From: Thierry Reding <thierry.reding@gmail.com>
To: Sasha Levin <sashal@kernel.org>
Cc: Jon Hunter <jonathanh@nvidia.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Dmitry Osipenko <digetx@gmail.com>,
Wolfram Sang <wsa@the-dreams.de>,
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
Date: Mon, 27 Apr 2020 09:22:33 +0200 [thread overview]
Message-ID: <20200427072233.GB3451400@ulmo> (raw)
In-Reply-To: <20200424122237.9831-30-sashal@kernel.org>
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On Fri, Apr 24, 2020 at 08:22:28AM -0400, Sasha Levin wrote:
> From: Dmitry Osipenko <digetx@gmail.com>
>
> [ Upstream commit a900aeac253729411cf33c6cb598c152e9e4137f ]
>
> 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.
>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
> 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.
Thanks,
Thierry
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next prev parent reply other threads:[~2020-04-27 7:22 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-24 12:21 [PATCH AUTOSEL 5.6 01/38] libbpf: Initialize *nl_pid so gcc 10 is happy Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 02/38] net: fec: set GPR bit on suspend by DT configuration Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 03/38] x86: hyperv: report value of misc_features Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 04/38] signal: check sig before setting info in kill_pid_usb_asyncio Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 05/38] hwmon: (drivetemp) Use drivetemp's true module name in Kconfig section Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 06/38] hwmon: (drivetemp) Return -ENODATA for invalid temperatures Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 07/38] afs: Fix length of dump of bad YFSFetchStatus record Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 08/38] xfs: acquire superblock freeze protection on eofblocks scans Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 09/38] xfs: fix partially uninitialized structure in xfs_reflink_remap_extent Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 10/38] ALSA: hda: Release resources at error in delayed probe Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 11/38] ALSA: hda: Keep the controller initialization even if no codecs found Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 12/38] ALSA: hda: Skip controller resume if not needed Sasha Levin
2020-04-24 12:44 ` Takashi Iwai
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 13/38] ALSA: hda: Explicitly permit using autosuspend if runtime PM is supported Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 14/38] drm/amdgpu: fix wrong vram lost counter increment V2 Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 15/38] scsi: target: fix PR IN / READ FULL STATUS for FC Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 16/38] scsi: target: tcmu: reset_ring should reset TCMU_DEV_BIT_BROKEN Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 17/38] clk: asm9260: fix __clk_hw_register_fixed_rate_with_accuracy typo Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 18/38] efi/x86: Don't remap text<->rodata gap read-only for mixed mode Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 19/38] objtool: Fix CONFIG_UBSAN_TRAP unreachable warnings Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 20/38] objtool: Support Clang non-section symbols in ORC dump Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 21/38] xen/xenbus: ensure xenbus_map_ring_valloc() returns proper grant status Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 22/38] ALSA: hda: call runtime_allow() for all hda controllers Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 23/38] net: stmmac: socfpga: Allow all RGMII modes Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 24/38] net/cxgb4: Check the return from t4_query_params properly Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 25/38] mac80211: fix channel switch trigger from unknown mesh peer Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 26/38] sched/isolation: Allow "isolcpus=" to skip unknown sub-parameters Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 27/38] sched/vtime: Work around an unitialized variable warning Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 28/38] i2c: remove i2c_new_probed_device API Sasha Levin
2020-04-24 13:36 ` Wolfram Sang
2020-04-25 1:51 ` Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 29/38] arm64: Delete the space separator in __emit_inst Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 30/38] i2c: tegra: Better handle case where CPU0 is busy for a long time Sasha Levin
2020-04-27 7:22 ` Thierry Reding [this message]
2020-05-01 0:59 ` Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 31/38] i2c: tegra: Synchronize DMA before termination Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 32/38] ext4: use matching invalidatepage in ext4_writepage Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 33/38] ext4: increase wait time needed before reuse of deleted inode numbers Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 34/38] ext4: convert BUG_ON's to WARN_ON's in mballoc.c Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 35/38] irqchip/gic-v4.1: Add support for VPENDBASER's Dirty+Valid signaling Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 36/38] blk-mq: Put driver tag in blk_mq_dispatch_rq_list() when no budget Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 37/38] irqchip/meson-gpio: Fix HARDIRQ-safe -> HARDIRQ-unsafe lock order Sasha Levin
2020-04-24 12:22 ` [PATCH AUTOSEL 5.6 38/38] hwmon: (jc42) Fix name to have no illegal characters Sasha Levin
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