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From: Greg Kroah-Hartman <>
To: Sudip Mukherjee <>
Cc: Wander Lairson Costa <>,
	Linus Torvalds <>,, Jiri Slaby <>,
Subject: Re: Regression with 5021d709b31b ("tty: serial: Use fifo in 8250 console driver")
Date: Fri, 28 Jan 2022 08:15:16 +0100	[thread overview]
Message-ID: <YfOYBLz7/> (raw)
In-Reply-To: <YfMpk7DM9zA7NfmI@debian>

On Thu, Jan 27, 2022 at 11:24:03PM +0000, Sudip Mukherjee wrote:
> Hi Wander,
> Not sure if this has been reported before but since last few weeks I am
> seeing a problem with the rpi4 serial port on my test setup. The initial
> boot message will be completely garbled as you can see at:
> The last good boot was
> The bisect log:
> # bad: [455e73a07f6e288b0061dfcf4fcf54fa9fe06458] Merge tag 'clk-for-linus' of git://
> # good: [7e7b69654724c72bd3219b71f58937845dca0b2b] Merge tag 'dma-mapping-5.17' of git://
> git bisect start '455e73a07f6e288b0061dfcf4fcf54fa9fe06458' '7e7b69654724c72bd3219b71f58937845dca0b2b'
> # bad: [342465f5337f7bd5b8bd3b6f939ac12b620cbb43] Merge tag 'tty-5.17-rc1' of git://
> git bisect bad 342465f5337f7bd5b8bd3b6f939ac12b620cbb43
> # good: [6dc69d3d0d18d587ab9d809fe060ba4417cf0279] Merge tag 'driver-core-5.17-rc1' of git://
> git bisect good 6dc69d3d0d18d587ab9d809fe060ba4417cf0279
> # good: [e269f7acdc53623769da31135f60afeb3a65eaff] staging: r8188eu: remove the private ioctl "wps_assoc_req_ie"
> git bisect good e269f7acdc53623769da31135f60afeb3a65eaff
> # bad: [ad234e2bac274a43c9fa540bde8cd9f0c627b71f] tty: serial: meson: Drop the legacy compatible strings and clock code
> git bisect bad ad234e2bac274a43c9fa540bde8cd9f0c627b71f
> # good: [c66453ce8af8bac78a72ba4e21fd9a86720127d7] tty: fix kernel-doc in n_tty.c
> git bisect good c66453ce8af8bac78a72ba4e21fd9a86720127d7
> # good: [0882b473b084df31288003b3bee974aabac9dcf9] tty: serial: samsung: Enable console as module
> git bisect good 0882b473b084df31288003b3bee974aabac9dcf9
> # bad: [b4a29b94804c4774f22555651296b838df6ec0e4] serial: 8250: Move Alpha-specific quirk out of the core
> git bisect bad b4a29b94804c4774f22555651296b838df6ec0e4
> # good: [e822b4973f49015e1c6f63b91c8641ed9bfaf229] tty/ldsem: Fix syntax errors in comments
> git bisect good e822b4973f49015e1c6f63b91c8641ed9bfaf229
> # good: [fb09d0ac07725b442b32dbf53f0ab0bea54804e9] tty: Fix the keyboard led light display problem
> git bisect good fb09d0ac07725b442b32dbf53f0ab0bea54804e9
> # bad: [5021d709b31b8a14317998a33cbc78be0de9ab30] tty: serial: Use fifo in 8250 console driver
> git bisect bad 5021d709b31b8a14317998a33cbc78be0de9ab30
> # good: [adbfddc757aec1ed54ccb35c4a7ca9170df827e0] docs/driver-api: Replace a comma in the n_gsm.rst with a double colon
> git bisect good adbfddc757aec1ed54ccb35c4a7ca9170df827e0
> # first bad commit: [5021d709b31b8a14317998a33cbc78be0de9ab30] tty: serial: Use fifo in 8250 console driver
> And, indeed reverting 5021d709b31b ("tty: serial: Use fifo in 8250 console
> driver") on top of 23a46422c561 ("Merge tag 'net-5.17-rc2' of
> git://") fixes the problem
> for me.

Thanks, but this is already reverted in my tree and will go to Linus
later today.

greg k-h

  parent reply	other threads:[~2022-01-28  7:15 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-27 23:24 Sudip Mukherjee
2022-01-28  4:59 ` Thorsten Leemhuis
2022-01-28  7:15 ` Greg Kroah-Hartman [this message]
2022-01-28 12:30 ` Wander Costa
2022-01-31 12:58   ` Sudip Mukherjee
2022-01-31 13:22     ` Wander Costa

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