linux-kernel - Re: [PATCH V1 1/1] serial: 8250_fintek: Fix crash with baud rate B0

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Date:   Wed, 8 Nov 2017 17:34:14 +0000
From:   Alan Cox <gnomes@...rguk.ukuu.org.uk>
To:     "Ji-Ze Hong (Peter Hong)" <hpeter@...il.com>
Cc:     gregkh@...uxfoundation.org, jslaby@...e.com, lukas@...ner.de,
        rel+kernel@...lox.net, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org, ricardo.ribalda@...il.com,
        "Ji-Ze Hong (Peter Hong)" <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH V1 1/1] serial: 8250_fintek: Fix crash with baud rate B0

On Wed,  8 Nov 2017 11:05:46 +0800
"Ji-Ze Hong (Peter Hong)" <hpeter@...il.com> wrote:

> The 8250_fintek.c is support the Fintek F81866/F81216 with dynamic clock.
> But It'll generate "division by zero" exception and crash in
> fintek_8250_set_termios() with baud rate 0 on baudrate_table[i] % baud.

0 means "hang up", so this looks good providing it leaves the device in a
sane state.


Reviewed-by: Alan Cox <alan@...ux.intel.com>