From 7210b4b77fe47697890d2d3b2ce57ac9f767bffc Mon Sep 17 00:00:00 2001 From: Tim Gardner Date: Tue, 5 Oct 2021 16:55:54 +0300 Subject: [PATCH] ath11k: Remove unused variable in ath11k_dp_rx_mon_merg_msdus() Coverity complains that a constant variable guards dead code. In fact, mpdu_buf is set NULL and never updated. 4834err_merge_fail: null: At condition mpdu_buf, the value of mpdu_buf must be NULL. dead_error_condition: The condition mpdu_buf cannot be true. CID 92162 (#1 of 1): 'Constant' variable guards dead code (DEADCODE) dead_error_line: Execution cannot reach the expression decap_format != DP_RX_DECAP_TYPE_RAW inside this statement: if (mpdu_buf && decap_forma.... Local variable mpdu_buf is assigned only once, to a constant value, making it effectively constant throughout its scope. If this is not the intent, examine the logic to see if there is a missing assignment that would make mpdu_buf not remain constant. 4835 if (mpdu_buf && decap_format != DP_RX_DECAP_TYPE_RAW) { Fix this by removing mpdu_buf and unreachable code. Cc: Kalle Valo Cc: "David S. Miller" Cc: Jakub Kicinski Cc: ath11k@lists.infradead.org Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Tim Gardner Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20210927150743.19816-1-tim.gardner@canonical.com --- drivers/net/wireless/ath/ath11k/dp_rx.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index 75f6d55..1232bbe 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -4828,7 +4828,7 @@ ath11k_dp_rx_mon_merg_msdus(struct ath11k *ar, struct ieee80211_rx_status *rxs) { struct ath11k_base *ab = ar->ab; - struct sk_buff *msdu, *mpdu_buf, *prev_buf; + struct sk_buff *msdu, *prev_buf; u32 wifi_hdr_len; struct hal_rx_desc *rx_desc; char *hdr_desc; @@ -4836,8 +4836,6 @@ ath11k_dp_rx_mon_merg_msdus(struct ath11k *ar, struct ieee80211_hdr_3addr *wh; struct rx_attention *rx_attention; - mpdu_buf = NULL; - if (!head_msdu) goto err_merge_fail; @@ -4920,12 +4918,6 @@ ath11k_dp_rx_mon_merg_msdus(struct ath11k *ar, return head_msdu; err_merge_fail: - if (mpdu_buf && decap_format != DP_RX_DECAP_TYPE_RAW) { - ath11k_dbg(ab, ATH11K_DBG_DATA, - "err_merge_fail mpdu_buf %pK", mpdu_buf); - /* Free the head buffer */ - dev_kfree_skb_any(mpdu_buf); - } return NULL; } -- 2.7.4