linux-kernel - [PATCH 3.18 002/121] IB/srpt: Fix abort handling

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Date:   Wed, 11 Apr 2018 20:35:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Hannes Reinecke <hare@...e.com>,
        Doug Ledford <dledford@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Andy Grover <agrover@...hat.com>,
        David Disseldorp <ddiss@...e.de>,
        Nicholas Bellinger <nab@...ux-iscsi.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 002/121] IB/srpt: Fix abort handling

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bart.vanassche@...disk.com>


[ Upstream commit 55d694275f41a1c0eef4ef49044ff29bc3999490 ]

Let the target core check the CMD_T_ABORTED flag instead of the SRP
target driver. Hence remove the transport_check_aborted_status()
call. Since state == SRPT_STATE_CMD_RSP_SENT is something that really
should not happen, do not try to recover if srpt_queue_response() is
called for an I/O context that is in that state. This patch is a bug
fix because the srpt_abort_cmd() call is misplaced - if that function
is called from srpt_queue_response() it should either be called
before the command state is changed or after the response has been
sent.

Signed-off-by: Bart Van Assche <bart.vanassche@...disk.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Cc: Doug Ledford <dledford@...hat.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Andy Grover <agrover@...hat.com>
Cc: David Disseldorp <ddiss@...e.de>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/infiniband/ulp/srpt/ib_srpt.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -2986,12 +2986,8 @@ static void srpt_queue_response(struct s
 	}
 	spin_unlock_irqrestore(&ioctx->spinlock, flags);
 
-	if (unlikely(transport_check_aborted_status(&ioctx->cmd, false)
-		     || WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))) {
-		atomic_inc(&ch->req_lim_delta);
-		srpt_abort_cmd(ioctx);
+	if (unlikely(WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT)))
 		return;
-	}
 
 	dir = ioctx->cmd.data_direction;