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Subject[PATCH] stm class: Fix channel free in stm output free path
From: Tingwei Zhang <>

Number of free masters is not set correctly in stm
free path. Fix this by properly adding the number
of output channels before setting them to 0 in

Currently it is equivalent to doing nothing since
master->nr_free is incremented by 0.

Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
Signed-off-by: Tingwei Zhang <>
Signed-off-by: Sai Prakash Ranjan <>
drivers/hwtracing/stm/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index c7ba8acfd4d5..5b5807cbcf7c 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -218,8 +218,8 @@ stm_output_disclaim(struct stm_device *stm, struct stm_output *output)
bitmap_release_region(&master->chan_map[0], output->channel,

- output->nr_chans = 0;
master->nr_free += output->nr_chans;
+ output->nr_chans = 0;

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