Date: Fri, 25 Nov 2016 06:48:53 +0000 (UTC) From: Sepherosa Ziehau <sephe@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r309133 - head/sys/dev/hyperv/vmbus Message-ID: <201611250648.uAP6mrPj071262@repo.freebsd.org>
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Author: sephe Date: Fri Nov 25 06:48:53 2016 New Revision: 309133 URL: https://svnweb.freebsd.org/changeset/base/309133 Log: hyperv/vmbus: GPADL disconnect error on a revoked channel is benign. MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D8567 Modified: head/sys/dev/hyperv/vmbus/vmbus_chan.c Modified: head/sys/dev/hyperv/vmbus/vmbus_chan.c ============================================================================== --- head/sys/dev/hyperv/vmbus/vmbus_chan.c Fri Nov 25 06:12:18 2016 (r309132) +++ head/sys/dev/hyperv/vmbus/vmbus_chan.c Fri Nov 25 06:48:53 2016 (r309133) @@ -66,6 +66,8 @@ static int vmbus_chan_release(struct v static void vmbus_chan_set_chmap(struct vmbus_channel *); static void vmbus_chan_clear_chmap(struct vmbus_channel *); static void vmbus_chan_detach(struct vmbus_channel *); +static bool vmbus_chan_wait_revoke( + const struct vmbus_channel *); static void vmbus_chan_ins_prilist(struct vmbus_softc *, struct vmbus_channel *); @@ -589,6 +591,24 @@ vmbus_chan_gpadl_connect(struct vmbus_ch return 0; } +static bool +vmbus_chan_wait_revoke(const struct vmbus_channel *chan) +{ +#define WAIT_COUNT 200 /* 200ms */ + + int i; + + for (i = 0; i < WAIT_COUNT; ++i) { + if (vmbus_chan_is_revoked(chan)) + return (true); + /* Not sure about the context; use busy-wait. */ + DELAY(1000); + } + return (false); + +#undef WAIT_COUNT +} + /* * Disconnect the GPA from the target channel */ @@ -605,7 +625,7 @@ vmbus_chan_gpadl_disconnect(struct vmbus vmbus_chan_printf(chan, "can not get msg hypercall for gpadl_disconn(chan%u)\n", chan->ch_id); - return EBUSY; + return (EBUSY); } req = vmbus_msghc_dataptr(mh); @@ -615,18 +635,29 @@ vmbus_chan_gpadl_disconnect(struct vmbus error = vmbus_msghc_exec(sc, mh); if (error) { + vmbus_msghc_put(sc, mh); + + if (vmbus_chan_wait_revoke(chan)) { + /* + * Error is benign; this channel is revoked, + * so this GPADL will not be touched anymore. + */ + vmbus_chan_printf(chan, + "gpadl_disconn(revoked chan%u) msg hypercall " + "exec failed: %d\n", chan->ch_id, error); + return (0); + } vmbus_chan_printf(chan, "gpadl_disconn(chan%u) msg hypercall exec failed: %d\n", chan->ch_id, error); - vmbus_msghc_put(sc, mh); - return error; + return (error); } vmbus_msghc_wait_result(sc, mh); /* Discard result; no useful information */ vmbus_msghc_put(sc, mh); - return 0; + return (0); } static void
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