linux-kernel - Re: [PATCH V2 1/4] spi: lpspi: Fix kernel warning dump when probe fail after calling spi

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Message-ID: <20200727111109.GB6275@sirena.org.uk>
Date:   Mon, 27 Jul 2020 12:11:09 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Clark Wang <xiaoning.wang@....com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/4] spi: lpspi: Fix kernel warning dump when probe
 fail after calling spi_register

On Mon, Jul 27, 2020 at 11:14:46AM +0800, Clark Wang wrote:
> Calling devm_spi_register_controller() too early will cause problem.
> When probe failed occurs after calling devm_spi_register_controller(),
> the call of spi_controller_put() will trigger the following warning dump.
> 
> [    2.092138] ------------[ cut here ]------------
> [    2.096876] kernfs: can not remove 'uevent', no directory
> [    2.102440] WARNING: CPU: 0 PID: 181 at fs/kernfs/dir.c:1503 kernfs_remove_by_name_ns+0xa0/0xb0
> [    2.111142] Modules linked in:
> [    2.114207] CPU: 0 PID: 181 Comm: kworker/0:7 Not tainted 5.4.24-05024-g775c6e8a738c-dirty #1314
> [    2.122991] Hardware name: Freescale i.MX8DXL EVK (DT)
> [    2.128141] Workqueue: events deferred_probe_work_func

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message. If part of the backtrace is usefully illustrative (it often is
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the relevant sections.

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