linux-kernel - [PATCH v2 3/4] PCI: Export pci_dev

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Message-Id: <20210916093336.2895602-4-schnelle@linux.ibm.com>
Date:   Thu, 16 Sep 2021 11:33:35 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Linas Vepstas <linasvepstas@...il.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-pci@...r.kernel.org, Matthew Rosato <mjrosato@...ux.ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>
Subject: [PATCH v2 3/4] PCI: Export pci_dev_lock()

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@...ux.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 ce2ab62b64cf..6fe810fdb796 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5059,12 +5059,13 @@ static int pci_reset_bus_function(struct pci_dev *dev, bool 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 cd8aa6fce204..c27c8fd1d30c 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1671,6 +1671,7 @@ 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