[V2,1/7] PCI: protect restore with device lock to be consistent

Message ID 1511763628-11856-2-git-send-email-okaya@codeaurora.org
State New
Delegated to: Bjorn Helgaas
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Series
  • [V2,1/7] PCI: protect restore with device lock to be consistent
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Commit Message

Sinan Kaya Nov. 27, 2017, 6:20 a.m.
Commit b014e96d1abb ("PCI: Protect pci_error_handlers->reset_notify() usage
with device_lock()") added protection around pci_dev_restore() function so
that device specific remove callback does not cause a race condition
against hotplug.

pci_dev_lock() usage has been forgotten in two different places in the
code. Adding locks for pci_slot_restore() and moving pci_dev_restore()
inside the locks for pci_try_reset_function().

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/pci/pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Comments

Christoph Hellwig Nov. 29, 2017, 5:36 p.m. | #1
On Mon, Nov 27, 2017 at 01:20:22AM -0500, Sinan Kaya wrote:
> Commit b014e96d1abb ("PCI: Protect pci_error_handlers->reset_notify() usage
> with device_lock()") added protection around pci_dev_restore() function so
> that device specific remove callback does not cause a race condition
> against hotplug.
> 
> pci_dev_lock() usage has been forgotten in two different places in the
> code. Adding locks for pci_slot_restore() and moving pci_dev_restore()
> inside the locks for pci_try_reset_function().
> 
> Signed-off-by: Sinan Kaya <okaya@codeaurora.org>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>

Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 6078dfc..23681f4 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4344,9 +4344,9 @@  int pci_try_reset_function(struct pci_dev *dev)
 
 	pci_dev_save_and_disable(dev);
 	rc = __pci_reset_function_locked(dev);
+	pci_dev_restore(dev);
 	pci_dev_unlock(dev);
 
-	pci_dev_restore(dev);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(pci_try_reset_function);
@@ -4546,7 +4546,9 @@  static void pci_slot_restore(struct pci_slot *slot)
 	list_for_each_entry(dev, &slot->bus->devices, bus_list) {
 		if (!dev->slot || dev->slot != slot)
 			continue;
+		pci_dev_lock(dev);
 		pci_dev_restore(dev);
+		pci_dev_unlock(dev);
 		if (dev->subordinate)
 			pci_bus_restore(dev->subordinate);
 	}