[SRU][Zesty][PATCH 1/1] powerpc/npu-dma: Remove spurious WARN_ON when a PCI device has no of_node

[Joseph Salisbury]

From: Alistair Popple <alistair at popple.id.au>

BugLink: http://bugs.launchpad.net/bugs/1702768

Commit 4c3b89effc28 ("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.

Fixes: 4c3b89effc28 ("powerpc/powernv: Add sanity checks to pnv_pci_get_{gpu|npu}_dev")
Reported-by: Alexey Kardashevskiy <aik at ozlabs.ru>
Signed-off-by: Alistair Popple <alistair at popple.id.au>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
(cherry picked from commit 377aa6b0efbaa29cfeecd8b9244641217f9544ca)
Signed-off-by: Joseph Salisbury <joseph.salisbury at canonical.com>
---
 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 3184c9e..c10ad16 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 */
-- 
2.7.4