Thread (3 messages) flat view 3 messages, 3 authors, 2017-06-15

Re: [PATCH] powernv/npu-dma.c: Remove spurious WARN_ON when a PCI device has no of_node

From: Alexey Kardashevskiy <hidden>
Date: 2017-06-15 01:52:30

On 14/06/17 14:47, Alistair Popple wrote:
"4c3b89e powerpc/powernv: Add sanity checks to pnv_pci_get_{gpu|npu}_dev"
introduced explicit warnings in pnv_pci_get_npu_dev() when a PCIe device
has no associated device-tree node. However not all PCIe devices have an
of_node and pnv_pci_get_npu_dev() gets indirectly called at least once for
every PCIe device in the system. This results in spurious WARN_ON()'s so
remove it.

The same situation should not exist for pnv_pci_get_gpu_dev() as any NPU
based PCIe device requires a device-tree node.

Signed-off-by: Alistair Popple <redacted>
Reported-by: Alexey Kardashevskiy <redacted>
Reviewed-by: Alexey Kardashevskiy <redacted>
quoted hunk ↗ jump to hunk
---
 arch/powerpc/platforms/powernv/npu-dma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/powernv/npu-dma.c b/arch/powerpc/platforms/powernv/npu-dma.c
index 78fa939..e6f444b 100644
--- a/arch/powerpc/platforms/powernv/npu-dma.c
+++ b/arch/powerpc/platforms/powernv/npu-dma.c
@@ -75,7 +75,8 @@ struct pci_dev *pnv_pci_get_npu_dev(struct pci_dev *gpdev, int index)
 	if (WARN_ON(!gpdev))
 		return NULL;
 
-	if (WARN_ON(!gpdev->dev.of_node))
+	/* Not all PCI devices have device-tree nodes */
+	if (!gpdev->dev.of_node)
 		return NULL;
 
 	/* Get assoicated PCI device */

-- 
Alexey
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