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vhost-scsi: Drop vhost_scsi_mutex use in port callouts 

We are using the vhost_scsi_mutex to make sure vhost_scsi_port_link and
vhost_scsi_port_unlink see if vhost_scsi_clear_endpoint has cleared
tpg->vhost_scsi and it can't be freed while they are using.

However, we currently set the tpg->vhost_scsi pointer while holding
tv_tpg_mutex. So, we can just hold that while calling
vhost_scsi_hotplug/hotunplug. We then don't need to hold the
vhost_scsi_mutex while vhost_scsi_clear_endpoint is holding it and doing
a flush which could cause the LUN map/unmap to have to wait on another
device's flush.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
Message-Id: <20230321020624.13323-7-michael.christie@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Mike Christie 2023-03-20 21:06:23 -05:00 committed by Michael S. Tsirkin
parent ced9eb376a
commit f5ed6f9e82
1 changed files with 2 additions and 12 deletions
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14
drivers/vhost/scsi.c
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@ -2040,15 +2040,10 @@ static int vhost_scsi_port_link(struct se_portal_group *se_tpg,
struct vhost_scsi_tpg *tpg = container_of(se_tpg,
struct vhost_scsi_tpg, se_tpg);
mutex_lock(&vhost_scsi_mutex);
mutex_lock(&tpg->tv_tpg_mutex);
tpg->tv_tpg_port_count++;
mutex_unlock(&tpg->tv_tpg_mutex);
vhost_scsi_hotplug(tpg, lun);
mutex_unlock(&vhost_scsi_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
return 0;
}
@ -2059,15 +2054,10 @@ static void vhost_scsi_port_unlink(struct se_portal_group *se_tpg,
struct vhost_scsi_tpg *tpg = container_of(se_tpg,
struct vhost_scsi_tpg, se_tpg);
mutex_lock(&vhost_scsi_mutex);
mutex_lock(&tpg->tv_tpg_mutex);
tpg->tv_tpg_port_count--;
mutex_unlock(&tpg->tv_tpg_mutex);
vhost_scsi_hotunplug(tpg, lun);
mutex_unlock(&vhost_scsi_mutex);
mutex_unlock(&tpg->tv_tpg_mutex);
}
static ssize_t vhost_scsi_tpg_attrib_fabric_prot_type_store(