Author: alfred
Date: Mon Aug 24 05:03:30 2009
New Revision: 196496
URL: http://svn.freebsd.org/changeset/base/196496
Log:
Add a reminder comment to optimize bus_dmamap_sync calls.
Submitted by: hps
Modified:
head/sys/dev/usb/usb_busdma.c
Modified: head/sys/dev/usb/usb_busdma.c
==============================================================================
--- head/sys/dev/usb/usb_busdma.c Mon Aug 24 05:02:36 2009
(r196495)
+++ head/sys/dev/usb/usb_busdma.c Mon Aug 24 05:03:30 2009
(r196496)
@@ -679,6 +679,12 @@ usb_pc_cpu_invalidate(struct usb_page_ca
/* nothing has been loaded into this page cache! */
return;
}
+
+ /*
+ * TODO: We currently do XXX_POSTREAD and XXX_PREREAD at the
+ * same time, but in the future we should try to isolate the
+ * different cases to optimise the code. --HPS
+ */
bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_POSTREAD);
bus_dmamap_sync(pc->tag, pc->map, BUS_DMASYNC_PREREAD);
}
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