linux-kernel - [PATCH 2/4] slimbus: core: do not call device

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Date:   Mon, 14 Jan 2019 13:44:47 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        broonie@...nel.org, linux-arm-msm@...r.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Subject: [PATCH 2/4] slimbus: core: do not call device_status under a lock

Calling device_status callback under a lock would prevent drivers
to do any slimbus trasactions which would invoke this lock like
get_laddr(). Remove this unnecessary lock!

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/slimbus/core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/slimbus/core.c b/drivers/slimbus/core.c
index 9e4f3b21ba8c..1ba08b5f2e78 100644
--- a/drivers/slimbus/core.c
+++ b/drivers/slimbus/core.c
@@ -466,6 +466,7 @@ static int slim_device_alloc_laddr(struct slim_device *sbdev,
 
 	sbdev->laddr = laddr;
 	sbdev->is_laddr_valid = true;
+	mutex_unlock(&ctrl->lock);
 
 	slim_device_update_status(sbdev, SLIM_DEVICE_STATUS_UP);
 
@@ -473,6 +474,8 @@ static int slim_device_alloc_laddr(struct slim_device *sbdev,
 		laddr, sbdev->e_addr.manf_id, sbdev->e_addr.prod_code,
 		sbdev->e_addr.dev_index, sbdev->e_addr.instance);
 
+	return 0;
+
 err:
 	mutex_unlock(&ctrl->lock);
 	return ret;
-- 
2.20.1