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From 80d7419e93a1195b46c6c917b4533ca440c12c82 Mon Sep 17 00:00:00 2001
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From: John Snow <jsnow@redhat.com>
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Date: Tue, 10 Jul 2018 23:06:16 +0200
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Subject: [PATCH 33/89] ahci: don't schedule unnecessary BH
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RH-Author: John Snow <jsnow@redhat.com>
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Message-id: <20180710230616.11000-4-jsnow@redhat.com>
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Patchwork-id: 81292
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 3/3] ahci: don't schedule unnecessary BH
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Bugzilla: 1584914
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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The comment gives us a hint. *Maybe* we still have something to
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process. Well, why not check?
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Signed-off-by: John Snow <jsnow@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Jeff Cody <jcody@redhat.com>
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Message-id: 20180531004323.4611-4-jsnow@redhat.com
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Signed-off-by: John Snow <jsnow@redhat.com>
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(cherry picked from commit 42af312adef8afdae11d5f83d12a404b178dbda4)
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Signed-off-by: John Snow <jsnow@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/ide/ahci.c | 3 +--
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1 file changed, 1 insertion(+), 2 deletions(-)
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diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
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index a9558e4..380366b 100644
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--- a/hw/ide/ahci.c
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+++ b/hw/ide/ahci.c
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@@ -1427,8 +1427,7 @@ static void ahci_cmd_done(IDEDMA *dma)
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/* update d2h status */
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ahci_write_fis_d2h(ad);
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- if (!ad->check_bh) {
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- /* maybe we still have something to process, check later */
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+ if (ad->port_regs.cmd_issue && !ad->check_bh) {
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ad->check_bh = qemu_bh_new(ahci_check_cmd_bh, ad);
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qemu_bh_schedule(ad->check_bh);
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}
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--
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1.8.3.1
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