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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-01-12 12:06:46 -0500
committerJesse Barnes <jbarnes@virtuousgeek.org>2012-02-14 08:44:48 -0800
commit6fbf9e7a90862988c278462d85ce9684605a52b2 (patch)
treeccc79061bac41537c37f5edc73bdc5bc59005c8a /include/linux/pci.h
parent8f0cdddcd3f270901765fc909c3aee37a2091e78 (diff)
downloadop-kernel-dev-6fbf9e7a90862988c278462d85ce9684605a52b2.zip
op-kernel-dev-6fbf9e7a90862988c278462d85ce9684605a52b2.tar.gz
PCI: Introduce __pci_reset_function_locked to be used when holding device_lock.
The use case of this is when a driver wants to call FLR when a device is attached to it using the SysFS "bind" or "unbind" functionality. The call chain when a user does "bind" looks as so: echo "0000:01.07.0" > /sys/bus/pci/drivers/XXXX/bind and ends up calling: driver_bind: device_lock(dev); <=== TAKES LOCK XXXX_probe: .. pci_enable_device() ...__pci_reset_function(), which calls pci_dev_reset(dev, 0): if (!0) { device_lock(dev) <==== DEADLOCK The __pci_reset_function_locked function allows the the drivers 'probe' function to call the "pci_reset_function" while still holding the driver mutex lock. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'include/linux/pci.h')
-rw-r--r--include/linux/pci.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 4afabb1..f442760 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -816,6 +816,7 @@ int pcie_set_readrq(struct pci_dev *dev, int rq);
int pcie_get_mps(struct pci_dev *dev);
int pcie_set_mps(struct pci_dev *dev, int mps);
int __pci_reset_function(struct pci_dev *dev);
+int __pci_reset_function_locked(struct pci_dev *dev);
int pci_reset_function(struct pci_dev *dev);
void pci_update_resource(struct pci_dev *dev, int resno);
int __must_check pci_assign_resource(struct pci_dev *dev, int i);
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