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From: Zhu Lingshan <lingshan.zhu@intel.com>
To: mst@redhat.com, kvm@vger.kernel.org,
	virtualization@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	jasowang@redhat.com
Cc: lulu@redhat.com, dan.daly@intel.com, cunming.liang@intel.com,
	Zhu Lingshan <lingshan.zhu@intel.com>
Subject: [PATCH RESEND 2/5] ifcvf: ignore continuous setting same staus value
Date: Fri,  5 Jun 2020 18:27:12 +0800	[thread overview]
Message-ID: <1591352835-22441-3-git-send-email-lingshan.zhu@intel.com> (raw)
In-Reply-To: <1591352835-22441-1-git-send-email-lingshan.zhu@intel.com>

User space may try to set status of same value for multiple times,
this patch can handle this case more efficiently by ignoring the
same value of status settings.

Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
---
 drivers/vdpa/ifcvf/ifcvf_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/vdpa/ifcvf/ifcvf_main.c b/drivers/vdpa/ifcvf/ifcvf_main.c
index d529ed6..63a6366 100644
--- a/drivers/vdpa/ifcvf/ifcvf_main.c
+++ b/drivers/vdpa/ifcvf/ifcvf_main.c
@@ -179,6 +179,9 @@ static void ifcvf_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
 	adapter = dev_get_drvdata(vdpa_dev->dev.parent);
 	status_old = ifcvf_get_status(vf);
 
+	if (status_old == status)
+		return;
+
 	if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) &&
 	    !(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 		ifcvf_stop_datapath(adapter);
-- 
1.8.3.1


  parent reply	other threads:[~2020-06-05 10:31 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-05 10:27 [PATCH RESEND 0/5] vDPA:config interrupt support and IRQ improvements Zhu Lingshan
2020-06-05 10:27 ` [PATCH RESEND 1/5] ifcvf: move IRQ request/free to status change handlers Zhu Lingshan
2020-06-05 10:27 ` Zhu Lingshan [this message]
2020-06-05 10:27 ` [PATCH RESEND 3/5] vhost_vdpa: Support config interrupt in vdpa Zhu Lingshan
2020-06-05 10:27 ` [PATCH RESEND 4/5] vhost: replace -1 with VHOST_FILE_UNBIND in iotcls Zhu Lingshan
2020-06-05 10:27 ` [PATCH RESEND 5/5] ifcvf: implement config interrupt in IFCVF Zhu Lingshan

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