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authorSarah Sharp2011-08-02 15:43:40 -0700
committerSarah Sharp2011-08-09 14:49:25 -0700
commit585df1d90cb07a02ca6c7a7d339e56e46d50dafb (patch)
tree62c5f003587d22dd28e4ba27332314765a285975 /Documentation/blockdev
parent522989a27c7badb608155b1f1dea3487ed431f74 (diff)
xhci: Remove TDs from TD lists when URBs are canceled.
When a driver tries to cancel an URB, and the host controller is dying, xhci_urb_dequeue will giveback the URB without removing the xhci_tds that comprise that URB from the td_list or the cancelled_td_list. This can cause a race condition between the driver calling URB dequeue and the stop endpoint command watchdog timer. If the timer fires on a dying host, and a driver attempts to resubmit while the watchdog timer has dropped the xhci->lock to giveback a cancelled URB, URBs may be given back by the xhci_urb_dequeue() function. At that point, the URB's priv pointer will be freed and set to NULL, but the TDs will remain on the td_list. This will cause an oops in xhci_giveback_urb_in_irq() when the watchdog timer attempts to loop through the endpoints' td_lists, giving back killed URBs. Make sure that xhci_urb_dequeue() removes TDs from the TD lists and canceled TD lists before it gives back the URB. This patch should be backported to kernels as old as 2.6.36. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: Andiry Xu <andiry.xu@amd.com> Cc: stable@kernel.org
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