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

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Message-id: <alpine.LFD.2.00.0911031401170.13333@xanadu.home>
Date:	Tue, 03 Nov 2009 14:58:10 -0500 (EST)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Alan Cox <alan@...ux.intel.com>
Cc:	linux-mmc@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/11] Sort out sdio_uart - stage two

On Tue, 3 Nov 2009, Alan Cox wrote:

> With the bugs Nicolas reported hopefully now nailed.

Progress, but still not there yet.

I'm still using the same "cat /dev/ttySDIO0" test with a GPS card.

Yanking the card out does terminate the cat process properly.  Inserting 
the card back in and restarting cat always fails with:

	cat: /dev/ttySDIO0: Input/output error

The same thing occurs if I terminate cat with ^C instead of pulling the 
card out.

>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 
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.


Nicolas
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