linux-kernel - Re: [PATCH 2/2] Staging: pi433: check error after kthread

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Date:   Wed, 19 Jul 2017 21:41:31 +0200 (CEST)
From:   Marcus Wolf <marcus.wolf@...f-entwicklungen.de>
To:     Joseph Wright <rjosephwright@...il.com>, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org
Subject: Re: [PATCH 2/2] Staging: pi433: check error after kthread_run()

Hi Joseph,

tested your patch and didn't observe a problem.

Thanks for your help :-)

Marcus

> Joseph Wright <rjosephwright@...il.com> hat am 16. Juli 2017 um 16:48
> geschrieben:
>
>
> Error should be checked with IS_ERR after calling kthread_run()
> instead of comparing the returned pointer to an int.
>
> Found by sparse warning:
>
> incompatible types for operation (<)
> left side has type struct task_struct *tx_task_struct
> right side has type int
>
> Signed-off-by: Joseph Wright <rjosephwright@...il.com>
> ---
> drivers/staging/pi433/pi433_if.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/staging/pi433/pi433_if.c
> b/drivers/staging/pi433/pi433_if.c
> index 46461b4..4f724a5 100644
> --- a/drivers/staging/pi433/pi433_if.c
> +++ b/drivers/staging/pi433/pi433_if.c
> @@ -1152,7 +1152,7 @@ static int pi433_probe(struct spi_device *spi)
> device->tx_task_struct = kthread_run(pi433_tx_thread,
> device,
> "pi433_tx_task");
> - if (device->tx_task_struct < 0)
> + if (IS_ERR(device->tx_task_struct))
> {
> dev_dbg(device->dev, "start of send thread failed");
> goto send_thread_failed;
> --
> 2.9.3
>
>