[PATCH 2/3] staging: r8188eu: Use completions for signaling enqueueing

From: Fabio M. De Francesco
Date: Sat Oct 16 2021 - 05:11:28 EST


rtw_enqueue_cmd() uses a semaphore to notify rtw_cmd_thread() that it
has enqueued commands. rtw_cmd_thread() "down(s)" in interruptible mode
to wait to be notified.

Use completion variables because they are better suited for the purpose.

In rtw_cmd_thread(), wait in killable mode because there are no other
reasons to interrupt waiting if not for killing.

Signed-off-by: Fabio M. De Francesco <fmdefrancesco@xxxxxxxxx>
---
drivers/staging/r8188eu/core/rtw_cmd.c | 6 +++---
drivers/staging/r8188eu/include/rtw_cmd.h | 2 +-
drivers/staging/r8188eu/os_dep/os_intfs.c | 2 +-
3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_cmd.c b/drivers/staging/r8188eu/core/rtw_cmd.c
index 195390449502..2900c31d8ec9 100644
--- a/drivers/staging/r8188eu/core/rtw_cmd.c
+++ b/drivers/staging/r8188eu/core/rtw_cmd.c
@@ -21,7 +21,7 @@ static int _rtw_init_cmd_priv(struct cmd_priv *pcmdpriv)
{
int res = _SUCCESS;

- sema_init(&pcmdpriv->cmd_queue_sema, 0);
+ init_completion(&pcmdpriv->enqueue_cmd);
/* sema_init(&(pcmdpriv->cmd_done_sema), 0); */
init_completion(&pcmdpriv->start_cmd_thread);
init_completion(&pcmdpriv->stop_cmd_thread);
@@ -198,7 +198,7 @@ u32 rtw_enqueue_cmd(struct cmd_priv *pcmdpriv, struct cmd_obj *cmd_obj)
res = _rtw_enqueue_cmd(&pcmdpriv->cmd_queue, cmd_obj);

if (res == _SUCCESS)
- up(&pcmdpriv->cmd_queue_sema);
+ complete(&pcmdpriv->enqueue_cmd);

exit:

@@ -252,7 +252,7 @@ int rtw_cmd_thread(void *context)
complete(&pcmdpriv->start_cmd_thread);

while (1) {
- if (_rtw_down_sema(&pcmdpriv->cmd_queue_sema) == _FAIL)
+ if (wait_for_completion_killable(&pcmdpriv->enqueue_cmd))
break;

if (padapter->bDriverStopped ||
diff --git a/drivers/staging/r8188eu/include/rtw_cmd.h b/drivers/staging/r8188eu/include/rtw_cmd.h
index b6266e3e2c40..47c3c80cc24a 100644
--- a/drivers/staging/r8188eu/include/rtw_cmd.h
+++ b/drivers/staging/r8188eu/include/rtw_cmd.h
@@ -33,7 +33,7 @@ struct cmd_obj {
};

struct cmd_priv {
- struct semaphore cmd_queue_sema;
+ struct completion enqueue_cmd;
struct completion start_cmd_thread;
struct completion stop_cmd_thread;
struct __queue cmd_queue;
diff --git a/drivers/staging/r8188eu/os_dep/os_intfs.c b/drivers/staging/r8188eu/os_dep/os_intfs.c
index 0bcea66f550b..96e9897085fe 100644
--- a/drivers/staging/r8188eu/os_dep/os_intfs.c
+++ b/drivers/staging/r8188eu/os_dep/os_intfs.c
@@ -394,7 +394,7 @@ u32 rtw_start_drv_threads(struct adapter *padapter)
void rtw_stop_drv_threads(struct adapter *padapter)
{
/* Below is to termindate rtw_cmd_thread & event_thread... */
- up(&padapter->cmdpriv.cmd_queue_sema);
+ complete(&padapter->cmdpriv.enqueue_cmd);
if (padapter->cmdThread)
/* wait for rtw_cmd_thread() to stop running */
wait_for_completion(&padapter->cmdpriv.stop_cmd_thread);
--
2.33.0