From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: njavali@marvell.com, mrangankar@marvell.com,
GR-QLogic-Storage-Upstream@marvell.com, jejb@linux.ibm.com,
martin.petersen@oracle.com
Cc: linux-scsi@vger.kernel.org, linux-kernel <linux-kernel@vger.kernel.org>
Subject: [BUG] scsi: qedi: possible ABBA deadlock in qedi_process_tmf_resp() and qedi_process_cmd_cleanup_resp()
Date: Tue, 8 Feb 2022 19:23:01 +0800 [thread overview]
Message-ID: <e468fdcb-f47f-e01a-da65-68da79020165@gmail.com> (raw)
Hello,
My static analysis tool reports a possible ABBA deadlock in the qedi
driver in Linux 5.16:
qedi_process_tmf_resp()
spin_lock(&session->back_lock); --> Line 201 (Lock A)
spin_lock(&qedi_conn->tmf_work_lock); --> Line 230 (Lock B)
qedi_process_cmd_cleanup_resp()
spin_lock_bh(&qedi_conn->tmf_work_lock); --> Line 752 (Lock B)
spin_lock_bh(&conn->session->back_lock); --> Line 784 (Lock A)
When qedi_process_tmf_resp() and qedi_process_cmd_cleanup_resp() are
concurrently executed, the deadlock can occur.
I am not quite sure whether this possible deadlock is real and how to
fix it if it is real.
Any feedback would be appreciated, thanks :)
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Best wishes,
Jia-Ju Bai
next reply other threads:[~2022-02-08 11:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-08 11:23 Jia-Ju Bai [this message]
2022-02-08 17:10 ` [BUG] scsi: qedi: possible ABBA deadlock in qedi_process_tmf_resp() and qedi_process_cmd_cleanup_resp() Mike Christie
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