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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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5
drivers/usb/gadget/legacy/tcm_usb_gadget.c
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@ -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);