Test and set xbdi->xbdi_cont at splbio(). Otherwise we could overwrite
xbdi->xbdi_cont and process the same request twice.
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8d7cb782a7
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@ -1,4 +1,4 @@
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/* $NetBSD: xbdback_xenbus.c,v 1.32 2010/06/24 13:03:06 hannken Exp $ */
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/* $NetBSD: xbdback_xenbus.c,v 1.33 2011/03/05 15:12:16 bouyer Exp $ */
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/*
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* Copyright (c) 2006 Manuel Bouyer.
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@ -26,7 +26,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: xbdback_xenbus.c,v 1.32 2010/06/24 13:03:06 hannken Exp $");
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__KERNEL_RCSID(0, "$NetBSD: xbdback_xenbus.c,v 1.33 2011/03/05 15:12:16 bouyer Exp $");
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#include <sys/types.h>
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#include <sys/param.h>
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@ -1370,6 +1370,7 @@ xbdback_iodone(struct buf *bp)
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struct xbdback_io *xbd_io;
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struct xbdback_instance *xbdi;
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int errp;
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int s;
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xbd_io = bp->b_private;
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xbdi = xbd_io->xio_xbdi;
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@ -1424,11 +1425,13 @@ xbdback_iodone(struct buf *bp)
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atomic_dec_uint(&xbdi->xbdi_pendingreqs);
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buf_destroy(&xbd_io->xio_buf);
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xbdback_pool_put(&xbdback_io_pool, xbd_io);
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s = splbio();
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if (xbdi->xbdi_cont == NULL) {
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/* check if there is more work to do */
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xbdi->xbdi_cont = xbdback_co_main;
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xbdback_trampoline(xbdi, xbdi);
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}
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splx(s);
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}
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/*
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