Re: [PATCH] sound: fix hang in mpu401_uart.c

[Jon Masters]

On 4/18/06, Takashi Iwai <tiwai@xxxxxxx> wrote:

> > +             if ((err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))) {
> > +                     return -EFAULT;
>
> IMO, -EFAULT isn't a good choice for this kind of error.

What would you suggest?

> >       if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
> >               return err;
> >       if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
> > -             snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1);
> > -             snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1);
> > +             if ((err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1)))
> > +                     return -EFAULT;
> > +             if ((err = snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 1)))
> > +                     return -EFAULT;

> Missing close in the error path?

I'll respin the patch later, but first, what should I return on open
when the underlying hardware is not there?

Jon.
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