Re: [PATCH 00/11] Sort out sdio_uart - stage two

From: Nicolas Pitre
Date: Tue Nov 03 2009 - 14:58:17 EST

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.

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