Attachment 143006 Details for Bug 108577 – Diagnostic patches to determine which pointer is null

Diagnostic patches to determine which pointer is null

diags.patch (text/plain), 3.78 KB, created by Duncan Roe on 2019-01-08 04:07:41 UTC

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Creator: Duncan Roe

Created: 2019-01-08 04:07:41 UTC

Size: 3.78 KB

patch

obsolete

>diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
>index 59445c83f023..c0297201acb6 100644
>--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
>+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
>@@ -84,11 +84,13 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
> 	enum i2caux_transaction_action action;
> 	enum aux_transaction_type type;
> 
>+	DRM_DEBUG_KMS("msg=%p, aux=%p\n", msg, aux);
> 	if (WARN_ON(msg->size > 16))
> 		return -E2BIG;
> 
> 	switch (msg->request & ~DP_AUX_I2C_MOT) {
> 	case DP_AUX_NATIVE_READ:
>+		DRM_DEBUG_KMS("%s\n", "DP_AUX_NATIVE_READ");
> 		type = AUX_TRANSACTION_TYPE_DP;
> 		action = I2CAUX_TRANSACTION_ACTION_DP_READ;
> 
>@@ -101,6 +103,7 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
> 					      action);
> 		break;
> 	case DP_AUX_NATIVE_WRITE:
>+		DRM_DEBUG_KMS("%s\n", "DP_AUX_NATIVE_WRITE");
> 		type = AUX_TRANSACTION_TYPE_DP;
> 		action = I2CAUX_TRANSACTION_ACTION_DP_WRITE;
> 
>@@ -114,6 +117,7 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
> 		result = msg->size;
> 		break;
> 	case DP_AUX_I2C_READ:
>+		DRM_DEBUG_KMS("%s\n", "DP_AUX_I2C_READ");
> 		type = AUX_TRANSACTION_TYPE_I2C;
> 		if (msg->request & DP_AUX_I2C_MOT)
> 			action = I2CAUX_TRANSACTION_ACTION_I2C_READ_MOT;
>@@ -129,6 +133,7 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
> 					      action);
> 		break;
> 	case DP_AUX_I2C_WRITE:
>+		DRM_DEBUG_KMS("%s\n", "DP_AUX_I2C_WRITE");
> 		type = AUX_TRANSACTION_TYPE_I2C;
> 		if (msg->request & DP_AUX_I2C_MOT)
> 			action = I2CAUX_TRANSACTION_ACTION_I2C_WRITE_MOT;
>@@ -142,9 +147,11 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux,
> 				     msg->size,
> 				     type,
> 				     action);
>+		DRM_DEBUG_KMS("%s\n", "BACK FROM DP_AUX_I2C_WRITE");
> 		result = msg->size;
> 		break;
> 	default:
>+		DRM_DEBUG_KMS("%s\n", "-EINVAL");
> 		return -EINVAL;
> 	}
> 
>diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
>index 8def0d9fa0ff..f241f8c554e2 100644
>--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
>+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
>@@ -647,10 +647,26 @@ int dc_link_aux_transfer(struct ddc_service *ddc,
> 	int res = -1;
> 	uint32_t status;
> 
>+	DRM_DEBUG_KMS("%s: ddc=%p, reply=%p, buffer=%p\n",
>+		"DC_LINK_AUX_TRANSFER", ddc, reply, buffer);
>+	DRM_DEBUG_KMS("ddc->ddc_pin=%p\n", ddc->ddc_pin);
>+	DRM_DEBUG_KMS("ddc->ddc_pin->pin_data=%p\n", ddc->ddc_pin->pin_data);
>+	DRM_DEBUG_KMS("ddc->ddc_pin->pin_data->en=%d\n", ddc->ddc_pin->pin_data->en);
> 	memset(&aux_req, 0, sizeof(aux_req));
> 	memset(&aux_rep, 0, sizeof(aux_rep));
> 
>+	DRM_DEBUG_KMS("ddc->ctx=%p", ddc->ctx);
>+	DRM_DEBUG_KMS("ddc->ctx->dc=%p", ddc->ctx->dc);
>+	DRM_DEBUG_KMS("ddc->ctx->dc->res_pool=%p", ddc->ctx->dc->res_pool);
>+	DRM_DEBUG_KMS("ddc->ctx->dc->res_pool->engines=%p", ddc->ctx->dc->res_pool->engines);
>+	DRM_DEBUG_KMS("ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en]=%p",
>+		ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en]);
> 	aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
>+	DRM_DEBUG_KMS("aux_engine=%p\n", aux_engine);
>+	if (!aux_engine) {
>+		DRM_DEBUG_KMS("%s\n", "Cowardly refusing to call through null pointer");
>+		return -1;
>+	}
> 	aux_engine->funcs->acquire(aux_engine, ddc_pin);
> 
> 	aux_req.type = type;
>@@ -668,10 +684,13 @@ int dc_link_aux_transfer(struct ddc_service *ddc,
> 	case AUX_CHANNEL_OPERATION_SUCCEEDED:
> 		res = returned_bytes;
> 
>-		if (res <= size && res >= 0)
>+		if (res <= size && res >= 0) {
>+			if (!buffer)
>+				DRM_DEBUG_KMS("%s\n", "calling READ_CHANNEL_REPLY w/null buffer");
> 			res = aux_engine->funcs->read_channel_reply(aux_engine, size,
> 								buffer, reply,
> 								&status);
>+		}
> 
> 		break;
> 	case AUX_CHANNEL_OPERATION_FAILED_HPD_DISCON:

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Attachments on bug 108577: 142239 | 142250 | 142286 | 142292 | 142293 | 142334 | 142347 | 142348 | 142350 | 142351 | 142374 | 142382 | 142384 | 142396 | 143006

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