Previously we used pci_probe_reset_function() to probe whether 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@xxxxxxxxxxxxx> --- Change since v1: - reword the comments a bit(Krzysztof) - fix typos in the commit(Bjorn) Link: https://lore.kernel.org/linux-pci/1605090123-14243-1-git-send-email-yangyicong@xxxxxxxxxxxxx/ drivers/pci/pci.c | 62 ++++++++++++++++------------------------------------- drivers/pci/pci.h | 2 +- drivers/pci/probe.c | 2 +- 3 files changed, 21 insertions(+), 45 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 16a1721..254bbe9 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5055,9 +5055,11 @@ 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 @@ -5071,10 +5073,11 @@ 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, otherwise 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; @@ -5088,61 +5091,34 @@ 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 ef7c466..f349d48 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 953f15a..cc0c21d 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -2404,7 +2404,7 @@ 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
