Re: [REGRESSION next-20170426] Commit 09515ef5ddad ("of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices") causes oops in mvneta

[Sricharan R]

Hi Ralph,

On 4/27/2017 7:05 PM, Sricharan R wrote:
> Hi,
> 
> On 4/26/2017 9:45 PM, Ralph Sennhauser wrote:
>> Hi Sricharan R,
>>
>> Commit 09515ef5ddad ("of/acpi: Configure dma operations at probe time
>> for platform/amba/pci bus devices") causes a kernel panic as in the log
>> below on an armada-385. Reverting the commit fixes the issue.
>>
>> Regards
>> Ralph
> 
> Somehow not getting a obvious clue on whats going wrong with the logs
> below. From the log and looking in to dts, the drivers seems to the one for
> "marvell,armada-370-neta". Issue looks the data from the dma has gone bad
> and subsequently referring the wrong data has resulted in the crash.
> Looks like the dma_masks is the one going wrong.
> Can i get some logs from mvneta_probe, about dev->dma_mask,
> dev->coherent_dma_mask and dev->dma_ops with and without the patch
> to see whats the difference ?
> 

Attached the patch with debug prints.

Regards,
 Sricharan
From fe77d3968d6bc35b46e5f30d5c67c7603aa10597 Mon Sep 17 00:00:00 2001
From: Sricharan R <sricharan@xxxxxxxxxxxxxx>
Date: Fri, 28 Apr 2017 09:43:26 +0530
Subject: [PATCH] Debug prints

Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx>
---
 drivers/net/ethernet/marvell/mvneta.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index d297011..250f0b2 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -4146,6 +4146,12 @@ static int mvneta_probe(struct platform_device *pdev)
 	int phy_mode;
 	int err;
 	int cpu;
+	struct device *ddev = &pdev->dev;
+
+
+	dev_err(ddev, "dev->dma_mask 0x%llx\n", *(ddev->dma_mask));
+	dev_err(ddev, "dev->coherent_dma_mask 0x%llx\n", ddev->coherent_dma_mask);
+	dev_err(ddev, "dev->dma_ops 0x%llx\n", ddev->dma_ops);
 
 	dev = alloc_etherdev_mqs(sizeof(struct mvneta_port), txq_number, rxq_number);
 	if (!dev)
-- 
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