netdev - Re: [PATCH -next] um: vector: use GFP_ATOMIC under spin lock

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Date:   Thu, 28 Nov 2019 07:51:06 +0000
From:   Anton Ivanov <anton.ivanov@...bridgegreys.com>
To:     Wei Yongjun <weiyongjun1@...wei.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>
Cc:     kernel-janitors@...r.kernel.org, linux-um@...ts.infradead.org,
        bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH -next] um: vector: use GFP_ATOMIC under spin lock

On 28/11/2019 02:01, Wei Yongjun wrote:
> A spin lock is taken here so we should use GFP_ATOMIC.
> 
> Fixes: 9807019a62dc ("um: Loadable BPF "Firmware" for vector drivers")
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
> ---
>   arch/um/drivers/vector_kern.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/um/drivers/vector_kern.c b/arch/um/drivers/vector_kern.c
> index 92617e16829e..6ff0065a271d 100644
> --- a/arch/um/drivers/vector_kern.c
> +++ b/arch/um/drivers/vector_kern.c
> @@ -1402,7 +1402,7 @@ static int vector_net_load_bpf_flash(struct net_device *dev,
>   		kfree(vp->bpf->filter);
>   		vp->bpf->filter = NULL;
>   	} else {
> -		vp->bpf = kmalloc(sizeof(struct sock_fprog), GFP_KERNEL);
> +		vp->bpf = kmalloc(sizeof(struct sock_fprog), GFP_ATOMIC);
>   		if (vp->bpf == NULL) {
>   			netdev_err(dev, "failed to allocate memory for firmware\n");
>   			goto flash_fail;
> @@ -1414,7 +1414,7 @@ static int vector_net_load_bpf_flash(struct net_device *dev,
>   	if (request_firmware(&fw, efl->data, &vdevice->pdev.dev))
>   		goto flash_fail;
>   
> -	vp->bpf->filter = kmemdup(fw->data, fw->size, GFP_KERNEL);
> +	vp->bpf->filter = kmemdup(fw->data, fw->size, GFP_ATOMIC);
>   	if (!vp->bpf->filter)
>   		goto free_buffer;
> 
> 
> 
> 

Acked-by: Anton Ivanov <anton.ivanov@...bridgegreys.co.uk>

> _______________________________________________
> linux-um mailing list
> linux-um@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-um
> 


-- 
Anton R. Ivanov
Cambridgegreys Limited. Registered in England. Company Number 10273661
https://www.cambridgegreys.com/

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