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From:   Stanimir Varbanov <stanimir.varbanov@linaro.org>
To:     linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Vikash Garodia <vgarodia@codeaurora.org>,
        Mansur Alisha Shaik <mansur@codeaurora.org>,
        Stanimir Varbanov <stanimir.varbanov@linaro.org>
Subject: [PATCH 2/5] venus: Make sys_error flag an atomic bitops
Date:   Tue, 18 May 2021 18:45:06 +0300
Message-Id: <20210518154509.602137-3-stanimir.varbanov@linaro.org>
In-Reply-To: <20210518154509.602137-1-stanimir.varbanov@linaro.org>
References: <20210518154509.602137-1-stanimir.varbanov@linaro.org>
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Make the sys_error flag an atomic bitops in order to avoid
locking in sys_error readers.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
---
 drivers/media/platform/qcom/venus/core.c    | 4 ++--
 drivers/media/platform/qcom/venus/core.h    | 3 ++-
 drivers/media/platform/qcom/venus/helpers.c | 2 +-
 drivers/media/platform/qcom/venus/hfi.c     | 2 +-
 drivers/media/platform/qcom/venus/vdec.c    | 2 +-
 5 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 91b15842c555..cc6195f2409c 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -65,7 +65,7 @@ static void venus_event_notify(struct venus_core *core, u32 event)
 	}
 
 	mutex_lock(&core->lock);
-	core->sys_error = true;
+	set_bit(0, &core->sys_error);
 	list_for_each_entry(inst, &core->instances, list)
 		inst->ops->event_notify(inst, EVT_SESSION_ERROR, NULL);
 	mutex_unlock(&core->lock);
@@ -161,7 +161,7 @@ static void venus_sys_error_handler(struct work_struct *work)
 	dev_warn(core->dev, "system error has occurred (recovered)\n");
 
 	mutex_lock(&core->lock);
-	core->sys_error = false;
+	clear_bit(0, &core->sys_error);
 	mutex_unlock(&core->lock);
 }
 
diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index 745f226a523f..15713209cc48 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -7,6 +7,7 @@
 #ifndef __VENUS_CORE_H_
 #define __VENUS_CORE_H_
 
+#include <linux/bitops.h>
 #include <linux/list.h>
 #include <media/videobuf2-v4l2.h>
 #include <media/v4l2-ctrls.h>
@@ -182,7 +183,7 @@ struct venus_core {
 	unsigned int state;
 	struct completion done;
 	unsigned int error;
-	bool sys_error;
+	unsigned long sys_error;
 	const struct hfi_core_ops *core_ops;
 	const struct venus_pm_ops *pm_ops;
 	struct mutex pm_lock;
diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
index b813d6dba481..de87f4c81a1c 100644
--- a/drivers/media/platform/qcom/venus/helpers.c
+++ b/drivers/media/platform/qcom/venus/helpers.c
@@ -1478,7 +1478,7 @@ void venus_helper_vb2_stop_streaming(struct vb2_queue *q)
 		ret |= venus_helper_intbufs_free(inst);
 		ret |= hfi_session_deinit(inst);
 
-		if (inst->session_error || core->sys_error)
+		if (inst->session_error || test_bit(0, &core->sys_error))
 			ret = -EIO;
 
 		if (ret)
diff --git a/drivers/media/platform/qcom/venus/hfi.c b/drivers/media/platform/qcom/venus/hfi.c
index 0f2482367e06..179b1f8b2650 100644
--- a/drivers/media/platform/qcom/venus/hfi.c
+++ b/drivers/media/platform/qcom/venus/hfi.c
@@ -214,7 +214,7 @@ int hfi_session_init(struct venus_inst *inst, u32 pixfmt)
 	 * session_init() can't pass successfully
 	 */
 	mutex_lock(&core->lock);
-	if (!core->ops || core->sys_error) {
+	if (!core->ops || test_bit(0, &inst->core->sys_error)) {
 		mutex_unlock(&core->lock);
 		return -EIO;
 	}
diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
index ddb7cd39424e..132a2921902a 100644
--- a/drivers/media/platform/qcom/venus/vdec.c
+++ b/drivers/media/platform/qcom/venus/vdec.c
@@ -1211,7 +1211,7 @@ static void vdec_session_release(struct venus_inst *inst)
 	ret = hfi_session_deinit(inst);
 	abort = (ret && ret != -EINVAL) ? 1 : 0;
 
-	if (inst->session_error || core->sys_error)
+	if (inst->session_error || test_bit(0, &core->sys_error))
 		abort = 1;
 
 	if (abort)
-- 
2.25.1