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  1. 23 4月, 2009 1 次提交
  3. 10 2月, 2009 2 次提交
  5. 30 1月, 2009 5 次提交
  7. 20 12月, 2008 1 次提交
    • Z
      iwlwifi: use GFP_KERNEL to allocate Rx SKB memory · f1bc4ac6
      由 Zhu Yi 提交于 
      Previously we allocate Rx SKB with GFP_ATOMIC flag. This is because we need
to hold a spinlock to protect the two rx_used and rx_free lists operation
in the rxq.

	spin_lock();
	...
	element = rxq->rx_used.next;
	element->skb = alloc_skb(..., GFP_ATOMIC);
	list_del(element);
	list_add_tail(&element->list, &rxq->rx_free);
	...
	spin_unlock();

After spliting the rx_used delete and rx_free insert into two operations,
we don't require the skb allocation in an atomic context any more (the
function itself is scheduled in a workqueue).

	spin_lock();
	...
	element = rxq->rx_used.next;
	list_del(element);
	...
	spin_unlock();
	...
	element->skb = alloc_skb(..., GFP_KERNEL);
	...
	spin_lock()
	...
	list_add_tail(&element->list, &rxq->rx_free);
	...
	spin_unlock();

This patch should fix the "iwlagn: Can not allocate SKB buffers" warning
we see recently.
Signed-off-by: NZhu Yi <yi.zhu@intel.com>
Acked-by: NTomas Winkler <tomas.winkler@intel.com>
Cc: stable@kernel.org
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      f1bc4ac6
  9. 13 12月, 2008 7 次提交
  11. 26 11月, 2008 1 次提交
  13. 22 11月, 2008 2 次提交
  15. 19 11月, 2008 1 次提交
    • J
      iwlagn: fix RX skb alignment · 4018517a
      由 Johannes Berg 提交于 
      So I dug deeper into the DMA problems I had with iwlagn and a kind soul
helped me in that he said something about pci-e alignment and mentioned
the iwl_rx_allocate function to check for crossing 4KB boundaries. Since
there's 8KB A-MPDU support, crossing 4k boundaries didn't seem like
something the device would fail with, but when I looked into the
function for a minute anyway I stumbled over this little gem:

	BUG_ON(rxb->dma_addr & (~DMA_BIT_MASK(36) & 0xff));

Clearly, that is a totally bogus check, one would hope the compiler
removes it entirely. (Think about it)

After fixing it, I obviously ran into it, nothing guarantees the
alignment the way you want it,  because of the way skbs and their
headroom are allocated. I won't explain that here nor double-check that
I'm right, that goes beyond what most of the CC'ed people care about.

So then I came up with the patch below, and so far my system has
survived minutes with 64K pages, when it would previously fail in
seconds. And I haven't seen a single instance of the TX bug either. But
when you see the patch it'll be pretty obvious to you why.

This should fix the following reported kernel bugs:

http://bugzilla.kernel.org/show_bug.cgi?id=11596
http://bugzilla.kernel.org/show_bug.cgi?id=11393
http://bugzilla.kernel.org/show_bug.cgi?id=11983

I haven't checked if there are any elsewhere, but I suppose RHBZ will
have a few instances too...

I'd like to ask anyone who is CC'ed (those are people I know ran into
the bug) to try this patch.

I am convinced that this patch is correct in spirit, but I haven't
understood why, for example, there are so many unmap calls. I'm not
entirely convinced that this is the only bug leading to the TX reply
errors.
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
      4018517a
  17. 01 11月, 2008 1 次提交
  19. 01 10月, 2008 1 次提交
  21. 16 9月, 2008 1 次提交
  23. 04 9月, 2008 1 次提交
  25. 23 8月, 2008 1 次提交
  27. 05 8月, 2008 1 次提交
  29. 15 7月, 2008 1 次提交
  31. 03 7月, 2008 1 次提交
  33. 01 7月, 2008 5 次提交
  35. 15 6月, 2008 1 次提交
  37. 04 6月, 2008 2 次提交
  39. 15 5月, 2008 3 次提交