linux-kernel - [BUG] net: huawei: hinic: a possible sleep-in-atomic-context bug in msg_to_mgmt

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Date:   Fri, 11 Jan 2019 10:32:25 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     aviad.krawczyk@...wei.com, davem@...emloft.net
Cc:     netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] net: huawei: hinic: a possible sleep-in-atomic-context bug in
 msg_to_mgmt_async

The driver may sleep in an interrupt handler.
The function call path (from bottom to top) in the directory 
"drivers/net/ethernet/huawei/hinic/" in Linux-4.17 is:

[FUNC] down
hinic_hw_mgmt.c, 324: down in msg_to_mgmt_async
hinic_hw_mgmt.c, 408: msg_to_mgmt_async in mgmt_recv_msg_handler
hinic_hw_mgmt.c, 464:mgmt_recv_msg_handler in recv_mgmt_msg_handler
hinic_hw_mgmt.c, 484: recv_mgmt_msg_handler in mgmt_msg_aeqe_handler
hinic_hw_eqs.c, 264: [FUNC_PTR]mgmt_msg_aeqe_handler in aeq_irq_handler
hinic_hw_eqs.c, 355: aeq_irq_handler in eq_irq_handler
hinic_hw_eqs.c, 383: eq_irq_handler in ceq_tasklet

Note that [FUNC_PTR] means a function pointer call.

This bug is found by my static analysis tool (DSAC-2) and checked by my
manual code review.

I do not know how to correctly fix this bug, so I just report it.
A possible way may be to replace up() and down() with spin_lock() and 
spin_unlock().

Best wishes,
Jia-Ju Bai