ioat: fix self test for multi-channel case

In the multiple device case we need to re-arm the completion and protect
against concurrent self-tests.  The printk from the test callback is
removed as it can arbitrarily delay completion of the test.

Cc: <stable@kernel.org>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index e42e1ae..b3759c4 100644 (file)
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -1340,12 +1340,11 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
  */
 #define IOAT_TEST_SIZE 2000
 
-DECLARE_COMPLETION(test_completion);
 static void ioat_dma_test_callback(void *dma_async_param)
 {
-       printk(KERN_ERR "ioatdma: ioat_dma_test_callback(%p)\n",
-               dma_async_param);
-       complete(&test_completion);
+       struct completion *cmp = dma_async_param;
+
+       complete(cmp);
 }
 
 /**
@@ -1362,6 +1361,7 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
        dma_addr_t dma_dest, dma_src;
        dma_cookie_t cookie;
        int err = 0;
+       struct completion cmp;
 
        src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL);
        if (!src)
@@ -1401,8 +1401,9 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
        }
 
        async_tx_ack(tx);
+       init_completion(&cmp);
        tx->callback = ioat_dma_test_callback;
-       tx->callback_param = (void *)0x8086;
+       tx->callback_param = &cmp;
        cookie = tx->tx_submit(tx);
        if (cookie < 0) {
                dev_err(&device->pdev->dev,
@@ -1412,7 +1413,7 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
        }
        device->common.device_issue_pending(dma_chan);
 
-       wait_for_completion_timeout(&test_completion, msecs_to_jiffies(3000));
+       wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
 
        if (device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL)
                                        != DMA_SUCCESS) {