Adhere to Linux kernel coding style
Reported by checkpatch:
CHECK: mutex definition without comment
Proof for comment:
1. The mutex is used to protect access to the 'running' list
(line 1798 tsi148_dma_list_exec function)
mutex_lock(&ctrlrl->mtx);
if (!list_empty(&ctrlr->running)) {
mutex_unlock(&ctrlr->mtx);
return -EBUSY;
}
This prevents race conditions when multiple threads attempt to start DMA
operations simultaneously.
2. It's also used when removing DMA list from running list:
(line 1862 tsi148_dma_list_exec function)
mutex_lock(&ctrlr->mtx);
list_del(&list->list);
mutex_unlock(&ctrlr->mtx);
Ensuring thread-safe modification of the controller's state.
Without this mutex, concurrent access to the DMA controller's state could
lead to data corruption or inconsistant state.
Signed-off-by: Riyan Dhiman <riyandhiman14@xxxxxxxxx>
---
drivers/staging/vme_user/vme_bridge.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/staging/vme_user/vme_bridge.h b/drivers/staging/vme_user/vme_bridge.h
index 9bdc41bb6602..bb3750b40eb1 100644
--- a/drivers/staging/vme_user/vme_bridge.h
+++ b/drivers/staging/vme_user/vme_bridge.h
@@ -61,6 +61,7 @@ struct vme_dma_list {
struct vme_dma_resource {
struct list_head list;
struct vme_bridge *parent;
+ /* Mutex to protect DMA controller resources and ensure thread-safe operations */
struct mutex mtx;
int locked;
int number;
--
2.39.2
