diff options
| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2010-12-28 22:08:42 +0100 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2011-01-15 00:51:51 +0100 |
| commit | a6d940dd759bf240d28624198660ed34582a327b (patch) | |
| tree | 4a6ce6ef72bb872a9f0a94933b3d6f749b58538e | |
| parent | usb: Realloc xHCI structures after a hub is verified. (diff) | |
| download | linux-a6d940dd759bf240d28624198660ed34582a327b.tar.xz linux-a6d940dd759bf240d28624198660ed34582a327b.zip | |
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
| -rw-r--r-- | drivers/usb/host/xhci.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index b2c56d15fb42..34cf4e165877 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); |