linux-kernel - [PATCH] stm: the number of masters should be (sw_end

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Date:	Fri, 11 Dec 2015 11:26:50 +0800
From:	Chunyan Zhang <zhang.chunyan@...aro.org>
To:	alexander.shishkin@...ux.intel.com
Cc:	linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org
Subject: [PATCH] stm: the number of masters should be (sw_end - sw_start + 1)

sw_end represents the last software master, sw_start is index of the
first master, so the number of software masters should be
sw_end - sw_start + 1.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
---
 drivers/hwtracing/intel_th/sth.c | 2 +-
 drivers/hwtracing/stm/core.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/intel_th/sth.c b/drivers/hwtracing/intel_th/sth.c
index 56101c3..28917d7 100644
--- a/drivers/hwtracing/intel_th/sth.c
+++ b/drivers/hwtracing/intel_th/sth.c
@@ -173,7 +173,7 @@ static int intel_th_sw_init(struct sth_device *sth)
 	sth->stm.sw_start = reg & 0xffff;
 	sth->stm.sw_end = reg >> 16;
 
-	sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start;
+	sth->sw_nmasters = sth->stm.sw_end - sth->stm.sw_start + 1;
 	dev_dbg(sth->dev, "sw_start: %x sw_end: %x masters: %x nchannels: %x\n",
 		sth->stm.sw_start, sth->stm.sw_end, sth->sw_nmasters,
 		sth->stm.sw_nchannels);
diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 7f7bdb3..cb676f2 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -632,7 +632,7 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
 	if (!stm_data->packet || !stm_data->sw_nchannels)
 		return -EINVAL;
 
-	nmasters = stm_data->sw_end - stm_data->sw_start;
+	nmasters = stm_data->sw_end - stm_data->sw_start + 1;
 	stm = kzalloc(sizeof(*stm) + nmasters * sizeof(void *), GFP_KERNEL);
 	if (!stm)
 		return -ENOMEM;
-- 
1.9.1

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