tests: userspace: add null checks for dma and dai devices

Add zassert_not_null checks to userspace tests for Intel HDA DMA and SSP
DAI. This verifies that the retrieved DMA and DAI device pointers are valid
and not null before attempting to use them in the test cases.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

zephyr/test/userspace/test_intel_hda_dma.c

@@ -57,6 +57,7 @@ static void intel_hda_dma_user(void *p1, void *p2, void *p3)
 	 * cannot access
 	 */
 	dma = sof_dma_get(SOF_DMA_DIR_LMEM_TO_HMEM, 0, SOF_DMA_DEV_HOST, SOF_DMA_ACCESS_SHARED);
+	zassert_not_null(dma, "dma get failed");
 
 	k_sem_take(&ipc_sem_wake_user, K_FOREVER);
 	LOG_INF("configure DMA channel");
@@ -181,6 +182,7 @@ static void intel_hda_dma_kernel(void)
 	k_thread_access_grant(&user_thread, &ipc_sem_wake_kernel);
 
 	dma = DEVICE_DT_GET(DT_NODELABEL(hda_host_in));
+	zassert_not_null(dma, "hda_host_in device not found");
 	k_thread_access_grant(&user_thread, dma);
 
 	hda_ipc_msg(INTEL_ADSP_IPC_HOST_DEV, IPCCMD_HDA_RESET,

zephyr/test/userspace/test_intel_ssp_dai.c

@@ -130,13 +130,16 @@ static void intel_ssp_dai_user(void *p1, void *p2, void *p3)
 	 * cannot access
 	 */
 	dma_in = sof_dma_get(SOF_DMA_DIR_DEV_TO_MEM, 0, SOF_DMA_DEV_SSP, SOF_DMA_ACCESS_SHARED);
+	zassert_not_null(dma_in, "dma_in get failed");
 	dma_out = sof_dma_get(SOF_DMA_DIR_MEM_TO_DEV, 0, SOF_DMA_DEV_SSP, SOF_DMA_ACCESS_SHARED);
+	zassert_not_null(dma_out, "dma_out get failed");
 
 	k_sem_take(&ipc_sem_wake_user, K_FOREVER);
 
 	LOG_INF("create a DAI device for %s", STRINGIFY(SSP_DEVICE));
 
 	dai_dev = DEVICE_DT_GET(DT_NODELABEL(SSP_DEVICE));
+	zassert_not_null(dai_dev, "dai_dev DT struct not found");
 	err = dai_probe(dai_dev);
 	zassert_equal(err, 0);
 
@@ -297,8 +300,11 @@ static void intel_ssp_dai_kernel(void)
 	k_thread_access_grant(&user_thread, &ipc_sem_wake_kernel);
 
 	dma_out = DEVICE_DT_GET(DT_NODELABEL(hda_link_out));
+	zassert_not_null(dma_out, "hda_link_out not found");
 	dma_in = DEVICE_DT_GET(DT_NODELABEL(hda_link_in));
+	zassert_not_null(dma_in, "hda_link_in not found");
 	dai_dev = DEVICE_DT_GET(DT_NODELABEL(SSP_DEVICE));
+	zassert_not_null(dai_dev, "SSP_DEVICE not found");
 
 	k_thread_access_grant(&user_thread, dma_out);
 	k_thread_access_grant(&user_thread, dma_in);