uframe,
qh, &c_mask);
@@ -969,7 +969,7 @@ iso_stream_alloc (gfp_t mem_flags)
if (likely (stream != NULL)) {
INIT_LIST_HEAD(&stream->td_list);
INIT_LIST_HEAD(&stream->free_list);
stream->next_uframe = -1;
stream->next_uframe = NO_FRAME;
}
return stream;
}
@@ -1236,7 +1236,7 @@ itd_urb_transaction (
memset (itd, 0, sizeof *itd);
itd->itd_dma = itd_dma;
itd->frame = 9999; /* an invalid value */
itd->frame = NO_FRAME;
list_add (&itd->itd_list, &sched->td_list);
}
spin_unlock_irqrestore (&ehci->lock, flags);
@@ -1967,7 +1967,7 @@ sitd_urb_transaction (
memset (sitd, 0, sizeof *sitd);
sitd->sitd_dma = sitd_dma;
sitd->frame = 9999; /* an invalid value */
sitd->frame = NO_FRAME;
list_add (&sitd->sitd_list, &iso_sched->td_list);
}