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authorMathieu Poirier <mathieu.poirier@linaro.org>2016-05-03 20:33:41 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-05-04 00:59:30 +0300
commitb5af0a26da84b75376706a92c7a58036a0bf3541 (patch)
tree523a0b589980c66d2159c6ea567de1e02e1a5877 /drivers/hwtracing
parent237483aa5cf43105d148d3f03b29eed47c3e6cf9 (diff)
downloadlinux-b5af0a26da84b75376706a92c7a58036a0bf3541.tar.xz
coresight: etb10: fixing the right amount of words to read
This patch rectifies the amount of words to read when the internal buffer is deemed bigger than the amount of space available in the perf ring buffer. The amount to read is set to the amount of space in the perf ring buffer rather than being subtracted by it. 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>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-etb10.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
index 2461d5c8c157..b0d402dbfeae 100644
--- a/drivers/hwtracing/coresight/coresight-etb10.c
+++ b/drivers/hwtracing/coresight/coresight-etb10.c
@@ -440,7 +440,7 @@ static void etb_update_buffer(struct coresight_device *csdev,
u32 mask = ~(ETB_FRAME_SIZE_WORDS - 1);
/* The new read pointer must be frame size aligned */
- to_read -= handle->size & mask;
+ to_read = handle->size & mask;
/*
* Move the RAM read pointer up, keeping in mind that
* everything is in frame size units.