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| author | Peter Ujfalusi <peter.ujfalusi@linux.intel.com> | 2022-06-10 11:01:19 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-06-10 15:31:47 +0300 |
| commit | 1e90de2c9a40d7d0af5c7b0a6e2d362ffba94772 (patch) | |
| tree | a8a2c3e40da66490cbe6a5f381a1fc03575de678 /sound/soc/sof/ipc3-dtrace.c | |
| parent | b66f9e703f0bee4e1aa7010299914b7b2009b4e0 (diff) | |
| download | linux-1e90de2c9a40d7d0af5c7b0a6e2d362ffba94772.tar.xz | |
ASoC: SOF: ipc3-dtrace: Return from dtrace_read if there is no new data available
If no new trace data is available then return immediately, there is no
need to continue with the execution of the trace_read() function.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220610080119.30880-4-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/sof/ipc3-dtrace.c')
| -rw-r--r-- | sound/soc/sof/ipc3-dtrace.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/soc/sof/ipc3-dtrace.c b/sound/soc/sof/ipc3-dtrace.c index 1f4d7a98c8fc..f59931d818c1 100644 --- a/sound/soc/sof/ipc3-dtrace.c +++ b/sound/soc/sof/ipc3-dtrace.c @@ -353,6 +353,10 @@ static ssize_t dfsentry_dtrace_read(struct file *file, char __user *buffer, return -EIO; } + /* no new trace data */ + if (!avail) + return 0; + /* make sure count is <= avail */ if (count > avail) count = avail; |