linux-kernel - [PATCH 3.2 67/77] atl1c: Improve driver not to do order 4 GFP

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Date:	Thu, 24 Dec 2015 15:37:42 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>,
	"Michal Hocko" <mhocko@...e.com>, "Pavel Machek" <pavel@....cz>
Subject: [PATCH 3.2 67/77] atl1c: Improve driver not to do order 4
 GFP_ATOMIC  allocation

3.2.75-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Pavel Machek <pavel@....cz>

[ Upstream commit f2a3771ae8aca879c32336c76ad05a017629bae2 ]

atl1c driver is doing order-4 allocation with GFP_ATOMIC
priority. That often breaks  networking after resume. Switch to
GFP_KERNEL. Still not ideal, but should be significantly better.

atl1c_setup_ring_resources() is called from .open() function, and
already uses GFP_KERNEL, so this change is safe.

Signed-off-by: Pavel Machek <pavel@....cz>
Acked-by: Michal Hocko <mhocko@...e.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/ethernet/atheros/atl1c/atl1c_main.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -981,13 +981,12 @@ static int atl1c_setup_ring_resources(st
 		sizeof(struct atl1c_hw_stats) +
 		8 * 4 + 8 * 2 * num_rx_queues;
 
-	ring_header->desc = pci_alloc_consistent(pdev, ring_header->size,
-				&ring_header->dma);
+	ring_header->desc = dma_zalloc_coherent(&pdev->dev, ring_header->size,
+						&ring_header->dma, GFP_KERNEL);
 	if (unlikely(!ring_header->desc)) {
-		dev_err(&pdev->dev, "pci_alloc_consistend failed\n");
+		dev_err(&pdev->dev, "could not get memory for DMA buffer\n");
 		goto err_nomem;
 	}
-	memset(ring_header->desc, 0, ring_header->size);
 	/* init TPD ring */
 
 	tpd_ring[0].dma = roundup(ring_header->dma, 8);

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