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>

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 068b635..5905cd3 100644 (file)
--- 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");