USB: ehci saves some memory in ISO transfer descriptors
In the EHCI driver, itd->usecs[8] is used in periodic_usecs(), indexed by
uframe. For an ITD's unused uframes it is 0, else it contains the same
value as itd->stream->usecs. To check if an ITD's uframe is used, we can
instead test itd->hw_transaction[uframe]: if used, it will be nonzero no
matter what endianess is used.
This patch replaces those two uses, eliminates itd->usecs[], and saves
eight bytes from each ITD.
Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 1c77104..1a94e6c 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -119,7 +119,8 @@
q = &q->fstn->fstn_next;
break;
case Q_TYPE_ITD:
- usecs += q->itd->usecs [uframe];
+ if (q->itd->hw_transaction[uframe])
+ usecs += q->itd->stream->usecs;
hw_p = &q->itd->hw_next;
q = &q->itd->itd_next;
break;
@@ -1536,7 +1537,6 @@
uframe = next_uframe & 0x07;
frame = next_uframe >> 3;
- itd->usecs [uframe] = stream->usecs;
itd_patch(ehci, itd, iso_sched, packet, uframe);
next_uframe += stream->interval;