netdev - Re: [PATCH] net: stmmac: Don't call _irqoff() with hardirqs enabled

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Message-ID: <20201009101241.qr6blbfyamtuzrwy@skbuf>
Date:   Fri, 9 Oct 2020 13:12:41 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     John Keeping <john@...anate.com>
Cc:     netdev@...r.kernel.org,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: Don't call _irqoff() with hardirqs enabled

On Fri, Oct 09, 2020 at 10:59:45AM +0100, John Keeping wrote:
> No, it's not, although I would have saved several days debugging if it
> was!  I backported the lockdep warning to prove that it caught this
> issue.
>
> The evidence it is possible to see on vanilla 5.4.x is:
>
> 	$ trace-cmd report -l
> 	irq/43-e-280     0....2    74.017658: softirq_raise:        vec=3 [action=NET_RX]
>
> Note the missing "d" where this should be "0d...2" to indicate hardirqs
> disabled.

Cool, makes sense.