Re: [PATCH] spi: core: Don't destroy master queue if we fail to create it

[Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>]

On Thu, May 1, 2014 at 7:49 PM, Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:
> From: Mark Brown <broonie-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
>
> If we fail to create the master queue for some reason we should not attempt
> to clean it up since attempting to stop a kthread that was not created will
> hang and it's just generally bad practice. Unfortunately at present we call
> spi_destroy_queue() even in cases where the creation fails.
>
> Fix this by fixing the error handling in spi_master_initialize_queue() so
> that we only flag the master as queued or destroy the queue if creation
> succeeded. The change to the flag is done since the general master
> cleanup uses this to destroy the queue.
>
> Reported-by: Ricardo Ribalda Delgado <ricardo.ribalda-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Mark Brown <broonie-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> ---
>
> This has been compile tested only but it should hopefully be more robust
> in the long term than just skipping the queue deletion inside the
> destructor.
>
>  drivers/spi/spi.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> index 38ba75a..bc42e27 100644
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -1151,7 +1151,6 @@ static int spi_master_initialize_queue(struct spi_master *master)
>  {
>         int ret;
>
> -       master->queued = true;
>         master->transfer = spi_queued_transfer;
>         if (!master->transfer_one_message)
>                 master->transfer_one_message = spi_transfer_one_message;
> @@ -1162,6 +1161,7 @@ static int spi_master_initialize_queue(struct spi_master *master)
>                 dev_err(&master->dev, "problem initializing queue\n");
>                 goto err_init_queue;

You can just "return ret;" here...

>         }
> +       master->queued = true;
>         ret = spi_start_queue(master);
>         if (ret) {
>                 dev_err(&master->dev, "problem starting queue\n");
> @@ -1171,8 +1171,8 @@ static int spi_master_initialize_queue(struct spi_master *master)
>         return 0;
>
>  err_start_queue:
> -err_init_queue:
>         spi_destroy_queue(master);
> +err_init_queue:

... and kill the err_init_queue label.

>         return ret;
>  }

Apart from that:
Acked-by: Geert Uytterhoeven <geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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