wifi: ath12k: Fix memory leak in rx_desc and tx_desc

Currently when ath12k_dp_cc_desc_init() is called we allocate
memory to rx_descs and tx_descs. In ath12k_dp_cc_cleanup(), during
descriptor cleanup rx_descs and tx_descs memory is not freed.

This is cause of memory leak. These allocated memory should be
freed in ath12k_dp_cc_cleanup.

In ath12k_dp_cc_desc_init(), we can save base address of rx_descs
and tx_descs. In ath12k_dp_cc_cleanup(), we can free rx_descs and
tx_descs memory using their base address.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
Signed-off-by: Rajat Soni <quic_rajson@quicinc.com>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20230718053510.30894-1-quic_rajson@quicinc.com

drivers/net/wireless/ath/ath12k/dp.c

@@ -1129,6 +1129,7 @@ static void ath12k_dp_cc_cleanup(struct ath12k_base *ab)
 	struct ath12k_dp *dp = &ab->dp;
 	struct sk_buff *skb;
 	int i;
+	u32 pool_id, tx_spt_page;
 
 	if (!dp->spt_info)
 		return;
@@ -1148,6 +1149,14 @@ static void ath12k_dp_cc_cleanup(struct ath12k_base *ab)
 		dev_kfree_skb_any(skb);
 	}
 
+	for (i = 0; i < ATH12K_NUM_RX_SPT_PAGES; i++) {
+		if (!dp->spt_info->rxbaddr[i])
+			continue;
+
+		kfree(dp->spt_info->rxbaddr[i]);
+		dp->spt_info->rxbaddr[i] = NULL;
+	}
+
 	spin_unlock_bh(&dp->rx_desc_lock);
 
 	/* TX Descriptor cleanup */
@@ -1170,6 +1179,21 @@ static void ath12k_dp_cc_cleanup(struct ath12k_base *ab)
 		spin_unlock_bh(&dp->tx_desc_lock[i]);
 	}
 
+	for (pool_id = 0; pool_id < ATH12K_HW_MAX_QUEUES; pool_id++) {
+		spin_lock_bh(&dp->tx_desc_lock[pool_id]);
+
+		for (i = 0; i < ATH12K_TX_SPT_PAGES_PER_POOL; i++) {
+			tx_spt_page = i + pool_id * ATH12K_TX_SPT_PAGES_PER_POOL;
+			if (!dp->spt_info->txbaddr[tx_spt_page])
+				continue;
+
+			kfree(dp->spt_info->txbaddr[tx_spt_page]);
+			dp->spt_info->txbaddr[tx_spt_page] = NULL;
+		}
+
+		spin_unlock_bh(&dp->tx_desc_lock[pool_id]);
+	}
+
 	/* unmap SPT pages */
 	for (i = 0; i < dp->num_spt_pages; i++) {
 		if (!dp->spt_info[i].vaddr)
@@ -1343,6 +1367,8 @@ static int ath12k_dp_cc_desc_init(struct ath12k_base *ab)
 			return -ENOMEM;
 		}
 
+		dp->spt_info->rxbaddr[i] = &rx_descs[0];
+
 		for (j = 0; j < ATH12K_MAX_SPT_ENTRIES; j++) {
 			rx_descs[j].cookie = ath12k_dp_cc_cookie_gen(i, j);
 			rx_descs[j].magic = ATH12K_DP_RX_DESC_MAGIC;
@@ -1368,8 +1394,10 @@ static int ath12k_dp_cc_desc_init(struct ath12k_base *ab)
 				return -ENOMEM;
 			}
 
-			for (j = 0; j < ATH12K_MAX_SPT_ENTRIES; j++) {
 			tx_spt_page = i + pool_id * ATH12K_TX_SPT_PAGES_PER_POOL;
+			dp->spt_info->txbaddr[tx_spt_page] = &tx_descs[0];
+
+			for (j = 0; j < ATH12K_MAX_SPT_ENTRIES; j++) {
 				ppt_idx = ATH12K_NUM_RX_SPT_PAGES + tx_spt_page;
 				tx_descs[j].desc_id = ath12k_dp_cc_cookie_gen(ppt_idx, j);
 				tx_descs[j].pool_id = pool_id;

drivers/net/wireless/ath/ath12k/dp.h

@@ -289,6 +289,8 @@ struct ath12k_tx_desc_info {
 struct ath12k_spt_info {
 	dma_addr_t paddr;
 	u64 *vaddr;
+	struct ath12k_rx_desc_info *rxbaddr[ATH12K_NUM_RX_SPT_PAGES];
+	struct ath12k_tx_desc_info *txbaddr[ATH12K_NUM_TX_SPT_PAGES];
 };
 
 struct ath12k_reo_queue_ref {