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Subject[PATCH] PCI: Factor functions of PCI function reset
Date
Previosly we use pci_probe_reset_function() to probe whehter a function
can be reset and use __pci_reset_function_locked() to perform a function
reset. These two functions have lots of common lines.

Factor the two functions and reduce the redundancy.

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
---
drivers/pci/pci.c | 61 ++++++++++++++++-------------------------------------
drivers/pci/pci.h | 2 +-
drivers/pci/probe.c | 2 +-
3 files changed, 20 insertions(+), 45 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e39c549..e3e5f0f 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5006,9 +5006,11 @@ static void pci_dev_restore(struct pci_dev *dev)
}

/**
- * __pci_reset_function_locked - reset a PCI device function while holding
- * the @dev mutex lock.
+ * pci_probe_reset_function - check whether the device can be safely reset
+ * or reset a PCI device function while holding
+ * the @dev mutex lock.
* @dev: PCI device to reset
+ * @probe: Probe or not whether the device can be reset.
*
* Some devices allow an individual function to be reset without affecting
* other functions in the same device. The PCI device must be responsive
@@ -5022,10 +5024,10 @@ static void pci_dev_restore(struct pci_dev *dev)
* device including MSI, bus mastering, BARs, decoding IO and memory spaces,
* etc.
*
- * Returns 0 if the device function was successfully reset or negative if the
- * device doesn't support resetting a single function.
+ * Returns 0 if the device function can be reset or was successfully reset.
+ * negative if the device doesn't support resetting a single function.
*/
-int __pci_reset_function_locked(struct pci_dev *dev)
+int pci_probe_reset_function(struct pci_dev *dev, int probe)
{
int rc;

@@ -5039,61 +5041,34 @@ int __pci_reset_function_locked(struct pci_dev *dev)
* other error, we're also finished: this indicates that further
* reset mechanisms might be broken on the device.
*/
- rc = pci_dev_specific_reset(dev, 0);
+ rc = pci_dev_specific_reset(dev, probe);
if (rc != -ENOTTY)
return rc;
if (pcie_has_flr(dev)) {
+ if (probe)
+ return 0;
rc = pcie_flr(dev);
if (rc != -ENOTTY)
return rc;
}
- rc = pci_af_flr(dev, 0);
+ rc = pci_af_flr(dev, probe);
if (rc != -ENOTTY)
return rc;
- rc = pci_pm_reset(dev, 0);
+ rc = pci_pm_reset(dev, probe);
if (rc != -ENOTTY)
return rc;
- rc = pci_dev_reset_slot_function(dev, 0);
+ rc = pci_dev_reset_slot_function(dev, probe);
if (rc != -ENOTTY)
return rc;
- return pci_parent_bus_reset(dev, 0);
+
+ return pci_parent_bus_reset(dev, probe);
}
-EXPORT_SYMBOL_GPL(__pci_reset_function_locked);

-/**
- * pci_probe_reset_function - check whether the device can be safely reset
- * @dev: PCI device to reset
- *
- * Some devices allow an individual function to be reset without affecting
- * other functions in the same device. The PCI device must be responsive
- * to PCI config space in order to use this function.
- *
- * Returns 0 if the device function can be reset or negative if the
- * device doesn't support resetting a single function.
- */
-int pci_probe_reset_function(struct pci_dev *dev)
+int __pci_reset_function_locked(struct pci_dev *dev)
{
- int rc;
-
- might_sleep();
-
- rc = pci_dev_specific_reset(dev, 1);
- if (rc != -ENOTTY)
- return rc;
- if (pcie_has_flr(dev))
- return 0;
- rc = pci_af_flr(dev, 1);
- if (rc != -ENOTTY)
- return rc;
- rc = pci_pm_reset(dev, 1);
- if (rc != -ENOTTY)
- return rc;
- rc = pci_dev_reset_slot_function(dev, 1);
- if (rc != -ENOTTY)
- return rc;
-
- return pci_parent_bus_reset(dev, 1);
+ return pci_probe_reset_function(dev, 0);
}
+EXPORT_SYMBOL_GPL(__pci_reset_function_locked);

/**
* pci_reset_function - quiesce and reset a PCI device function
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index fa12f7c..73740dd 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -39,7 +39,7 @@ enum pci_mmap_api {
int pci_mmap_fits(struct pci_dev *pdev, int resno, struct vm_area_struct *vmai,
enum pci_mmap_api mmap_api);

-int pci_probe_reset_function(struct pci_dev *dev);
+int pci_probe_reset_function(struct pci_dev *dev, int probe);
int pci_bridge_secondary_bus_reset(struct pci_dev *dev);
int pci_bus_error_reset(struct pci_dev *dev);

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 03d3712..793cc8a 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2403,7 +2403,7 @@ static void pci_init_capabilities(struct pci_dev *dev)

pcie_report_downtraining(dev);

- if (pci_probe_reset_function(dev) == 0)
+ if (pci_probe_reset_function(dev, 1) == 0)
dev->reset_fn = 1;
}

--
2.8.1
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