From: Mike Christie Date: Sat, 16 Mar 2024 00:47:00 +0000 (-0500) Subject: vhost-scsi: Handle vhost_vq_work_queue failures for cmds X-Git-Tag: Ubuntu-6.11.0-9.9~1359^2~40 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=1eceddeeb6a9beb7ef2a22c176c03c5ff18c6386;p=mirror_ubuntu-kernels.git vhost-scsi: Handle vhost_vq_work_queue failures for cmds In the next patches we will support the vhost_task being killed while in use. The problem for vhost-scsi is that we can't free some structs until we get responses for commands we have submitted to the target layer and we currently process the responses from the vhost_task. This has just drop the responses and free the command's resources. When all commands have completed then operations like flush will be woken up and we can complete device release and endpoint cleanup. Signed-off-by: Mike Christie Message-Id: <20240316004707.45557-3-michael.christie@oracle.com> Signed-off-by: Michael S. Tsirkin --- diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index f34f9895b898..6ec1abe7364f 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -358,6 +358,16 @@ static void vhost_scsi_release_tmf_res(struct vhost_scsi_tmf *tmf) vhost_scsi_put_inflight(inflight); } +static void vhost_scsi_drop_cmds(struct vhost_scsi_virtqueue *svq) +{ + struct vhost_scsi_cmd *cmd, *t; + struct llist_node *llnode; + + llnode = llist_del_all(&svq->completion_list); + llist_for_each_entry_safe(cmd, t, llnode, tvc_completion_list) + vhost_scsi_release_cmd_res(&cmd->tvc_se_cmd); +} + static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) { if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) { @@ -373,7 +383,8 @@ static void vhost_scsi_release_cmd(struct se_cmd *se_cmd) struct vhost_scsi_virtqueue, vq); llist_add(&cmd->tvc_completion_list, &svq->completion_list); - vhost_vq_work_queue(&svq->vq, &svq->completion_work); + if (!vhost_vq_work_queue(&svq->vq, &svq->completion_work)) + vhost_scsi_drop_cmds(svq); } }