struct smb_drv_data, miscdev);
int ret = 0;
- mutex_lock(&drvdata->mutex);
+ spin_lock(&drvdata->spinlock);
if (drvdata->reading) {
ret = -EBUSY;
drvdata->reading = true;
out:
- mutex_unlock(&drvdata->mutex);
+ spin_unlock(&drvdata->spinlock);
return ret;
}
if (!len)
return 0;
- mutex_lock(&drvdata->mutex);
-
if (!sdb->data_size)
- goto out;
+ return 0;
to_copy = min(sdb->data_size, len);
if (copy_to_user(data, sdb->buf_base + sdb->buf_rdptr, to_copy)) {
dev_dbg(dev, "Failed to copy data to user\n");
- to_copy = -EFAULT;
- goto out;
+ return -EFAULT;
}
*ppos += to_copy;
-
smb_update_read_ptr(drvdata, to_copy);
-
- dev_dbg(dev, "%zu bytes copied\n", to_copy);
-out:
if (!sdb->data_size)
smb_reset_buffer(drvdata);
- mutex_unlock(&drvdata->mutex);
+ dev_dbg(dev, "%zu bytes copied\n", to_copy);
return to_copy;
}
struct smb_drv_data *drvdata = container_of(file->private_data,
struct smb_drv_data, miscdev);
- mutex_lock(&drvdata->mutex);
+ spin_lock(&drvdata->spinlock);
drvdata->reading = false;
- mutex_unlock(&drvdata->mutex);
+ spin_unlock(&drvdata->spinlock);
return 0;
}
struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
int ret = 0;
- mutex_lock(&drvdata->mutex);
+ spin_lock(&drvdata->spinlock);
/* Do nothing, the trace data is reading by other interface now */
if (drvdata->reading) {
dev_dbg(&csdev->dev, "Ultrasoc SMB enabled\n");
out:
- mutex_unlock(&drvdata->mutex);
+ spin_unlock(&drvdata->spinlock);
return ret;
}
struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
int ret = 0;
- mutex_lock(&drvdata->mutex);
+ spin_lock(&drvdata->spinlock);
if (drvdata->reading) {
ret = -EBUSY;
dev_dbg(&csdev->dev, "Ultrasoc SMB disabled\n");
out:
- mutex_unlock(&drvdata->mutex);
+ spin_unlock(&drvdata->spinlock);
return ret;
}
if (!buf)
return 0;
- mutex_lock(&drvdata->mutex);
+ spin_lock(&drvdata->spinlock);
/* Don't do anything if another tracer is using this sink. */
if (atomic_read(&csdev->refcnt) != 1)
if (!buf->snapshot && lost)
perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
out:
- mutex_unlock(&drvdata->mutex);
+ spin_unlock(&drvdata->spinlock);
return data_size;
}
return ret;
}
- mutex_init(&drvdata->mutex);
+ spin_lock_init(&drvdata->spinlock);
drvdata->pid = -1;
ret = smb_register_sink(pdev, drvdata);