target: Don't BUG_ON during NodeACL dynamic -> explicit conversion
authorNicholas Bellinger <nab@linux-iscsi.org>
Sun, 23 Oct 2016 21:28:15 +0000 (14:28 -0700)
committerNicholas Bellinger <nab@linux-iscsi.org>
Wed, 8 Feb 2017 15:46:31 +0000 (07:46 -0800)
commit391e2a6de9781e4906dd7e0b1cc097050bf43e11
tree42ebf04325bc226435f330a75677dbe141f26a0b
parentd5adbfcd5f7bcc6fa58a41c5c5ada0e5c826ce2c
target: Don't BUG_ON during NodeACL dynamic -> explicit conversion

After the v4.2+ RCU conversion to se_node_acl->lun_entry_hlist,
a BUG_ON() was added in core_enable_device_list_for_node() to
detect when the located orig->se_lun_acl contains an existing
se_lun_acl pointer reference.

However, this scenario can happen when a dynamically generated
NodeACL is being converted to an explicit NodeACL, when the
explicit NodeACL contains a different LUN mapping than the
default provided by the WWN endpoint.

So instead of triggering BUG_ON(), go ahead and fail instead
following the original pre RCU conversion logic.

Reported-by: Benjamin ESTRABAUD <ben.estrabaud@mpstor.com>
Cc: Benjamin ESTRABAUD <ben.estrabaud@mpstor.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org # 4.2+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
drivers/target/target_core_device.c