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Commit bedffda8 authored by Mathieu Poirier's avatar Mathieu Poirier Committed by Greg Kroah-Hartman
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coresight: etb10: adjust read pointer only when needed 



The read pointer (read_ptr) needs to be adjusted only if its value
has gone beyond the length of the memory buffer.

Reported-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent dc2c4ef1

drivers/hwtracing/coresight/coresight-etb10.c

+2 −1
Original line number Original line Diff line number Diff line
@@ -428,7 +428,8 @@ static void etb_update_buffer(struct coresight_device *csdev, 
		read_ptr = (write_ptr + drvdata->buffer_depth) -

		read_ptr = (write_ptr + drvdata->buffer_depth) -

					to_read / ETB_FRAME_SIZE_WORDS;

					to_read / ETB_FRAME_SIZE_WORDS;

		/* Wrap around if need be*/

		/* Wrap around if need be*/

		read_ptr &= ~(drvdata->buffer_depth - 1);

		if (read_ptr > (drvdata->buffer_depth - 1))

			read_ptr -= drvdata->buffer_depth;

		/* let the decoder know we've skipped ahead */

		/* let the decoder know we've skipped ahead */

		local_inc(&buf->lost);

		local_inc(&buf->lost);

	}

	}