linux-kernel - Re: [PATCH] 8250/16?50: Add support for Broadcom TruManage redirected serial port

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Date:	Tue, 29 Jan 2013 17:06:24 +0200
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, shurd@...adcom.com,
	mchan@...adcom.com
Subject: Re: [PATCH] 8250/16?50: Add support for Broadcom TruManage redirected serial port

Michael Chan <mchan@...adcom.com> writes:

> From: Stephen Hurd <shurd@...adcom.com>
>
> Add support for the UART device present in Broadcom TruManage capable
> NetXtreme chips (ie: 5761m 5762, and 5725).
>
> This implementation has a hidden transmit FIFO, so running in single-byte
> interrupt mode results in too many interrupts.  The UART_CAP_HFIFO
> capability was added to track this.  It continues to reload the THR as long
> as the THRE and TSRE bits are set in the LSR up to a specified limit (1024
> is used here).
>
> Signed-off-by: Stephen Hurd <shurd@...adcom.com>
> Signed-off-by: Michael Chan <mchan@...adcom.com>

Greg, this looks like a new feature, yet it was applied to -rc5 and
stable. Any reason for that? I'm asking because this patch doesn't seem
to have received enough reviewing/testing:

[skip platform bits]

> diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
> index 78f99d9..2c6c85f 100644
> --- a/include/uapi/linux/serial_core.h
> +++ b/include/uapi/linux/serial_core.h
> @@ -50,7 +50,8 @@
>  #define PORT_LPC3220	22	/* NXP LPC32xx SoC "Standard" UART */
>  #define PORT_8250_CIR	23	/* CIR infrared port, has its own driver */
>  #define PORT_XR17V35X	24	/* Exar XR17V35x UARTs */
> -#define PORT_MAX_8250	24	/* max port ID */
> +#define PORT_BRCM_TRUMANAGE	24
> +#define PORT_MAX_8250	25	/* max port ID */

This is a bug, TRUMANAGE should be 25 as well as PORT_MAX_8250.

Regards,
--
Alex
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