diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-11 11:53:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-11 11:53:31 -0700 |
| commit | 1e032dc59b66b62d2776f30fb231a0a568146fda (patch) | |
| tree | d5bbcfca577305f2e72f7be9f344dca8de770830 /drivers/pci/pci-driver.c | |
| parent | 5f351f0637777d01465e43c4426096905fe0ca21 (diff) | |
| parent | dbf0e4c7257f8d684ec1a3c919853464293de66e (diff) | |
Merge tag 'usb-3.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB fixes from Greg Kroah-Hartman:
"Here are a few fixes and new device ids for the 3.5-rc6 tree.
The PCI changes resolve a long-standing issue with resuming some EHCI
controllers. It has been acked by the PCI maintainer, and he asked
for it to go through my USB tree instead of his.
The xhci patches also resolve a number of reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
* tag 'usb-3.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
PCI: EHCI: fix crash during suspend on ASUS computers
USB: cdc-wdm: fix lockup on error in wdm_read
USB: metro-usb: fix tty_flip_buffer_push use
USB: option: Add MEDIATEK product ids
USB: option: add ZTE MF60
xhci: Fix hang on back-to-back Set TR Deq Ptr commands.
usb: Add support for root hub port status CAS
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; } |