list.h: Add list_splice_tail() and list_splice_tail_init()

If you are using linked lists for queues list_splice() will not do what
you would expect even if you use the elements passed reversed. We need
to handle these differently. We add list_splice_tail() and
list_splice_tail_init().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index a52156e56886..bc8c6e3470ca 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -551,7 +551,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
         /* write address into NextDescriptor field of last desc in chain */
         to_ioat_desc(ioat_chan->used_desc.prev)->hw->next =
                                                         first->async_tx.phys;
-        __list_splice(&new_chain, ioat_chan->used_desc.prev);
+        list_splice_tail(&new_chain, &ioat_chan->used_desc);
 
         ioat_chan->dmacount += desc_count;
         ioat_chan->pending += desc_count;
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 2622b6596d7c..3712b925b315 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -932,7 +932,7 @@ static struct ehci_qh *qh_append_tds (
 
                         list_del (&qtd->qtd_list);
                         list_add (&dummy->qtd_list, qtd_list);
-                        __list_splice (qtd_list, qh->qtd_list.prev);
+                        list_splice_tail(qtd_list, &qh->qtd_list);
 
                         ehci_qtd_init(ehci, qtd, qtd->qtd_dma);
                         qh->dummy = qtd;