From 084ed45b3846ffb803a6cd6d631c1723e77689e0 Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Thu, 6 Jun 2013 02:20:41 -0700 Subject: vhost/scsi: Convert to se_cmd->cmd_kref TARGET_SCF_ACK_KREF usage This patch coverts vhost/scsi to se_cmd->cmd_kref TARGET_SCF_ACK_KREF usage, instead of assuming that vhost_scsi_free_cmd() is always called before TCM processing is completed in the response fast path. This includes adding vhost_scsi_check_stop_free() -> target_put_sess_cmd() to perform the second se_cmd->cmd_kref put, and moving vhost_scsi_free_cmd() resource release into tcm_vhost_release_cmd() that is invoked once the last se_cmd->cmd_kref put occurs. Cc: Christoph Hellwig Cc: Roland Dreier Cc: Kent Overstreet Cc: Asias He Cc: Michael S. Tsirkin Cc: Or Gerlitz Cc: Moussa Ba Signed-off-by: Nicholas Bellinger --- drivers/vhost/scsi.c | 31 +++++++++++++++++++------------ 1 file changed, 19 insertions(+), 12 deletions(-) (limited to 'drivers/vhost') diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index aacf71ea001..1e5e82042f8 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -446,7 +446,19 @@ static u32 tcm_vhost_tpg_get_inst_index(struct se_portal_group *se_tpg) static void tcm_vhost_release_cmd(struct se_cmd *se_cmd) { - return; + struct tcm_vhost_cmd *tv_cmd = container_of(se_cmd, + struct tcm_vhost_cmd, tvc_se_cmd); + + if (tv_cmd->tvc_sgl_count) { + u32 i; + for (i = 0; i < tv_cmd->tvc_sgl_count; i++) + put_page(sg_page(&tv_cmd->tvc_sgl[i])); + + kfree(tv_cmd->tvc_sgl); + } + + tcm_vhost_put_inflight(tv_cmd->inflight); + kfree(tv_cmd); } static int tcm_vhost_shutdown_session(struct se_session *se_sess) @@ -559,17 +571,11 @@ static void vhost_scsi_free_cmd(struct tcm_vhost_cmd *tv_cmd) /* TODO locking against target/backend threads? */ transport_generic_free_cmd(se_cmd, 0); - if (tv_cmd->tvc_sgl_count) { - u32 i; - for (i = 0; i < tv_cmd->tvc_sgl_count; i++) - put_page(sg_page(&tv_cmd->tvc_sgl[i])); - - kfree(tv_cmd->tvc_sgl); - } - - tcm_vhost_put_inflight(tv_cmd->inflight); +} - kfree(tv_cmd); +static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) +{ + return target_put_sess_cmd(se_cmd->se_sess, se_cmd); } static void tcm_vhost_do_evt_work(struct vhost_scsi *vs, @@ -847,7 +853,7 @@ static void tcm_vhost_submission_work(struct work_struct *work) tv_cmd->tvc_cdb, &tv_cmd->tvc_sense_buf[0], tv_cmd->tvc_lun, tv_cmd->tvc_exp_data_len, tv_cmd->tvc_task_attr, tv_cmd->tvc_data_direction, - 0, sg_ptr, tv_cmd->tvc_sgl_count, + TARGET_SCF_ACK_KREF, sg_ptr, tv_cmd->tvc_sgl_count, sg_bidi_ptr, sg_no_bidi); if (rc < 0) { transport_send_check_condition_and_sense(se_cmd, @@ -2008,6 +2014,7 @@ static struct target_core_fabric_ops tcm_vhost_ops = { .tpg_release_fabric_acl = tcm_vhost_release_fabric_acl, .tpg_get_inst_index = tcm_vhost_tpg_get_inst_index, .release_cmd = tcm_vhost_release_cmd, + .check_stop_free = vhost_scsi_check_stop_free, .shutdown_session = tcm_vhost_shutdown_session, .close_session = tcm_vhost_close_session, .sess_get_index = tcm_vhost_sess_get_index, -- cgit v1.2.3-18-g5258