linux-kernel - Re: [PATCH] serial/8250: remove comment about schedule

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Date:   Thu, 5 Jan 2017 16:40:16 +0000
From:   One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:     Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Cc:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        Russell King <rmk+kernel@...linux.org.uk>,
        "Theodore Ts'o" <tytso@....edu>
Subject: Re: [PATCH] serial/8250: remove comment about schedule_timeout

On Thu,  5 Jan 2017 13:48:40 -0200
Thadeu Lima de Souza Cascardo <cascardo@...onical.com> wrote:

> Ted T'so has added the function size_fifo in 1999 for the 2.3 series
> [1], a long time ago.
> 
> During the 2.5 cycle, Russell King has restructured the serial drivers
> and, in that process, has suggested using schedule_timeout instead of
> mdelay in size_fifo. [2]
> 
> It was only at 2.6.7 that Greg Kroah-Hartman added the msleep function
> to the core kernel, as people were starting to duplicate it. [3]
> 
> However, as size_fifo is called under a spinlock from the autoconfig
> function, we might not use msleep here, so removing that comment is the
> appropriate thing to do.

No.. it's still a flaw in the driver that we can't use msleep here. It's
one of those things that people want to know if the probe locking ever
gets restructured.

Alan