Merge tag 'v3.10.86' into linux-linaro-lsk-v3.10lsk-v3.10-15.08

This is the 3.10.86 stable release

* tag 'v3.10.86': (132 commits)
  Linux 3.10.86
  efi: fix 32bit kernel boot failed problem using efi
  iscsi-target: Fix iser explicit logout TX kthread leak
  iscsi-target: Fix use-after-free during TPG session shutdown
  vhost: actually track log eventfd file
  rds: rds_ib_device.refcount overflow
  xhci: prevent bus_suspend if SS port resuming in phase 1
  xhci: report U3 when link is in resume state
  xhci: Calculate old endpoints correctly on device reset
  usb-storage: ignore ZTE MF 823 card reader in mode 0x1225
  ata: pmp: add quirk for Marvell 4140 SATA PMP
  blkcg: fix gendisk reference leak in blkg_conf_prep()
  Input: usbtouchscreen - avoid unresponsive TSC-30 touch screen
  tile: use free_bootmem_late() for initrd
  md/raid1: fix test for 'was read error from last working device'.
  mmc: sdhci-pxav3: fix platform_data is not initialized
  mmc: sdhci-esdhc: Make 8BIT bus work
  mac80211: clear subdir_stations when removing debugfs
  st: null pointer dereference panic caused by use after kref_put by st_open
  ALSA: hda - Fix MacBook Pro 5,2 quirk
  ...

1 files changed, 46 insertions, 26 deletions

diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index d64ae14f2706..43092c317897 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -393,7 +393,8 @@ static void __mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 	dma_cookie_t cookie = 0;
 	int busy = mv_chan_is_busy(mv_chan);
 	u32 current_desc = mv_chan_get_current_desc(mv_chan);
-	int seen_current = 0;
+	int current_cleaned = 0;
+	struct mv_xor_desc *hw_desc;
 
 	dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__);
 	dev_dbg(mv_chan_to_devp(mv_chan), "current_desc %x\n", current_desc);
@@ -405,38 +406,57 @@ static void __mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan)
 
 	list_for_each_entry_safe(iter, _iter, &mv_chan->chain,
 					chain_node) {
-		prefetch(_iter);
-		prefetch(&_iter->async_tx);
 
-		/* do not advance past the current descriptor loaded into the
-		 * hardware channel, subsequent descriptors are either in
-		 * process or have not been submitted
-		 */
-		if (seen_current)
-			break;
+		/* clean finished descriptors */
+		hw_desc = iter->hw_desc;
+		if (hw_desc->status & XOR_DESC_SUCCESS) {
+			cookie = mv_xor_run_tx_complete_actions(iter, mv_chan,
+								cookie);
 
-		/* stop the search if we reach the current descriptor and the
-		 * channel is busy
-		 */
-		if (iter->async_tx.phys == current_desc) {
-			seen_current = 1;
-			if (busy)
+			/* done processing desc, clean slot */
+			mv_xor_clean_slot(iter, mv_chan);
+
+			/* break if we did cleaned the current */
+			if (iter->async_tx.phys == current_desc) {
+				current_cleaned = 1;
+				break;
+			}
+		} else {
+			if (iter->async_tx.phys == current_desc) {
+				current_cleaned = 0;
 				break;
+			}
 		}
-
-		cookie = mv_xor_run_tx_complete_actions(iter, mv_chan, cookie);
-
-		if (mv_xor_clean_slot(iter, mv_chan))
-			break;
 	}
 
 	if ((busy == 0) && !list_empty(&mv_chan->chain)) {
-		struct mv_xor_desc_slot *chain_head;
-		chain_head = list_entry(mv_chan->chain.next,
-					struct mv_xor_desc_slot,
-					chain_node);
-
-		mv_xor_start_new_chain(mv_chan, chain_head);
+		if (current_cleaned) {
+			/*
+			 * current descriptor cleaned and removed, run
+			 * from list head
+			 */
+			iter = list_entry(mv_chan->chain.next,
+					  struct mv_xor_desc_slot,
+					  chain_node);
+			mv_xor_start_new_chain(mv_chan, iter);
+		} else {
+			if (!list_is_last(&iter->chain_node, &mv_chan->chain)) {
+				/*
+				 * descriptors are still waiting after
+				 * current, trigger them
+				 */
+				iter = list_entry(iter->chain_node.next,
+						  struct mv_xor_desc_slot,
+						  chain_node);
+				mv_xor_start_new_chain(mv_chan, iter);
+			} else {
+				/*
+				 * some descriptors are still waiting
+				 * to be cleaned
+				 */
+				tasklet_schedule(&mv_chan->irq_tasklet);
+			}
+		}
 	}
 
 	if (cookie > 0)