[PATCH v11 2/7] wifi: rtw88: rx: mark zero length packets on RTL8723BS

From: Luka Gejak <redacted>

Like the RTL8703B, the RTL8723BS reports receive descriptors with a zero
packet length, which the vendor driver drops outright. rtw88 already
flags these as having no PSDU for the RTL8703B, so extend the same
handling rather than passing an empty frame up.

This is gated on the SDIO interface rather than the chip id, because it
has only been observed there; the USB variant is not known to do it.

Co-developed-by: Michael Straube <redacted>
Signed-off-by: Michael Straube <redacted>
Signed-off-by: Luka Gejak <redacted>
Acked-by: Ping-Ke Shih <pkshih@realtek.com>
---

Notes:
    Changes in v11: none.
    Changes in v10: none.
    Changes in v9: none.
    Changes in v8: none.
    Changes in v7: none.
    Changes in v6: none.
    Changes in v5: the zero length test now evaluates pkt_stat->pkt_len
    first, so the unlikely case short circuits before the chip test.

 drivers/net/wireless/realtek/rtw88/rx.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/rx.c b/drivers/net/wireless/realtek/rtw88/rx.c
index 01fd299abb7f..fde21c840ac0 100644
--- a/drivers/net/wireless/realtek/rtw88/rx.c
+++ b/drivers/net/wireless/realtek/rtw88/rx.c

@@ -253,10 +253,12 @@ static void rtw_rx_fill_rx_status(struct rtw_dev *rtwdev,
 
 	rtw_rx_addr_match(rtwdev, pkt_stat, hdr);
 
-	/* Rtl8723cs driver checks for size < 14 or size > 8192 and
-	 * simply drops the packet.
+	/*
+	 * Rtl8723cs and rtl8723bs drivers check for size < 14 or size > 8192
+	 * and simply drop the packet.
 	 */
-	if (rtwdev->chip->id == RTW_CHIP_TYPE_8703B && pkt_stat->pkt_len == 0) {
+	if (pkt_stat->pkt_len == 0 &&
+	    (rtwdev->chip->id == RTW_CHIP_TYPE_8703B || rtw_is_8723bs(rtwdev))) {
 		rx_status->flag |= RX_FLAG_NO_PSDU;
 		rtw_dbg(rtwdev, RTW_DBG_RX, "zero length packet");
 	}

-- 
2.55.0