wifi: rtw89: debug: avoid invalid access on RTW89_DBG_SEL_MAC_30

Only 8852C chip has valid pages on RTW89_DBG_SEL_MAC_30. To other chips,
this section is an address hole. It will lead to crash if trying to access
this section on chips except for 8852C. So, we avoid that.

Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230119063529.61563-2-pkshih@realtek.com

diff --git a/drivers/net/wireless/realtek/rtw89/debug.c b/drivers/net/wireless/realtek/rtw89/debug.c
index 8297e35..6730eea 100644 (file)
--- a/drivers/net/wireless/realtek/rtw89/debug.c
+++ b/drivers/net/wireless/realtek/rtw89/debug.c
@@ -615,6 +615,7 @@ rtw89_debug_priv_mac_reg_dump_select(struct file *filp,
        struct seq_file *m = (struct seq_file *)filp->private_data;
        struct rtw89_debugfs_priv *debugfs_priv = m->private;
        struct rtw89_dev *rtwdev = debugfs_priv->rtwdev;
+       const struct rtw89_chip_info *chip = rtwdev->chip;
        char buf[32];
        size_t buf_size;
        int sel;
@@ -634,6 +635,12 @@ rtw89_debug_priv_mac_reg_dump_select(struct file *filp,
                return -EINVAL;
        }
 
+       if (sel == RTW89_DBG_SEL_MAC_30 && chip->chip_id != RTL8852C) {
+               rtw89_info(rtwdev, "sel %d is address hole on chip %d\n", sel,
+                          chip->chip_id);
+               return -EINVAL;
+       }
+
        debugfs_priv->cb_data = sel;
        rtw89_info(rtwdev, "select mac page dump %d\n", debugfs_priv->cb_data);