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Date: Sun, 20 Sep 2026 06:17:21 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Hui Peng <benquike@gmail.com>
Cc: jirislaby@kernel.org, john.ogness@linutronix.de,
	linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] serial: fix 8250 hash_mutex race and
 uart_get_baud_rate() divide-by-zero
Message-ID: <2026092001-judicial-coherence-46a5@gregkh>
References: <20260919222627.3797854-1-benquike@gmail.com>
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In-Reply-To: <20260919222627.3797854-1-benquike@gmail.com>

On Sat, Sep 19, 2026 at 10:26:27PM +0000, Hui Peng wrote:
> Fix two bugs in the serial subsystem:
> 
> 1. In serial8250_Label / serial_link_irq_chain() and
>    serial_unlink_irq_chain() (drivers/tty/serial/8250/8250_core.c), hold
>    hash_mutex across the entire IRQ list manipulation and
>    request_irq()/free_irq() sequence to prevent racing IRQ chain
>    insertions/removals.
> 2. In uart_get_baud_rate() and uart_set_info()
>    (drivers/tty/serial/serial_core.c), avoid unsigned overflow in
>    port->uartclk = new_info->baud_base * 16 and ensure the fallback
>    retry in uart_get_baud_rate() terminates cleanly when no baud rate
>    lies in [min, max].

Then this should be 2 different patches, right?

Please slow down.

thanks,

greg k-h