netdev - Re: [REGRESSION] Re: [PATCH v2] net: fec: Use a spinlock to guard `fep->ptp_clk

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Date:   Thu, 22 Sep 2022 12:58:53 +0200
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     regressions@...ts.linux.dev
Cc:     netdev@...r.kernel.org
Subject: Re: [REGRESSION] Re: [PATCH v2] net: fec: Use a spinlock to guard
 `fep->ptp_clk_on` #forregzbot

On 18.09.22 20:59, Thorsten Leemhuis wrote:
> TWIMC: this mail is primarily send for documentation purposes and for
> regzbot, my Linux kernel regression tracking bot. These mails usually
> contain '#forregzbot' in the subject, to make them easy to spot and filter.
> 
> On 14.09.22 15:53, Guenter Roeck wrote:
>> On Thu, Sep 01, 2022 at 04:04:03PM +0200, Csókás Bence wrote:
>>> Mutexes cannot be taken in a non-preemptible context,
>>> causing a panic in `fec_ptp_save_state()`. Replacing
>>> `ptp_clk_mutex` by `tmreg_lock` fixes this.
>>>
>>> Fixes: 6a4d7234ae9a ("net: fec: ptp: avoid register access when ipg clock is disabled")
>>> Fixes: f79959220fa5 ("fec: Restart PPS after link state change")
>>> Reported-by: Marc Kleine-Budde <mkl@...gutronix.de>
>>> Link: https://lore.kernel.org/all/20220827160922.642zlcd5foopozru@pengutronix.de/
>>> Signed-off-by: Csókás Bence <csokas.bence@...lan.hu>
>>
>> For regzbot:
> 
> Thanks for the report. To be sure below issue doesn't fall through the
> cracks unnoticed, I'm adding it to regzbot, my Linux kernel regression
> tracking bot:
> 
> #regzbot ^introduced b353b241f1eb9b626
> #regzbot title net: fec: backtrace: BUG: sleeping function called from
> invalid context at drivers/clk/imx/clk-pllv3.c
> #regzbot ignore-activity
> #regzbot monitor:
> https://lore.kernel.org/all/20220912073106.2544207-1-bence98@sch.bme.hu/
> #regzbot monitor:
> https://lore.kernel.org/all/20220912070143.98153-1-francesco.dolcini@toradex.com/

#regzbot fixed-by: 01b825f997ac28f