netdev - [BUG] might sleep functions in atomic context in stmmac

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Date:	Sat, 17 May 2014 03:15:54 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Srinivas Kandagatla <srinivas.kandagatla@...com>
CC:	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ldv-project@...uxtesting.org
Subject: [BUG] might sleep functions in atomic context in stmmac_resume()

There are calls to might sleep functions in atomic context in
stmmac_resume():
- the first one is clk_prepare_enable(priv->stmmac_clk);
- the second one is stmmac_hw_setup()
-> init_dma_desc_rings()
  -> stmmac_init_rx_buffers()
    -> __netdev_alloc_skb(GFP_KERNEL)

What is the purpose of spin_lock_irqsave(&priv->lock, flags) section?
What does it protect against?

Found by Linux Driver Verification project (linuxtesting.org).

--
Alexey Khoroshilov
Linux Verification Center, ISPRAS
web: http://linuxtesting.org
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