dmaengine: PL08x: use vchan's spinlock

Initialize the vchan struct, and use the provided spinlock rather than
our own.

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 21 insertions, 25 deletions

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index eb2b60e8e1cb..be0dc3b7c409 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -53,6 +53,7 @@ config AMBA_PL08X
         bool "ARM PrimeCell PL080 or PL081 support"
         depends on ARM_AMBA && EXPERIMENTAL
         select DMA_ENGINE
+        select DMA_VIRTUAL_CHANNELS
         help
           Platform has a PL08x DMAC device
           which can provide DMA engine support
diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 9a0642805b82..398a5da6f439 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -237,7 +237,6 @@ struct pl08x_dma_chan {
         struct list_head issued_list;
         struct list_head done_list;
         struct pl08x_txd *at;
-        spinlock_t lock;
         struct pl08x_driver_data *host;
         enum pl08x_dma_chan_state state;
         bool slave;
@@ -484,7 +483,7 @@ static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
         unsigned long flags;
         size_t bytes = 0;
 
-        spin_lock_irqsave(&plchan->lock, flags);
+        spin_lock_irqsave(&plchan->vc.lock, flags);
         ch = plchan->phychan;
         txd = plchan->at;
 
@@ -543,7 +542,7 @@ static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
                 }
         }
 
-        spin_unlock_irqrestore(&plchan->lock, flags);
+        spin_unlock_irqrestore(&plchan->vc.lock, flags);
 
         return bytes;
 }
@@ -673,12 +672,12 @@ static void pl08x_phy_free(struct pl08x_dma_chan *plchan)
                  * Eww.  We know this isn't going to deadlock
                  * but lockdep probably doesn't.
                  */
-                spin_lock(&next->lock);
+                spin_lock(&next->vc.lock);
                 /* Re-check the state now that we have the lock */
                 success = next->state == PL08X_CHAN_WAITING;
                 if (success)
                         pl08x_phy_reassign_start(plchan->phychan, next);
-                spin_unlock(&next->lock);
+                spin_unlock(&next->vc.lock);
 
                 /* If the state changed, try to find another channel */
                 if (!success)
@@ -1125,12 +1124,12 @@ static dma_cookie_t pl08x_tx_submit(struct dma_async_tx_descriptor *tx)
         unsigned long flags;
         dma_cookie_t cookie;
 
-        spin_lock_irqsave(&plchan->lock, flags);
+        spin_lock_irqsave(&plchan->vc.lock, flags);
         cookie = dma_cookie_assign(tx);
 
         /* Put this onto the pending list */
         list_add_tail(&txd->node, &plchan->pend_list);
-        spin_unlock_irqrestore(&plchan->lock, flags);
+        spin_unlock_irqrestore(&plchan->vc.lock, flags);
 
         return cookie;
 }
@@ -1318,13 +1317,13 @@ static void pl08x_issue_pending(struct dma_chan *chan)
         struct pl08x_dma_chan *plchan = to_pl08x_chan(chan);
         unsigned long flags;
 
-        spin_lock_irqsave(&plchan->lock, flags);
+        spin_lock_irqsave(&plchan->vc.lock, flags);
         list_splice_tail_init(&plchan->pend_list, &plchan->issued_list);
         if (!list_empty(&plchan->issued_list)) {
                 if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING)
                         pl08x_phy_alloc_and_start(plchan);
         }
-        spin_unlock_irqrestore(&plchan->lock, flags);
+        spin_unlock_irqrestore(&plchan->vc.lock, flags);
 }
 
 static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
@@ -1337,9 +1336,9 @@ static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
         if (!num_llis) {
                 unsigned long flags;
 
-                spin_lock_irqsave(&plchan->lock, flags);
+                spin_lock_irqsave(&plchan->vc.lock, flags);
                 pl08x_free_txd(pl08x, txd);
-                spin_unlock_irqrestore(&plchan->lock, flags);
+                spin_unlock_irqrestore(&plchan->vc.lock, flags);
 
                 return -EINVAL;
         }
@@ -1551,9 +1550,9 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
          * Anything succeeds on channels with no physical allocation and
          * no queued transfers.
          */
-        spin_lock_irqsave(&plchan->lock, flags);
+        spin_lock_irqsave(&plchan->vc.lock, flags);
         if (!plchan->phychan && !plchan->at) {
-                spin_unlock_irqrestore(&plchan->lock, flags);
+                spin_unlock_irqrestore(&plchan->vc.lock, flags);
                 return 0;
         }
 
@@ -1592,7 +1591,7 @@ static int pl08x_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
                 break;
         }
 
-        spin_unlock_irqrestore(&plchan->lock, flags);
+        spin_unlock_irqrestore(&plchan->vc.lock, flags);
 
         return ret;
 }
@@ -1664,9 +1663,9 @@ static void pl08x_tasklet(unsigned long data)
         unsigned long flags;
         LIST_HEAD(head);
 
-        spin_lock_irqsave(&plchan->lock, flags);
+        spin_lock_irqsave(&plchan->vc.lock, flags);
         list_splice_tail_init(&plchan->done_list, &head);
-        spin_unlock_irqrestore(&plchan->lock, flags);
+        spin_unlock_irqrestore(&plchan->vc.lock, flags);
 
         while (!list_empty(&head)) {
                 struct pl08x_txd *txd = list_first_entry(&head,
@@ -1681,9 +1680,9 @@ static void pl08x_tasklet(unsigned long data)
                         pl08x_unmap_buffers(txd);
 
                 /* Free the descriptor */
-                spin_lock_irqsave(&plchan->lock, flags);
+                spin_lock_irqsave(&plchan->vc.lock, flags);
                 pl08x_free_txd(pl08x, txd);
-                spin_unlock_irqrestore(&plchan->lock, flags);
+                spin_unlock_irqrestore(&plchan->vc.lock, flags);
 
                 /* Callback to signal completion */
                 if (callback)
@@ -1724,7 +1723,7 @@ static irqreturn_t pl08x_irq(int irq, void *dev)
                                 continue;
                         }
 
-                        spin_lock(&plchan->lock);
+                        spin_lock(&plchan->vc.lock);
                         tx = plchan->at;
                         if (tx) {
                                 plchan->at = NULL;
@@ -1745,7 +1744,7 @@ static irqreturn_t pl08x_irq(int irq, void *dev)
                                 else
                                         pl08x_phy_free(plchan);
                         }
-                        spin_unlock(&plchan->lock);
+                        spin_unlock(&plchan->vc.lock);
 
                         /* Schedule tasklet on this channel */
                         tasklet_schedule(&plchan->tasklet);
@@ -1808,17 +1807,13 @@ static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x,
                          "initialize virtual channel \"%s\"\n",
                          chan->name);
 
-                chan->vc.chan.device = dmadev;
-                dma_cookie_init(&chan->vc.chan);
-
-                spin_lock_init(&chan->lock);
                 INIT_LIST_HEAD(&chan->pend_list);
                 INIT_LIST_HEAD(&chan->issued_list);
                 INIT_LIST_HEAD(&chan->done_list);
                 tasklet_init(&chan->tasklet, pl08x_tasklet,
                              (unsigned long) chan);
 
-                list_add_tail(&chan->vc.chan.device_node, &dmadev->channels);
+                vchan_init(&chan->vc, dmadev);
         }
         dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n",
                  i, slave ? "slave" : "memcpy");