rtlwifi: rtl8192ce: Fix kernel crashes due to missing callback entry

In the major update of the rtlwifi-family of drivers, one of the callback entries
was missed, which leads to memory corruption. Unfortunately, this corruption
never caused a kernel oops, but showed up in other parts of the system.
This patch is one of three needed to fix the kernel regression reported at
https://bugzilla.kernel.org/show_bug.cgi?id=88951.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Reported-by: Catalin Iacob <iacobcatalin@gmail.com>
Tested-by: Catalin Iacob <iacobcatalin@gmail.com>
Cc: Catalin Iacob <iacobcatalin@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 22 insertions, 0 deletions

diff --git a/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c b/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c
index 46ea07605eb4..dd5aa089126a 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192ce/sw.c
@@ -228,6 +228,7 @@ static struct rtl_hal_ops rtl8192ce_hal_ops = {
         .led_control = rtl92ce_led_control,
         .set_desc = rtl92ce_set_desc,
         .get_desc = rtl92ce_get_desc,
+        .is_tx_desc_closed = rtl92ce_is_tx_desc_closed,
         .tx_polling = rtl92ce_tx_polling,
         .enable_hw_sec = rtl92ce_enable_hw_security_config,
         .set_key = rtl92ce_set_key,
@@ -271,6 +272,8 @@ static struct rtl_hal_cfg rtl92ce_hal_cfg = {
         .maps[MAC_RCR_ACRC32] = ACRC32,
         .maps[MAC_RCR_ACF] = ACF,
         .maps[MAC_RCR_AAP] = AAP,
+        .maps[MAC_HIMR] = REG_HIMR,
+        .maps[MAC_HIMRE] = REG_HIMRE,
 
         .maps[EFUSE_TEST] = REG_EFUSE_TEST,
         .maps[EFUSE_CTRL] = REG_EFUSE_CTRL,
diff --git a/drivers/net/wireless/rtlwifi/rtl8192ce/trx.c b/drivers/net/wireless/rtlwifi/rtl8192ce/trx.c
index 0916275c7362..e88dcd0e0af1 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192ce/trx.c
+++ b/drivers/net/wireless/rtlwifi/rtl8192ce/trx.c
@@ -739,6 +739,23 @@ u32 rtl92ce_get_desc(u8 *p_desc, bool istx, u8 desc_name)
         return ret;
 }
 
+bool rtl92ce_is_tx_desc_closed(struct ieee80211_hw *hw,
+                               u8 hw_queue, u16 index)
+{
+        struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw));
+        struct rtl8192_tx_ring *ring = &rtlpci->tx_ring[hw_queue];
+        u8 *entry = (u8 *)(&ring->desc[ring->idx]);
+        u8 own = (u8)rtl92ce_get_desc(entry, true, HW_DESC_OWN);
+
+        /*beacon packet will only use the first
+         *descriptor defautly,and the own may not
+         *be cleared by the hardware
+         */
+        if (own)
+                return false;
+        return true;
+}
+
 void rtl92ce_tx_polling(struct ieee80211_hw *hw, u8 hw_queue)
 {
         struct rtl_priv *rtlpriv = rtl_priv(hw);
diff --git a/drivers/net/wireless/rtlwifi/rtl8192ce/trx.h b/drivers/net/wireless/rtlwifi/rtl8192ce/trx.h
index 9a39ec4204dd..4bec4b07e3e0 100644
--- a/drivers/net/wireless/rtlwifi/rtl8192ce/trx.h
+++ b/drivers/net/wireless/rtlwifi/rtl8192ce/trx.h
@@ -723,6 +723,8 @@ bool rtl92ce_rx_query_desc(struct ieee80211_hw *hw,
 void rtl92ce_set_desc(struct ieee80211_hw *hw, u8 *pdesc, bool istx,
                       u8 desc_name, u8 *val);
 u32 rtl92ce_get_desc(u8 *pdesc, bool istx, u8 desc_name);
+bool rtl92ce_is_tx_desc_closed(struct ieee80211_hw *hw,
+                               u8 hw_queue, u16 index);
 void rtl92ce_tx_polling(struct ieee80211_hw *hw, u8 hw_queue);
 void rtl92ce_tx_fill_cmddesc(struct ieee80211_hw *hw, u8 *pdesc,
                              bool b_firstseg, bool b_lastseg,