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Message-Id: <1452023119-25647-183-git-send-email-kamal@canonical.com>
Date: Tue, 5 Jan 2016 11:44:50 -0800
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Pavel Machek <pavel@....cz>,
"David S. Miller" <davem@...emloft.net>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 182/211] atl1c: Improve driver not to do order 4 GFP_ATOMIC allocation
4.2.8-ckt1 -stable 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: Kamal Mostafa <kamal@...onical.com>
---
drivers/net/ethernet/atheros/atl1c/atl1c_main.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
index 932bd18..6e9036a 100644
--- a/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
+++ b/drivers/net/ethernet/atheros/atl1c/atl1c_main.c
@@ -1014,13 +1014,12 @@ static int atl1c_setup_ring_resources(struct atl1c_adapter *adapter)
sizeof(struct atl1c_recv_ret_status) * rx_desc_count +
8 * 4;
- 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);
--
1.9.1
--
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