rtw89: update partition size of firmware header on skb->data

The partition size is used to tell hardware the size of piece we are going
to send a firmware. The old code updates the size in constant buffer of
firmware, and leads system crash.

To fix this, update the size on skb->data after we copy the firmware data
into skb.

Buglink: https://bugzilla.opensuse.org/show_bug.cgi?id=1188303
Fixes: e3ec7017 ("rtw89: add Realtek 802.11ax driver")
Reported-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Tested-by: Takashi Iwai <tiwai@suse.de>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20211119054512.10620-2-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/fw.c

@@ -91,7 +91,6 @@ static int rtw89_fw_hdr_parser(struct rtw89_dev *rtwdev, const u8 *fw, u32 len,
 	info->section_num = GET_FW_HDR_SEC_NUM(fw);
 	info->hdr_len = RTW89_FW_HDR_SIZE +
 			info->section_num * RTW89_FW_SECTION_HDR_SIZE;
-	SET_FW_HDR_PART_SIZE(fw, FWDL_SECTION_PER_PKT_LEN);
 
 	bin = fw + info->hdr_len;
 
@@ -275,6 +274,7 @@ static int __rtw89_fw_download_hdr(struct rtw89_dev *rtwdev, const u8 *fw, u32 l
 	}
 
 	skb_put_data(skb, fw, len);
+	SET_FW_HDR_PART_SIZE(skb->data, FWDL_SECTION_PER_PKT_LEN);
 	rtw89_h2c_pkt_set_hdr_fwdl(rtwdev, skb, FWCMD_TYPE_H2C,
 				   H2C_CAT_MAC, H2C_CL_MAC_FWDL,
 				   H2C_FUNC_MAC_FWHDR_DL, len);

drivers/net/wireless/realtek/rtw89/fw.h

@@ -282,8 +282,10 @@ struct rtw89_h2creg_sch_tx_en {
 	le32_get_bits(*((__le32 *)(fwhdr) + 6), GENMASK(15, 8))
 #define GET_FW_HDR_CMD_VERSERION(fwhdr)	\
 	le32_get_bits(*((__le32 *)(fwhdr) + 7), GENMASK(31, 24))
-#define SET_FW_HDR_PART_SIZE(fwhdr, val)	\
-	le32p_replace_bits((__le32 *)(fwhdr) + 7, val, GENMASK(15, 0))
+static inline void SET_FW_HDR_PART_SIZE(void *fwhdr, u32 val)
+{
+	le32p_replace_bits((__le32 *)fwhdr + 7, val, GENMASK(15, 0));
+}
 
 #define SET_CTRL_INFO_MACID(table, val) \
 	le32p_replace_bits((__le32 *)(table) + 0, val, GENMASK(6, 0))