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Commit ca2f8ec1 authored by Tingwei Zhang's avatar Tingwei Zhang
Browse files

coresight: stop writing to USB when USB not available 



Stop sending data to USB when getting USB disconnect event.

Change-Id: I7a41f8afc49f451c2d22c665fb927269e6f5bd9f
Signed-off-by: default avatarTingwei Zhang <tingwei@codeaurora.org>
parent 99a8045e

drivers/hwtracing/coresight/coresight-byte-cntr.c

+11 −4
Original line number Diff line number Diff line
@@ -198,6 +198,7 @@ int usb_bypass_start(struct byte_cntr *byte_cntr_data) 


	atomic_set(&byte_cntr_data->usb_free_buf, USB_BUF_NUM);

	byte_cntr_data->offset = tmcdrvdata->etr_buf->offset;

	byte_cntr_data->read_active = true;

	/*

	 * IRQ is a '8- byte' counter and to observe interrupt at

	 * 'block_size' bytes of data
@@ -216,7 +217,9 @@ void usb_bypass_stop(struct byte_cntr *byte_cntr_data) 
		return;



	mutex_lock(&byte_cntr_data->usb_bypass_lock);

	byte_cntr_data->read_active = false;

	wake_up(&byte_cntr_data->usb_wait_wq);

	pr_info("coresight: stop usb bypass\n");

	coresight_csr_set_byte_cntr(byte_cntr_data->csr, 0);

	mutex_unlock(&byte_cntr_data->usb_bypass_lock);
@@ -320,9 +323,11 @@ static void usb_read_work_fn(struct work_struct *work) 
			ret = wait_event_interruptible(drvdata->usb_wait_wq,

				atomic_read(&drvdata->irq_cnt) > 0

				|| !tmcdrvdata->enable || tmcdrvdata->out_mode

				!= TMC_ETR_OUT_MODE_USB);

				!= TMC_ETR_OUT_MODE_USB

				|| !drvdata->read_active);

			if (ret == -ERESTARTSYS || !tmcdrvdata->enable

			|| tmcdrvdata->out_mode != TMC_ETR_OUT_MODE_USB)

			|| tmcdrvdata->out_mode != TMC_ETR_OUT_MODE_USB

			|| !drvdata->read_active)

				break;

		}
@@ -356,8 +361,10 @@ static void usb_read_work_fn(struct work_struct *work) 
					usb_req = NULL;

					drvdata->usb_req = NULL;

					dev_err(tmcdrvdata->dev,

						"Write data failed\n");

						"Write data failed:%d\n", ret);

					if (ret == -EAGAIN)

						continue;

					return;

				}

				atomic_dec(&drvdata->usb_free_buf);