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coresight: etb10: adjust read pointer only when needed

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

Reported-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2016-05-03 11:34:01 -06:00 committed by Greg Kroah-Hartman
parent dc2c4ef141
commit bedffda8ca
1 changed files with 2 additions and 1 deletions
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3
drivers/hwtracing/coresight/coresight-etb10.c
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@ -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);
} }