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We currently don't need to because we are holding the vhost_scsi_mutex and the dev.mutex when incrementing/decrementing in the normal paths, and we can't hit the tv_tpg_port_count check in vhost_scsi_drop_nexus during this time because there is a nexus and we have a refcount to the tpg. In the next patch we will change when we hold the vhost_scsi_mutex, so it's not always held in set/clear endpoint and in the future we might change the dev.mutex use, so this future proofs us. Signed-off-by: Mike Christie --- drivers/vhost/scsi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index d5ecb8876fc9..c31659aa5466 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -1658,7 +1658,9 @@ vhost_scsi_set_endpoint(struct vhost_scsi *vs, for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { tpg = vs_tpg[i]; if (tpg) { + mutex_lock(&tpg->tv_tpg_mutex); tpg->tv_tpg_vhost_count--; + mutex_unlock(&tpg->tv_tpg_mutex); target_undepend_item(&tpg->se_tpg.tpg_group.cg_item); } } -- 2.25.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 903BEC64EC7 for ; Thu, 23 Feb 2023 00:20:10 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id AA96741677; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" This has us hold the tv_tpg_mutex when decrementing the tv_tpg_vhost_count in vhost_scsi_set_endpoint's failure path. We currently don't need to because we are holding the vhost_scsi_mutex and the dev.mutex when incrementing/decrementing in the normal paths, and we can't hit the tv_tpg_port_count check in vhost_scsi_drop_nexus during this time because there is a nexus and we have a refcount to the tpg. In the next patch we will change when we hold the vhost_scsi_mutex, so it's not always held in set/clear endpoint and in the future we might change the dev.mutex use, so this future proofs us. Signed-off-by: Mike Christie --- drivers/vhost/scsi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index d5ecb8876fc9..c31659aa5466 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -1658,7 +1658,9 @@ vhost_scsi_set_endpoint(struct vhost_scsi *vs, for (i = 0; i < VHOST_SCSI_MAX_TARGET; i++) { tpg = vs_tpg[i]; if (tpg) { + mutex_lock(&tpg->tv_tpg_mutex); tpg->tv_tpg_vhost_count--; + mutex_unlock(&tpg->tv_tpg_mutex); target_undepend_item(&tpg->se_tpg.tpg_group.cg_item); } } -- 2.25.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization