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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 <[email protected]>
Signed-off-by: Nicholas Bellinger <[email protected]>
This commit is contained in:
Bart Van Assche 2015-02-12 11:48:49 +01:00 • committed by Nicholas Bellinger
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);
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"