linux-kernel - RE: BUG: sleeping function called from invalid context in __might

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Message-Id: <20230420082153.6711-1-daniel.starke@siemens.com>
Date:   Thu, 20 Apr 2023 10:21:53 +0200
From:   "D. Starke" <daniel.starke@...mens.com>
To:     jirislaby@...nel.org
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        yhao016@....edu
Subject: RE: BUG: sleeping function called from invalid context in __might_resched

> Hmm, tty_operations::write() is documented as "not allowed to sleep". 
> But vt's write was always sleeping :D. I wonder:
> 1) can gsmld be switched to a mutex?
> 2) what do other ldiscs do? FWIW n_tty does mutex, so allows ::write() 
> to sleep.

There was already a failed attempt to solve this in the past. But this is
not an easy issue and involves the complete outgoing data flow of the
driver.

Link: https://lore.kernel.org/all/20221205190806.179857803@linuxfoundation.org/

Best regards,
Daniel Starke