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Fri, 04 Sep 2026 11:53:09 -0700 (PDT) Sender: N B From: =?UTF-8?q?Nerijus=20Bend=C5=BEi=C5=ABnas?= To: =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , linux-wireless@vger.kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH v3 1/5] wifi: ath9k_htc: report a failed multi-read as all ones Date: Fri, 4 Sep 2026 21:52:49 +0300 Message-ID: <20260904185253.809209-2-nerijus.bendziunas@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904185253.809209-1-nerijus.bendziunas@gmail.com> References: <20260904185253.809209-1-nerijus.bendziunas@gmail.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When the WMI command fails or times out, ath9k_multi_regread() logs the failure and still copies its result buffer to the caller, so the caller receives uninitialised stack data for every register it asked for. ath9k_hw_update_mibstats(), ath9k_hw_usb_gen_fill_eeprom() and ath9k_hw_read_array() all read through this path. ath9k_regread() reports the same failure as -1. Fill the caller's buffer with all ones instead, so a failed multi-read looks like a failed single read. ath9k_hw_first_txpending(), added later in this series, relies on this: a timed-out tx queue status read must count as frames pending. Fixes: 09a525d33870 ("ath9k_htc: Add multiple register read API") Cc: stable@vger.kernel.org Assisted-by: Claude:claude-fable-5-1 Signed-off-by: Nerijus Bendžiūnas --- drivers/net/wireless/ath/ath9k/htc_drv_init.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_init.c b/drivers/net/wireless/ath/ath9k/htc_drv_init.c index 6de78ae85726..f5844e9bdd2d 100644 --- a/drivers/net/wireless/ath/ath9k/htc_drv_init.c +++ b/drivers/net/wireless/ath/ath9k/htc_drv_init.c @@ -273,6 +273,9 @@ static void ath9k_multi_regread(void *hw_priv, u32 *addr, if (unlikely(ret)) { ath_dbg(common, WMI, "Multiple REGISTER READ FAILED (count: %d)\n", count); + /* Callers expect what a failed single read returns. */ + memset(val, 0xff, sizeof(*val) * count); + return; } for (i = 0; i < count; i++) { -- 2.55.0