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MFC r196496

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Add a reminder comment to optimize bus_dmamap_sync calls.
This commit is contained in:
Andrew Thompson 2009-10-29 23:13:02 +00:00
parent edd4ee99cf
commit f18778a473
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/stable/8/; revision=198637
1 changed files with 6 additions and 0 deletions
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6
sys/dev/usb/usb_busdma.c
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@ -679,6 +679,12 @@ usb_pc_cpu_invalidate(struct usb_page_cache *pc)
/* 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);
}