linux-kernel - Re: [PATCH 00/11] Sort out sdio_uart

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Date:	Wed, 4 Nov 2009 00:54:32 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Nicolas Pitre <nico@...xnic.net>
Cc:	Alan Cox <alan@...ux.intel.com>, linux-mmc@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/11] Sort out sdio_uart - stage two

> >From what I can see, sdio_uart_open() and sdio_uart_activate() are 
> called on the first cat invocation, and then sdio_uart_close() and 
> sdio_uart_shutdown() when cat is stopped with ^C.  However neither 

I would have expected the cat to terminate when the port is unplugged
(and the uart remove method called - doing a hangup)

> sdio_uart_open() nor sdio_uart_activate() is ever called anymore with 
> any subsequent cat invocations until a reboot.  Some upper layer must 
> have taken upon itself to return -EIO to user space.

The first call into the driver is to sdio_uart_install which looks up the
port from tty->index and would blow up if for some reason the get method
failed.

Still digging.
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