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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2010-12-28 13:08:42 -0800
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2011-01-14 15:51:51 -0800
commita6d940dd759bf240d28624198660ed34582a327b (patch)
tree4a6ce6ef72bb872a9f0a94933b3d6f749b58538e /drivers/usb
parent653a39d1f61bdc9f277766736d21d2e9be0391cb (diff)
downloadop-kernel-dev-a6d940dd759bf240d28624198660ed34582a327b.zip
op-kernel-dev-a6d940dd759bf240d28624198660ed34582a327b.tar.gz
xhci: Use GFP_NOIO during device reset.
When xhci_discover_or_reset_device() is called after a host controller power loss, the virtual device may need to be reallocated. Make sure xhci_alloc_dev() uses GFP_NOIO. This avoid causing a deadlock by allowing the kernel to flush pending I/O while reallocating memory for a virtual device for a USB mass storage device that's holding the backing store for dirty memory buffers. This patch should be queued for the 2.6.37 stable tree. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable@kernel.org
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/xhci.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index b2c56d1..34cf4e1 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -2431,8 +2431,12 @@ int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
xhci_err(xhci, "Error while assigning device slot ID\n");
return 0;
}
- /* xhci_alloc_virt_device() does not touch rings; no need to lock */
- if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_KERNEL)) {
+ /* xhci_alloc_virt_device() does not touch rings; no need to lock.
+ * Use GFP_NOIO, since this function can be called from
+ * xhci_discover_or_reset_device(), which may be called as part of
+ * mass storage driver error handling.
+ */
+ if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_NOIO)) {
/* Disable slot, if we can do it without mem alloc */
xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
spin_lock_irqsave(&xhci->lock, flags);
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