netdev - Aw: [PATCH] [v8] net: emac: emac gigabit ethernet controller driver

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Date:	Fri, 12 Aug 2016 22:22:58 +0200
From:	"Lino Sanfilippo" <LinoSanfilippo@....de>
To:	"Timur Tabi" <timur@...eaurora.org>
Cc:	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, sdharia@...eaurora.org,
	shankerd@...eaurora.org, vikrams@...eaurora.org,
	cov@...eaurora.org, gavidov@...eaurora.org, robh+dt@...nel.org,
	andrew@...n.ch, bjorn.andersson@...aro.org, mlangsdo@...hat.com,
	jcm@...hat.com, agross@...eaurora.org, davem@...emloft.net,
	f.fainelli@...il.com
Subject: Aw: [PATCH] [v8] net: emac: emac gigabit ethernet controller driver

Hi,

I really dont want to be a killjoy, but...

> +		int ret;
> +
> +		skb = __netdev_alloc_skb_ip_align(adpt->netdev,
> +						  adpt->rxbuf_size, GFP_KERNEL);

This is also called in softirq context by the napi handler in which GFP_KERNEL is
not allowed.
You can either extend the refill function by one gfp_t parameter and then call it 
with GFP_KERNEL for the initial rx buffer allocation when the hw is brought up and 
then with GFP_ATOMIC for refilling in the NAPI handler. Or simply always use GFP_ATOMIC.
In the latter case the additional parameter is not needed of course and you can
use netdev_alloc_skb_ip_align() instead of __netdev_alloc_skb_ip_align().

Regards,
Lino