[PATCH 4/5] PCI: Export pci_dev_lock()
From: Niklas Schnelle <schnelle@linux.ibm.com>
Date: 2021-09-06 09:49:53
Also in:
linux-s390, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
Commit e3a9b1212b9d ("PCI: Export pci_dev_trylock() and pci_dev_unlock()")
already exported pci_dev_trylock()/pci_dev_unlock() however in some
circumstances such as during error recovery it makes sense to block
waiting to get full access to the device so also export pci_dev_lock().
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
---
drivers/pci/pci.c | 3 ++-
include/linux/pci.h | 1 +
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index aacf575c15cf..3f416c6d3b0b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c@@ -5040,12 +5040,13 @@ static int pci_reset_bus_function(struct pci_dev *dev, int probe) return pci_parent_bus_reset(dev, probe); } -static void pci_dev_lock(struct pci_dev *dev) +void pci_dev_lock(struct pci_dev *dev) { pci_cfg_access_lock(dev); /* block PM suspend, driver probe, etc. */ device_lock(&dev->dev); } +EXPORT_SYMBOL_GPL(pci_dev_lock); /* Return 1 on successful lock, 0 on contention */ int pci_dev_trylock(struct pci_dev *dev)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index ea0e23dbc8ec..efc78b8d4696 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h@@ -1639,6 +1639,7 @@ void pci_cfg_access_lock(struct pci_dev *dev); bool pci_cfg_access_trylock(struct pci_dev *dev); void pci_cfg_access_unlock(struct pci_dev *dev); +void pci_dev_lock(struct pci_dev *dev); int pci_dev_trylock(struct pci_dev *dev); void pci_dev_unlock(struct pci_dev *dev);
--
2.25.1