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 <[email protected]> --- drivers/vhost/scsi.c | 14 ++------------ 1 file changed, 2 insertions(+), 12 deletions(-) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index ba8097fcea43..d4372a4aff49 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -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( -- 2.25.1 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
