From: Dan Carpenter <dan.carpenter@oracle.com>
To: Wei Yongjun <weiyongjun1@huawei.com>
Cc: Jeff Dike <jdike@addtoit.com>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
linux-um@lists.infradead.org, netdev@vger.kernel.org,
bpf@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [PATCH -next] um: vector: use GFP_ATOMIC under spin lock
Date: Thu, 28 Nov 2019 11:06:41 +0300 [thread overview]
Message-ID: <20191128080641.GD1781@kadam> (raw)
In-Reply-To: <20191128020147.191893-1-weiyongjun1@huawei.com>
On Thu, Nov 28, 2019 at 02:01:47AM +0000, 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@huawei.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))
^^^^^^^^^^^^^^^^
Is it really possible to call request_firmware() while holding a
spin_lock? I was so sure that read from the disk.
regards,
dan carpenter
> 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;
>
>
next prev parent reply other threads:[~2019-11-28 8:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-28 2:01 [PATCH -next] um: vector: use GFP_ATOMIC under spin lock Wei Yongjun
2019-11-28 7:51 ` Anton Ivanov
2019-11-28 8:06 ` Dan Carpenter [this message]
2019-11-28 8:18 ` Anton Ivanov
2019-11-28 8:37 ` Dan Carpenter
2019-11-28 9:22 ` Anton Ivanov
2019-11-28 8:41 ` Richard Weinberger
2019-11-28 9:24 ` Anton Ivanov
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