[PATCH v3 2/5] wifi: rtw88: rx: mark zero length packets on RTL8723BS

[luka.gejak@linux.dev]

From: Luka Gejak <luka.gejak@linux.dev>

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 <straube.linux@gmail.com>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Luka Gejak <luka.gejak@linux.dev>
---
 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..a9361ef4b93c 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 ((rtwdev->chip->id == RTW_CHIP_TYPE_8703B || rtw_is_8723bs(rtwdev)) &&
+	    pkt_stat->pkt_len == 0) {
 		rx_status->flag |= RX_FLAG_NO_PSDU;
 		rtw_dbg(rtwdev, RTW_DBG_RX, "zero length packet");
 	}
-- 
2.53.0