At Sun, 16 Apr 2006 04:12:36 +0100,
Jon Masters wrote:
>
> From: Jon Masters <[email protected]>
>
> This fixes a hang in mpu401_uart.c that can occur when the mpu401
> interface is non-existent or otherwise doesn't respond to commands but
> we issue IO anyway. snd_mpu401_uart_cmd now returns an error code that is
> passed up the stack so that an open() will fail immediately in such cases.
>
> Eventually discovered after wine/cxoffice would constantly cause hard
> lockups on my desktop immediately after loading (emulating Windows too
> well). Turned out that I'd recently moved my sound cards around and
> using /dev/sequencer now talks to a sound card with a broken MPU.
>
> Signed-off-by: Jon Masters <[email protected]>
(snip)
> @@ -235,8 +238,12 @@
> if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
> return err;
> if (! test_bit(MPU401_MODE_BIT_OUTPUT, &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;
IMO, -EFAULT isn't a good choice for this kind of error.
> @@ -252,8 +259,10 @@
> 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?
Takashi
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