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IB/srp: Remove target from list before freeing Scsi_Host structure 

Remove an SRP target from the SRP target list before invoking the last
scsi_host_put() call.  This change is necessary because that last put
frees the memory that holds the srp_target_port structure.

This patch prevents the following kernel oops:

    RIP: 0010:[<ffffffff810b00d0>] __lock_acquire+0x500/0x1570
    Call Trace:
     [<ffffffff810b11e4>] lock_acquire+0xa4/0x120
     [<ffffffff81531206>] _spin_lock+0x36/0x70
     [<ffffffffa01b6d8f>] srp_remove_work+0xef/0x180 [ib_srp]
     [<ffffffff8109125c>] worker_thread+0x21c/0x3d0
     [<ffffffff81096e86>] kthread+0x96/0xa0
     [<ffffffff8100c20a>] child_rip+0xa/0x20

Signed-off-by: Vu Pham <vuhuong@mellanox.com>

[ bvanassche - Modified path description and CC'ed stable. ]

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>
hifive-unleashed-5.1
Vu Pham 2013-10-10 13:50:29 +02:00 committed by Roland Dreier
parent 71444b9781
commit 65d7dd2f34
1 changed files with 5 additions and 4 deletions
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9
drivers/infiniband/ulp/srp/ib_srp.c
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@ -666,6 +666,11 @@ static void srp_remove_target(struct srp_target_port *target)
cancel_work_sync(&target->tl_err_work);
srp_rport_put(target->rport);
srp_free_req_data(target);
spin_lock(&target->srp_host->target_lock);
list_del(&target->list);
spin_unlock(&target->srp_host->target_lock);
scsi_host_put(target->scsi_host);
}
@ -677,10 +682,6 @@ static void srp_remove_work(struct work_struct *work)
WARN_ON_ONCE(target->state != SRP_TARGET_REMOVED);
srp_remove_target(target);
spin_lock(&target->srp_host->target_lock);
list_del(&target->list);
spin_unlock(&target->srp_host->target_lock);
}
static void srp_rport_delete(struct srp_rport *rport)