[PATCH v3 9/9] PCI/AER: Refine status clearing process with api

Zhuo Chen
2022-09-28T11:02:48Z

Statements clearing status in aer_enable_rootport() is functionally
equivalent with pcie_clear_device_status() and pci_aer_clear_status().
So replace them, which has no functional changes.

After commit 20e15e673b05 ("PCI/AER: Add pci_aer_raw_clear_status()
to unconditionally clear Error Status"), pci_aer_raw_clear_status()
is only used by the EDR path, so we add note in function comment.

Signed-off-by: Zhuo Chen <chenzhuo.1@bytedance.com>
---
drivers/pci/pcie/aer.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index a6d29269ccf2..bd5ecfa4860f 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -306,6 +306,8 @@ EXPORT_SYMBOL_GPL(pci_aer_clear_uncorrect_error_status);
* Clearing AER error status registers unconditionally, regardless of
* whether they're owned by firmware or the OS.
*
+ * Used only by the EDR path. Other paths should use pci_aer_clear_status().
+ *
* Returns 0 on success, or negative on failure.
*/
int pci_aer_raw_clear_status(struct pci_dev *dev)
@@ -1277,24 +1279,17 @@ static void aer_enable_rootport(struct aer_rpc *rpc)
{
struct pci_dev *pdev = rpc->rpd;
int aer = pdev->aer_cap;
- u16 reg16;
u32 reg32;

/* Clear PCIe Capability's Device Status */
- pcie_capability_read_word(pdev, PCI_EXP_DEVSTA, &reg16);
- pcie_capability_write_word(pdev, PCI_EXP_DEVSTA, reg16);
+ pcie_clear_device_status(pdev);

/* Disable system error generation in response to error messages */
pcie_capability_clear_word(pdev, PCI_EXP_RTCTL,
SYSTEM_ERROR_INTR_ON_MESG_MASK);

/* Clear error status */
- pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, &reg32);
- pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, reg32);
- pci_read_config_dword(pdev, aer + PCI_ERR_COR_STATUS, &reg32);
- pci_write_config_dword(pdev, aer + PCI_ERR_COR_STATUS, reg32);
- pci_read_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, &reg32);
- pci_write_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, reg32);
+ pci_aer_clear_status(pdev);

/*
* Enable error reporting for the root port device and downstream port
--
2.30.1 (Apple Git-130)