search for: vhost_scsi_port_link

We don't need the vhost_scsi_mutex in vhost_scsi_port_link and vhost_scsi_port_unlink because LIO has a refcount on the se_tpg for us, so it can't be removed while these functions are called. This removes the vhost_scsi_mutex from those functions to avoid cases where we are adding or removing LUNs to vhost-deviceA but are stuck waiting on the vhost_scs...

The following patches were made over Linus tree. The patches fix 3 issues: 1. If a user performs LIO LUN unmapping before the endpoint has been cleared then we can end up trying to free a bogus tmf struct if the TMF is still exucuting when we do the unmap. 2. If vhost_scsi_setup_vq_cmds fails we can leave the tpg->vhost_scsi pointer set and we can end up trying to access a freed struct. 3.

The following patches were made over Linus tree and also apply over mst tree's vhost branch. The patches fix an issue where management operations like LUN mapping/unmapping and device addition hang for 30 seconds or up to N minutes depending on the device. The problem is that we use a global mutex to protect the list of tpgs but we hold that mutex during those management operations. So if you