diff mbox series

[1/2] vmxnet3: Fix inconsistent DMA accesses in vmxnet3_probe_device()

Message ID 20241113200001.3567479-2-bjohannesmeyer@gmail.com (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series vmxnet3: Fix inconsistent DMA accesses | expand

Checks

Context Check Description
netdev/series_format warning Target tree name not specified in the subject
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 3 this patch: 3
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 7 of 7 maintainers
netdev/build_clang success Errors and warnings before: 3 this patch: 3
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 18 this patch: 18
netdev/checkpatch warning CHECK: Alignment should match open parenthesis
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-11-14--03-00 (tests: 782)

Commit Message

Brian Johannesmeyer Nov. 13, 2024, 8 p.m. UTC 
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@gmail.com>
Signed-off-by: Raphael Isemann <teemperor@gmail.com>
Signed-off-by: Brian Johannesmeyer <bjohannesmeyer@gmail.com>
---
 drivers/net/vmxnet3/vmxnet3_drv.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index 7fa74b8b2100..cc76134c7db4 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,
+	dev = &adapter->pdev->dev;
+	adapter_pa = dma_map_single(dev, adapter,
 					     sizeof(struct vmxnet3_adapter),
 					     DMA_TO_DEVICE);
-	if (dma_mapping_error(&adapter->pdev->dev, adapter->adapter_pa)) {
+	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 +3935,8 @@  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: