netdev - [RFC v2 1/2] vmxnet3: Fix inconsistent DMA accesses in vmxnet3_probe

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Message-Id: <20241119221353.3912257-3-bjohannesmeyer@gmail.com>
Date: Tue, 19 Nov 2024 23:13:53 +0100
From: Brian Johannesmeyer <bjohannesmeyer@...il.com>
To: Ronak Doshi <ronak.doshi@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Brian Johannesmeyer <bjohannesmeyer@...il.com>,
	Raphael Isemann <teemperor@...il.com>,
	Cristiano Giuffrida <giuffrida@...vu.nl>,
	Herbert Bos <h.j.bos@...nl>
Subject: [RFC v2 1/2] vmxnet3: Fix inconsistent DMA accesses in vmxnet3_probe_device()

After mapping `adapter` to streaming DMA, but before accessing it,
synchronize it to the CPU. Then, before returning, synchronize it back to
the device. This mitigates any inconsistent accesses to it from
vmxnet3_probe_device().

Co-developed-by: Raphael Isemann <teemperor@...il.com>
Signed-off-by: Raphael Isemann <teemperor@...il.com>
Signed-off-by: Brian Johannesmeyer <bjohannesmeyer@...il.com>
---
 drivers/net/vmxnet3/vmxnet3_drv.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index 7fa74b8b2100..032d3cd34be1 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -3623,6 +3623,8 @@ vmxnet3_probe_device(struct pci_dev *pdev,
 	int num_rx_queues;
 	int queues;
 	unsigned long flags;
+	struct device *dev;
+	dma_addr_t adapter_pa;
 
 	if (!pci_msi_enabled())
 		enable_mq = 0;
@@ -3662,14 +3664,19 @@ vmxnet3_probe_device(struct pci_dev *pdev,
 	}
 
 	spin_lock_init(&adapter->cmd_lock);
-	adapter->adapter_pa = dma_map_single(&adapter->pdev->dev, adapter,
-					     sizeof(struct vmxnet3_adapter),
-					     DMA_TO_DEVICE);
-	if (dma_mapping_error(&adapter->pdev->dev, adapter->adapter_pa)) {
+	dev = &adapter->pdev->dev;
+	adapter_pa = dma_map_single(dev, adapter,
+				    sizeof(struct vmxnet3_adapter),
+				    DMA_TO_DEVICE);
+	if (dma_mapping_error(dev, adapter_pa)) {
 		dev_err(&pdev->dev, "Failed to map dma\n");
 		err = -EFAULT;
 		goto err_set_mask;
 	}
+	dma_sync_single_for_cpu(dev, adapter_pa,
+				sizeof(struct vmxnet3_adapter), DMA_TO_DEVICE);
+	adapter->adapter_pa = adapter_pa;
+
 	adapter->shared = dma_alloc_coherent(
 				&adapter->pdev->dev,
 				sizeof(struct Vmxnet3_DriverShared),
@@ -3928,6 +3935,9 @@ vmxnet3_probe_device(struct pci_dev *pdev,
 	}
 
 	vmxnet3_check_link(adapter, false);
+	dma_sync_single_for_device(dev, adapter_pa,
+				   sizeof(struct vmxnet3_adapter),
+				   DMA_TO_DEVICE);
 	return 0;
 
 err_register:
-- 
2.34.1