linux-kernel - Re: [PATCH] net: mscc: ocelot: replace readx_poll_timeout with readx_poll_timeout

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Message-Id: <20200516.135336.2032300090729040507.davem@davemloft.net>
Date:   Sat, 16 May 2020 13:53:36 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     xulin.sun@...driver.com
Cc:     alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        xulinsun@...il.com
Subject: Re: [PATCH] net: mscc: ocelot: replace readx_poll_timeout with
 readx_poll_timeout_atomic

From: Xulin Sun <xulin.sun@...driver.com>
Date: Fri, 15 May 2020 11:18:13 +0800

> BUG: sleeping function called from invalid context at drivers/net/ethernet/mscc/ocelot.c:59
> in_atomic(): 1, irqs_disabled(): 0, pid: 3778, name: ifconfig
> INFO: lockdep is turned off.
> Preemption disabled at:
> [<ffff2b163c83b78c>] dev_set_rx_mode+0x24/0x40
> Hardware name: LS1028A RDB Board (DT)
> Call trace:
> dump_backtrace+0x0/0x140
> show_stack+0x24/0x30
> dump_stack+0xc4/0x10c
> ___might_sleep+0x194/0x230
> __might_sleep+0x58/0x90
> ocelot_mact_forget+0x74/0xf8
> ocelot_mc_unsync+0x2c/0x38
> __hw_addr_sync_dev+0x6c/0x130
> ocelot_set_rx_mode+0x8c/0xa0

Vladimir states that this call chain is not possible in mainline.

I'm not applying this.