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[46.91.237.186]) by smtp.gmail.com with ESMTPSA id i74sm2222631wri.49.2020.04.27.00.22.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Apr 2020 00:22:35 -0700 (PDT) Date: Mon, 27 Apr 2020 09:22:33 +0200 From: Thierry Reding To: Sasha Levin Cc: Jon Hunter , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Dmitry Osipenko , Wolfram Sang , linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org Subject: Re: [PATCH AUTOSEL 5.6 30/38] i2c: tegra: Better handle case where CPU0 is busy for a long time Message-ID: <20200427072233.GB3451400@ulmo> References: <20200424122237.9831-1-sashal@kernel.org> <20200424122237.9831-30-sashal@kernel.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="A6N2fC+uXW/VQSAv" Content-Disposition: inline In-Reply-To: <20200424122237.9831-30-sashal@kernel.org> User-Agent: Mutt/1.13.1 (2019-12-14) Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org --A6N2fC+uXW/VQSAv Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Apr 24, 2020 at 08:22:28AM -0400, Sasha Levin wrote: > From: Dmitry Osipenko >=20 > [ Upstream commit a900aeac253729411cf33c6cb598c152e9e4137f ] >=20 > Boot CPU0 always handle I2C interrupt and under some rare circumstances > (like running KASAN + NFS root) it may stuck in uninterruptible state for > a significant time. In this case we will get timeout if I2C transfer is > running on a sibling CPU, despite of IRQ being raised. In order to handle > this rare condition, the IRQ status needs to be checked after completion > timeout. >=20 > Signed-off-by: Dmitry Osipenko > Signed-off-by: Wolfram Sang > Signed-off-by: Sasha Levin > --- > drivers/i2c/busses/i2c-tegra.c | 27 +++++++++++++++------------ > 1 file changed, 15 insertions(+), 12 deletions(-) Hi Sasha, can you drop this from the v5.6 stable queue please? Jon discovered that this patch introduces a regression in v5.7, and since we don't have a good understanding of why this is breaking things I think it'd be best if we reverted it for v5.7 until we come up with a good fix. I think the same applies for the other i2c/tegra patch that's 31/38 of this series. 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