[git:media_stage/master] media: venus: avoid multiple core dumps

[Hans Verkuil]

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Subject: media: venus: avoid multiple core dumps
Author:  Dikshita Agarwal <quic_diksh...@quicinc.com>
Date:    Wed Mar 6 11:23:26 2024 +0530

Core dump is generated whenever there is system error reported
by firmware. Right now, multiple such dumps are generated if
recovery fails in first attempt, since the sys error handler is
invoked again for every failed recovery.
To avoid it, add conditional check to generate core dump only
once during every system error notification from firmware.

Signed-off-by: Dikshita Agarwal <quic_diksh...@quicinc.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonog...@linaro.org>
Signed-off-by: Stanimir Varbanov <stanimir.k.varba...@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-ci...@xs4all.nl>
[hverkuil: document new dump_core field]

 drivers/media/platform/qcom/venus/core.c | 6 +++++-
 drivers/media/platform/qcom/venus/core.h | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

---

diff --git a/drivers/media/platform/qcom/venus/core.c 
b/drivers/media/platform/qcom/venus/core.c
index ce206b709754..af8890fd6ec2 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -68,6 +68,7 @@ static void venus_event_notify(struct venus_core *core, u32 
event)
 
        mutex_lock(&core->lock);
        set_bit(0, &core->sys_error);
+       set_bit(0, &core->dump_core);
        list_for_each_entry(inst, &core->instances, list)
                inst->ops->event_notify(inst, EVT_SESSION_ERROR, NULL);
        mutex_unlock(&core->lock);
@@ -110,7 +111,10 @@ static void venus_sys_error_handler(struct work_struct 
*work)
 
        venus_shutdown(core);
 
-       venus_coredump(core);
+       if (test_bit(0, &core->dump_core)) {
+               venus_coredump(core);
+               clear_bit(0, &core->dump_core);
+       }
 
        pm_runtime_put_sync(core->dev);
 
diff --git a/drivers/media/platform/qcom/venus/core.h 
b/drivers/media/platform/qcom/venus/core.h
index 6a77de374454..55202b89e1b9 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -169,6 +169,7 @@ struct venus_format {
  * @core1_usage_count: usage counter for core1
  * @root:      debugfs root directory
  * @venus_ver: the venus firmware version
+ * @dump_core: a flag indicating that a core dump is required
  */
 struct venus_core {
        void __iomem *base;
@@ -232,6 +233,7 @@ struct venus_core {
                u32 minor;
                u32 rev;
        } venus_ver;
+       unsigned long dump_core;
 };
 
 struct vdec_controls {