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Add a comment explaing why a flush workqueue is handled differently from

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read/write workqueue requests.
This commit is contained in:
bouyer 2011-08-07 17:15:40 +00:00
parent 48ed379bb7
commit d6cda51db2
1 changed files with 8 additions and 3 deletions
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11
sys/arch/xen/xen/xbdback_xenbus.c
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@ -1,4 +1,4 @@
/* $NetBSD: xbdback_xenbus.c,v 1.43 2011/08/07 17:10:35 bouyer Exp $ */
/* $NetBSD: xbdback_xenbus.c,v 1.44 2011/08/07 17:15:40 bouyer Exp $ */
/*
* Copyright (c) 2006 Manuel Bouyer.
@ -26,7 +26,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: xbdback_xenbus.c,v 1.43 2011/08/07 17:10:35 bouyer Exp $");
__KERNEL_RCSID(0, "$NetBSD: xbdback_xenbus.c,v 1.44 2011/08/07 17:15:40 bouyer Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -1047,7 +1047,12 @@ xbdback_co_cache_doflush(struct xbdback_instance *xbdi, void *obj)
xbd_io->xio_operation = xbdi->xbdi_xen_req.operation;
xbd_io->xio_flush_id = xbdi->xbdi_xen_req.id;
workqueue_enqueue(xbdback_workqueue, &xbdi->xbdi_io->xio_work, NULL);
/* xbdback_do_io() will advance req pointer and restart processing */
/*
* xbdback_do_io() will advance req pointer and restart processing.
* Note that we could probably set xbdi->xbdi_io to NULL and
* let the processing continue, but we really want to wait
* for the flush to complete before doing any more work.
*/
xbdi->xbdi_cont = xbdback_co_cache_doflush_wait;
return NULL;
}