I/OAT: fail self-test if callback test reaches timeout

If we miss interrupts in the self test then fail registration of this
channel as it is unsuitable for use as a public channel.

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

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 068b63514525..5905cd36bcd2 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -1363,6 +1363,7 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
         dma_cookie_t cookie;
         int err = 0;
         struct completion cmp;
+        unsigned long tmo;
 
         src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL);
         if (!src)
@@ -1414,9 +1415,10 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
         }
         device->common.device_issue_pending(dma_chan);
 
-        wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
+        tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
 
-        if (device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL)
+        if (tmo == 0 ||
+            device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL)
                                         != DMA_SUCCESS) {
                 dev_err(&device->pdev->dev,
                         "Self-test copy timed out, disabling\n");