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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-07-16 12:01:42 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2012-07-16 12:01:42 -0400 |
| commit | 8626e4a42675ff9903f7d4fbf14d8ebc11b5926c (patch) | |
| tree | c631dfe2854cb1382a5d8f5aa11b071762ddf27d /drivers/pci/pci-driver.c | |
| parent | a8d8f02cf0c379693762107afe812b9e52090e39 (diff) | |
| parent | 9249e17fe094d853d1ef7475dd559a2cc7e23d42 (diff) | |
Merge commit '9249e17fe094d853d1ef7475dd559a2cc7e23d42' into nfs-for-3.6
Resolve conflicts with the VFS atomic open and sget changes.
Conflicts:
fs/nfs/nfs4proc.c
Diffstat (limited to 'drivers/pci/pci-driver.c')
| -rw-r--r-- | drivers/pci/pci-driver.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index bf0cee629b6..099f46cd8e8 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -748,6 +748,18 @@ static int pci_pm_suspend_noirq(struct device *dev) pci_pm_set_unknown_state(pci_dev); + /* + * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's + * PCI COMMAND register isn't 0, the BIOS assumes that the controller + * hasn't been quiesced and tries to turn it off. If the controller + * is already in D3, this can hang or cause memory corruption. + * + * Since the value of the COMMAND register doesn't matter once the + * device has been suspended, we can safely set it to 0 here. + */ + if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI) + pci_write_config_word(pci_dev, PCI_COMMAND, 0); + return 0; } |