dmaengine: IOATDMA: fix timer code that continues to restart channels during idle

The timer_event() function seems to have a bug where it ends up marking the
last entry as non-responding and eventually attempts to restart the
channel.  This also continuously happen when idle. What needs to happen is
for us to make sure there are no descriptors active and then handle that
case properly.  We should only hit the "cleanup" stage if there are still
active descriptors.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 1d5df2e..21539d5 100644 (file)
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -861,32 +861,42 @@ void ioat_timer_event(unsigned long data)
                        return;
        }
 
+       spin_lock_bh(&ioat_chan->cleanup_lock);
+
+       /* handle the no-actives case */
+       if (!ioat_ring_active(ioat_chan)) {
+               spin_lock_bh(&ioat_chan->prep_lock);
+               check_active(ioat_chan);
+               spin_unlock_bh(&ioat_chan->prep_lock);
+               spin_unlock_bh(&ioat_chan->cleanup_lock);
+               return;
+       }
+
        /* if we haven't made progress and we have already
         * acknowledged a pending completion once, then be more
         * forceful with a restart
         */
-       spin_lock_bh(&ioat_chan->cleanup_lock);
        if (ioat_cleanup_preamble(ioat_chan, &phys_complete))
                __cleanup(ioat_chan, phys_complete);
        else if (test_bit(IOAT_COMPLETION_ACK, &ioat_chan->state)) {
+               u32 chanerr;
+
+               chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
+               dev_warn(to_dev(ioat_chan), "Restarting channel...\n");
+               dev_warn(to_dev(ioat_chan), "CHANSTS: %#Lx CHANERR: %#x\n",
+                        status, chanerr);
+               dev_warn(to_dev(ioat_chan), "Active descriptors: %d\n",
+                        ioat_ring_active(ioat_chan));
+
                spin_lock_bh(&ioat_chan->prep_lock);
                ioat_restart_channel(ioat_chan);
                spin_unlock_bh(&ioat_chan->prep_lock);
                spin_unlock_bh(&ioat_chan->cleanup_lock);
                return;
-       } else {
+       } else
                set_bit(IOAT_COMPLETION_ACK, &ioat_chan->state);
-               mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
-       }
-
 
-       if (ioat_ring_active(ioat_chan))
-               mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
-       else {
-               spin_lock_bh(&ioat_chan->prep_lock);
-               check_active(ioat_chan);
-               spin_unlock_bh(&ioat_chan->prep_lock);
-       }
+       mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
        spin_unlock_bh(&ioat_chan->cleanup_lock);
 }