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path: root/sound/soc/sof/ipc4-mtrace.c
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Diffstat (limited to 'sound/soc/sof/ipc4-mtrace.c')
-rw-r--r--sound/soc/sof/ipc4-mtrace.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/sound/soc/sof/ipc4-mtrace.c b/sound/soc/sof/ipc4-mtrace.c
index 9c7080041d08..70dea8ae706e 100644
--- a/sound/soc/sof/ipc4-mtrace.c
+++ b/sound/soc/sof/ipc4-mtrace.c
@@ -108,6 +108,7 @@ struct sof_mtrace_core_data {
int id;
u32 slot_offset;
void *log_buffer;
+ struct mutex buffer_lock; /* for log_buffer alloc/free */
u32 host_read_ptr;
u32 dsp_write_ptr;
/* pos update IPC arrived before the slot offset is known, queried */
@@ -128,14 +129,22 @@ static int sof_ipc4_mtrace_dfs_open(struct inode *inode, struct file *file)
struct sof_mtrace_core_data *core_data = inode->i_private;
int ret;
+ mutex_lock(&core_data->buffer_lock);
+
+ if (core_data->log_buffer) {
+ ret = -EBUSY;
+ goto out;
+ }
+
ret = debugfs_file_get(file->f_path.dentry);
if (unlikely(ret))
- return ret;
+ goto out;
core_data->log_buffer = kmalloc(SOF_MTRACE_SLOT_SIZE, GFP_KERNEL);
if (!core_data->log_buffer) {
debugfs_file_put(file->f_path.dentry);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out;
}
ret = simple_open(inode, file);
@@ -144,6 +153,9 @@ static int sof_ipc4_mtrace_dfs_open(struct inode *inode, struct file *file)
debugfs_file_put(file->f_path.dentry);
}
+out:
+ mutex_unlock(&core_data->buffer_lock);
+
return ret;
}
@@ -280,7 +292,10 @@ static int sof_ipc4_mtrace_dfs_release(struct inode *inode, struct file *file)
debugfs_file_put(file->f_path.dentry);
+ mutex_lock(&core_data->buffer_lock);
kfree(core_data->log_buffer);
+ core_data->log_buffer = NULL;
+ mutex_unlock(&core_data->buffer_lock);
return 0;
}
@@ -563,6 +578,7 @@ static int ipc4_mtrace_init(struct snd_sof_dev *sdev)
struct sof_mtrace_core_data *core_data = &priv->cores[i];
init_waitqueue_head(&core_data->trace_sleep);
+ mutex_init(&core_data->buffer_lock);
core_data->sdev = sdev;
core_data->id = i;
}