[RFT PATCH v3 4/5] staging: rtl8723bs: use read_poll_timeout_atomic in _is_fw_read_cmd_down

[Prithvi Tambewagh <activprithvi@gmail.com>]

Replace the existing rtw_read8() and do-while loop mechanism with
read_poll_timeout_atomic() from <linux/iopoll.h>, in _is_fw_read_cmd_down()
which is a standard Linux macro, ensuring polling REG_HMETFR efficiently.

Signed-off-by: Prithvi Tambewagh <activprithvi@gmail.com>
---
 drivers/staging/rtl8723bs/hal/rtl8723b_cmd.c | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/rtl8723bs/hal/rtl8723b_cmd.c b/drivers/staging/rtl8723bs/hal/rtl8723b_cmd.c
index af6cdda8238d..17e135cd3e0e 100644
--- a/drivers/staging/rtl8723bs/hal/rtl8723b_cmd.c
+++ b/drivers/staging/rtl8723bs/hal/rtl8723b_cmd.c
@@ -8,6 +8,7 @@
 #include <drv_types.h>
 #include <rtl8723b_hal.h>
 #include <linux/etherdevice.h>
+#include <linux/iopoll.h>
 #include "hal_com_h2c.h"
 
 #define MAX_H2C_BOX_NUMS	4
@@ -18,20 +19,15 @@
 
 static u8 _is_fw_read_cmd_down(struct adapter *padapter, u8 msgbox_num)
 {
-	u8 read_down = false;
-	int retry_cnts = 100;
-
 	u8 valid;
+	int ret;
 
-	do {
-		valid = rtw_read8(padapter, REG_HMETFR) & BIT(msgbox_num);
-		if (0 == valid) {
-			read_down = true;
-		}
-	} while ((!read_down) && (retry_cnts--));
-
-	return read_down;
+	ret = read_poll_timeout_atomic(rtw_read8,
+				       valid, !(valid & BIT(msgbox_num)),
+				       0, 500, false,
+				       padapter, REG_HMETFR);
 
+	return !ret;
 }
 
 
-- 
2.34.1