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From: Nathan Chancellor <nathan@kernel.org>
Date: Mon, 05 Feb 2024 12:49:53 -0700
Subject: [PATCH] wifi: ath12k: Fix uninitialized use of ret in
 ath12k_mac_allocate()
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Message-Id: <20240205-ath12k-mac-wuninitialized-v1-1-3fda7b17357f@kernel.org>
To: kvalo@kernel.org, quic_jjohnson@quicinc.com
Cc: morbo@google.com, justinstitt@google.com, quic_periyasa@quicinc.com, 
 ath12k@lists.infradead.org, linux-wireless@vger.kernel.org, 
 llvm@lists.linux.dev, patches@lists.linux.dev, 
 Nathan Chancellor <nathan@kernel.org>

Clang warns (or errors with CONFIG_WERROR=y):

  drivers/net/wireless/ath/ath12k/mac.c:8060:9: error: variable 'ret' is uninitialized when used here [-Werror,-Wuninitialized]
   8060 |         return ret;
        |                ^~~
  drivers/net/wireless/ath/ath12k/mac.c:8022:9: note: initialize the variable 'ret' to silence this warning
   8022 |         int ret, i, j;
        |                ^
        |                 = 0
  1 error generated.

Commit 6db6e70a17f6 ("wifi: ath12k: Introduce the container for mac80211
hw") added a completely uninitialized use of ret. Prior to that change,
-ENOMEM was returned to the callers of ath12k_mac_allocate() whenever
ath12k_mac_hw_allocate() failed. Assign that value to ret to make sure
it is always initialized when used and clear up the warning.

Closes: https://github.com/ClangBuiltLinux/linux/issues/1989i
Fixes: 6db6e70a17f6 ("wifi: ath12k: Introduce the container for mac80211 hw")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 drivers/net/wireless/ath/ath12k/mac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index fb5bf500ed87..4b0521e8fb26 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -8038,6 +8038,7 @@ int ath12k_mac_allocate(struct ath12k_base *ab)
 		if (!ah) {
 			ath12k_warn(ab, "failed to allocate mac80211 hw device for hw_idx %d\n",
 				    i);
+			ret = -ENOMEM;
 			goto err;
 		}
 

---
base-commit: b82fb7ef690bd929b88d9aab1d191ff502ed9029
change-id: 20240205-ath12k-mac-wuninitialized-1bc5faf17d29

Best regards,
-- 
Nathan Chancellor <nathan@kernel.org>