loop/usb/vhost-scsi/xen-scsiback: Fix use of __transport_register_session

This patch changes loopback, usb-gadget, vhost-scsi and xen-scsiback
fabric code to invoke transport_register_session() instead of the
unprotected flavour, to ensure se_tpg->session_lock is taken when
adding new session list nodes to se_tpg->tpg_sess_list.

Note that since these four fabric drivers already hold their own
internal TPG mutexes when accessing se_tpg->tpg_sess_list, and
consist of a single se_session created through configfs attribute
access, no list corruption can currently occur.

So for correctness sake, go ahead and use the se_tpg->session_lock
protected version for these four fabric drivers.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 6b3c329..c36bd7c 100644 (file)
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -953,11 +953,8 @@ static int tcm_loop_make_nexus(
                transport_free_session(tl_nexus->se_sess);
                goto out;
        }
-       /*
-        * Now, register the SAS I_T Nexus as active with the call to
-        * transport_register_session()
-        */
-       __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
+       /* Now, register the SAS I_T Nexus as active. */
+       transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
                        tl_nexus->se_sess, tl_nexus);
        tl_tpg->tl_nexus = tl_nexus;
        pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"

diff --git a/drivers/usb/gadget/legacy/tcm_usb_gadget.c b/drivers/usb/gadget/legacy/tcm_usb_gadget.c
index 3a49416..6e0a019 100644 (file)
--- a/drivers/usb/gadget/legacy/tcm_usb_gadget.c
+++ b/drivers/usb/gadget/legacy/tcm_usb_gadget.c
@@ -1740,10 +1740,9 @@ static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
                goto err_session;
        }
        /*
-        * Now register the TCM vHost virtual I_T Nexus as active with the
-        * call to __transport_register_session()
+        * Now register the TCM vHost virtual I_T Nexus as active.
         */
-       __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
+       transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
                        tv_nexus->tvn_se_sess, tv_nexus);
        tpg->tpg_nexus = tv_nexus;
        mutex_unlock(&tpg->tpg_mutex);

diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 8d4f3f1..71df240 100644 (file)
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -1956,10 +1956,9 @@ static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
                goto out;
        }
        /*
-        * Now register the TCM vhost virtual I_T Nexus as active with the
-        * call to __transport_register_session()
+        * Now register the TCM vhost virtual I_T Nexus as active.
         */
-       __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
+       transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
                        tv_nexus->tvn_se_sess, tv_nexus);
        tpg->tpg_nexus = tv_nexus;
 

diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 61653a0..8511277 100644 (file)
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -1661,11 +1661,8 @@ static int scsiback_make_nexus(struct scsiback_tpg *tpg,
                         name);
                goto out;
        }
-       /*
-        * Now register the TCM pvscsi virtual I_T Nexus as active with the
-        * call to __transport_register_session()
-        */
-       __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
+       /* Now register the TCM pvscsi virtual I_T Nexus as active. */
+       transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
                        tv_nexus->tvn_se_sess, tv_nexus);
        tpg->tpg_nexus = tv_nexus;