From: David Laight <David.Laight@ACULAB.COM>
To: 'Mikko Perttunen' <mperttunen@nvidia.com>,
"ldewangan@nvidia.com" <ldewangan@nvidia.com>,
"digetx@gmail.com" <digetx@gmail.com>,
"thierry.reding@gmail.com" <thierry.reding@gmail.com>,
"jonathanh@nvidia.com" <jonathanh@nvidia.com>,
"wsa@kernel.org" <wsa@kernel.org>
Cc: "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: RE: [PATCH] i2c: tegra: Wait for config load atomically while in ISR
Date: Mon, 11 Jan 2021 14:31:36 +0000 [thread overview]
Message-ID: <a0b0f224c2864b80a5bac53646d67daf@AcuMS.aculab.com> (raw)
In-Reply-To: <20210111135547.3613092-1-mperttunen@nvidia.com>
From: Mikko Perttunen
> Sent: 11 January 2021 13:56
>
> Upon a communication error, the interrupt handler can call
> tegra_i2c_disable_packet_mode. This causes a sleeping poll to happen
> unless the current transaction was marked atomic. Since
> tegra_i2c_disable_packet_mode is only called from the interrupt path,
> make it use atomic waiting always.
Spin-waiting in an ISR for anything that it makes sense to do
a sleep-wait for at other times is badly broken design.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2021-01-11 14:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-11 13:55 [PATCH] i2c: tegra: Wait for config load atomically while in ISR Mikko Perttunen
2021-01-11 14:31 ` David Laight [this message]
2021-01-11 14:38 ` Mikko Perttunen
2021-01-11 15:14 ` Dmitry Osipenko
2021-01-11 15:52 ` Mikko Perttunen
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