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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-04-24 21:15:18 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-05-01 00:47:26 +0200 |
| commit | 977f857ca566a1e68045fcbb7cfc9c4acb077cf0 (patch) | |
| tree | eca7bfd254d2beca6da23cf28e03a50c3d214707 /drivers/pci | |
| parent | Linux 3.4-rc4 (diff) | |
| download | linux-977f857ca566a1e68045fcbb7cfc9c4acb077cf0.tar.xz linux-977f857ca566a1e68045fcbb7cfc9c4acb077cf0.zip | |
PCI: move mutex locking out of pci_dev_reset function
The intent of git commit 6fbf9e7a90862988c278462d85ce9684605a52b2
"PCI: Introduce __pci_reset_function_locked to be used when holding
device_lock." was to have a non-locking function that would call
pci_dev_reset function.
But it fell short of that by just probing and not actually reseting
the device. To make that work we need a way to move the lock
around device_lock to not be in pci_dev_reset (as the caller of
__pci_reset_function_locked already holds said lock). We do this by
renaming pci_dev_reset to __pci_dev_reset and bubbling said mutex out
of __pci_dev_reset to pci_dev_reset (a wrapper around __pci_dev_reset).
The __pci_reset_function_locked can now call __pci_dev_reset without
having to worry about the dead-lock.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 111569ccab43..9e31c0ab650e 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3164,18 +3164,12 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe) return 0; } -static int pci_dev_reset(struct pci_dev *dev, int probe) +static int __pci_dev_reset(struct pci_dev *dev, int probe) { int rc; might_sleep(); - if (!probe) { - pci_cfg_access_lock(dev); - /* block PM suspend, driver probe, etc. */ - device_lock(&dev->dev); - } - rc = pci_dev_specific_reset(dev, probe); if (rc != -ENOTTY) goto done; @@ -3194,14 +3188,27 @@ static int pci_dev_reset(struct pci_dev *dev, int probe) rc = pci_parent_bus_reset(dev, probe); done: + return rc; +} + +static int pci_dev_reset(struct pci_dev *dev, int probe) +{ + int rc; + + if (!probe) { + pci_cfg_access_lock(dev); + /* block PM suspend, driver probe, etc. */ + device_lock(&dev->dev); + } + + rc = __pci_dev_reset(dev, probe); + if (!probe) { device_unlock(&dev->dev); pci_cfg_access_unlock(dev); } - return rc; } - /** * __pci_reset_function - reset a PCI device function * @dev: PCI device to reset @@ -3246,7 +3253,7 @@ EXPORT_SYMBOL_GPL(__pci_reset_function); */ int __pci_reset_function_locked(struct pci_dev *dev) { - return pci_dev_reset(dev, 1); + return __pci_dev_reset(dev, 0); } EXPORT_SYMBOL_GPL(__pci_reset_function_locked); |