diff options
| author |   Karsten Wiese <fzu@wemgehoertderstaat.de> | 2007-12-30 21:55:05 -0800 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-01 14:35:02 -0800 |
| commit | 3b6fcfd0664aeac6ae2fd1231f04b3ed24723c1e (patch) | |
| tree | 91f6bf59435039eefcd4a931bed274a0b33882f1 /drivers/usb | |
| parent | USB: add ehci-ixp bus glue (diff) | |
| download | linux-dev-3b6fcfd0664aeac6ae2fd1231f04b3ed24723c1e.tar.xz linux-dev-3b6fcfd0664aeac6ae2fd1231f04b3ed24723c1e.zip | |
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>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/ehci-sched.c | 4 | ||||
| -rw-r--r-- | drivers/usb/host/ehci.h | 1 |
2 files changed, 2 insertions, 3 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c index 1c771045ccaa..1a94e6cec419 100644 --- a/drivers/usb/host/ehci-sched.c +++ b/drivers/usb/host/ehci-sched.c @@ -119,7 +119,8 @@ periodic_usecs (struct ehci_hcd *ehci, unsigned frame, unsigned uframe) 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 @@ itd_link_urb ( 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; diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index f83472856a80..42969e9d8c44 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -602,7 +602,6 @@ struct ehci_itd { unsigned frame; /* where scheduled */ unsigned pg; unsigned index[8]; /* in urb->iso_frame_desc */ - u8 usecs[8]; } __attribute__ ((aligned (32))); /*-------------------------------------------------------------------------*/ |