Make the sys_error flag an atomic bitops in order to avoid
locking in sys_error readers.
Signed-off-by: Stanimir Varbanov <[email protected]>
---
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 8df2d497d706..a625a8477f75 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>
@@ -181,7 +182,7 @@ 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 1fe6d463dc99..210c628ac8f4 100644
--- a/drivers/media/platform/qcom/venus/helpers.c
+++ b/drivers/media/platform/qcom/venus/helpers.c
@@ -1477,7 +1477,7 @@ 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 198e47eb63f4..68736359fc2c 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
From: Stanimir Varbanov <[email protected]>
> Sent: 08 June 2021 12:42
>
> Make the sys_error flag an atomic bitops in order to avoid
> locking in sys_error readers.
I don't think that makes any difference at all.
It is only atomic w.r.t other bitops in the same bitmap.
Even if it contained the fullest memory barrier you can
imagine the result of test_bit() is immediately stale.
David
-
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