From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 14D89393DD1; Tue, 26 Aug 2025 11:38:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756208303; cv=none; b=XCU+3o/1uOOp1wX9LA2LNxhmAQxcRk2pQI9ZcW0g7zFhu+tCtA7Sq7BK2rRKT95qtmMrOR3/Mj4oTru+VNbvRJZyl3v9O69OOH373TugoM2xIHFKdW4lwGx7wl7/Oaj5GzCuYOVp3FnuTtzR0tz3XUv9fsT3KJXaHBOt557KBDs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756208303; c=relaxed/simple; bh=deUyYWHBVrO8BWEPJsuimi/m+x36l3jKT0HpTqeKSM8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YlOedPMbTYEJYk14xepPevKMu8YZwgPku/+m/s67C6ey8IFjvvidbZfXKZ3OhHPajKptbQU1ABsTeKoGoadl9W1ha+1rYMUF+kSL8IfutcVWNqmmUaTNXY7hXzt97f1uxbeB+vzzQ/9XSlQbyaudK4Xw5PN47Bo/laast562Sho= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=f/nkEs3P; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="f/nkEs3P" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4378BC4CEF1; Tue, 26 Aug 2025 11:38:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756208302; bh=deUyYWHBVrO8BWEPJsuimi/m+x36l3jKT0HpTqeKSM8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=f/nkEs3Pt4QF8UWlqoeiIvZpVAt2oSONbO2o8MzRBUe/Q0nibz+cRWPQanZislywS Zq5dC+wMojO0Mni7hqJqVfa3vo4o7wCuCbDShWmuXliSZLa/tbHtwC7e5h+9jBQAQA uONy8GCpgr+EJMHYpkiv6FSEl+kV1CufwTqve/fU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Johan Hovold , Baochen Qiang , Jeff Johnson Subject: [PATCH 6.12 059/322] wifi: ath12k: fix dest ring-buffer corruption Date: Tue, 26 Aug 2025 13:07:54 +0200 Message-ID: <20250826110916.991745672@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110915.169062587@linuxfoundation.org> References: <20250826110915.169062587@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 8157ce533a60521f21d466eb4de45d9735b19484 upstream. Add the missing memory barrier to make sure that destination ring descriptors are read after the head pointers to avoid using stale data on weakly ordered architectures like aarch64. The barrier is added to the ath12k_hal_srng_access_begin() helper for symmetry with follow-on fixes for source ring buffer corruption which will add barriers to ath12k_hal_srng_access_end(). Tested-on: WCN7850 hw2.0 WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3 Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices") Cc: stable@vger.kernel.org # 6.3 Signed-off-by: Johan Hovold Reviewed-by: Baochen Qiang Link: https://patch.msgid.link/20250617084402.14475-2-johan+linaro@kernel.org Signed-off-by: Jeff Johnson Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/ath/ath12k/ce.c | 3 --- drivers/net/wireless/ath/ath12k/hal.c | 17 ++++++++++++++--- 2 files changed, 14 insertions(+), 6 deletions(-) --- a/drivers/net/wireless/ath/ath12k/ce.c +++ b/drivers/net/wireless/ath/ath12k/ce.c @@ -343,9 +343,6 @@ static int ath12k_ce_completed_recv_next goto err; } - /* Make sure descriptor is read after the head pointer. */ - dma_rmb(); - *nbytes = ath12k_hal_ce_dst_status_get_length(desc); *skb = pipe->dest_ring->skb[sw_index]; --- a/drivers/net/wireless/ath/ath12k/hal.c +++ b/drivers/net/wireless/ath/ath12k/hal.c @@ -2107,13 +2107,24 @@ void *ath12k_hal_srng_src_get_next_reape void ath12k_hal_srng_access_begin(struct ath12k_base *ab, struct hal_srng *srng) { + u32 hp; + lockdep_assert_held(&srng->lock); - if (srng->ring_dir == HAL_SRNG_DIR_SRC) + if (srng->ring_dir == HAL_SRNG_DIR_SRC) { srng->u.src_ring.cached_tp = *(volatile u32 *)srng->u.src_ring.tp_addr; - else - srng->u.dst_ring.cached_hp = READ_ONCE(*srng->u.dst_ring.hp_addr); + } else { + hp = READ_ONCE(*srng->u.dst_ring.hp_addr); + + if (hp != srng->u.dst_ring.cached_hp) { + srng->u.dst_ring.cached_hp = hp; + /* Make sure descriptor is read after the head + * pointer. + */ + dma_rmb(); + } + } } /* Update cached ring head/tail pointers to HW. ath12k_hal_srng_access_begin()