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

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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>
This commit is contained in:
Bart Van Assche 2015-02-12 11:48:49 +01:00 committed by Nicholas Bellinger
parent 75c3d0bf9c
commit 2f450cc1fb
4 changed files with 8 additions and 16 deletions
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7
drivers/target/loopback/tcm_loop.c
View File

@ -953,11 +953,8 @@ static int tcm_loop_make_nexus(
transport_free_session(tl_nexus->se_sess); transport_free_session(tl_nexus->se_sess);
goto out; goto out;
} }
/* /* Now, register the SAS I_T Nexus as active. */
* Now, register the SAS I_T Nexus as active with the call to transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
* transport_register_session()
*/
__transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
tl_nexus->se_sess, tl_nexus); tl_nexus->se_sess, tl_nexus);
tl_tpg->tl_nexus = tl_nexus; tl_tpg->tl_nexus = tl_nexus;
pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"

5
drivers/usb/gadget/legacy/tcm_usb_gadget.c
View File

@ -1740,10 +1740,9 @@ static int tcm_usbg_make_nexus(struct usbg_tpg *tpg, char *name)
goto err_session; goto err_session;
} }
/* /*
* Now register the TCM vHost virtual I_T Nexus as active with the * Now register the TCM vHost virtual I_T Nexus as active.
* call to __transport_register_session()
*/ */
__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); tv_nexus->tvn_se_sess, tv_nexus);
tpg->tpg_nexus = tv_nexus; tpg->tpg_nexus = tv_nexus;
mutex_unlock(&tpg->tpg_mutex); mutex_unlock(&tpg->tpg_mutex);

5
drivers/vhost/scsi.c
View File

@ -1956,10 +1956,9 @@ static int vhost_scsi_make_nexus(struct vhost_scsi_tpg *tpg,
goto out; goto out;
} }
/* /*
* Now register the TCM vhost virtual I_T Nexus as active with the * Now register the TCM vhost virtual I_T Nexus as active.
* call to __transport_register_session()
*/ */
__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); tv_nexus->tvn_se_sess, tv_nexus);
tpg->tpg_nexus = tv_nexus; tpg->tpg_nexus = tv_nexus;

7
drivers/xen/xen-scsiback.c
View File

@ -1661,11 +1661,8 @@ static int scsiback_make_nexus(struct scsiback_tpg *tpg,
name); name);
goto out; goto out;
} }
/* /* Now register the TCM pvscsi virtual I_T Nexus as active. */
* Now register the TCM pvscsi virtual I_T Nexus as active with the transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
* call to __transport_register_session()
*/
__transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
tv_nexus->tvn_se_sess, tv_nexus); tv_nexus->tvn_se_sess, tv_nexus);
tpg->tpg_nexus = tv_nexus; tpg->tpg_nexus = tv_nexus;