linux-kernel - Re: [PATCH] staging:iio:adc:ad7280a: Use GFP

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Date:   Fri, 29 Jun 2018 07:05:17 +0200
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Karim Eshapa <karim.eshapa@...il.com>
Cc:     Michael.Hennerich@...log.com, jic23@...nel.org, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging:iio:adc:ad7280a: Use GFP_ATOMIC in interrupt
 handler

On 06/29/2018 01:55 AM, Karim Eshapa wrote:
> Use GFP_ATOMIC rather GFP_KERNEL in interrupt handler,
> as GFP_KERNEL may sleep according to slab allocator.

This is a threaded interrupt. Sleeping is OK.

> 
> Signed-off-by: Karim Eshapa <karim.eshapa@...il.com>
> ---
>  drivers/staging/iio/adc/ad7280a.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
> index b736275c10f5..25c4fbc303f7 100644
> --- a/drivers/staging/iio/adc/ad7280a.c
> +++ b/drivers/staging/iio/adc/ad7280a.c
> @@ -692,7 +692,7 @@ static irqreturn_t ad7280_event_handler(int irq, void *private)
>  	unsigned int *channels;
>  	int i, ret;
>  
> -	channels = kcalloc(st->scan_cnt, sizeof(*channels), GFP_KERNEL);
> +	channels = kcalloc(st->scan_cnt, sizeof(*channels), GFP_ATOMIC);
>  	if (!channels)
>  		return IRQ_HANDLED;
>  
>