From patchwork Fri Feb 3 08:37:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mad Horse X-Patchwork-Id: 13127172 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B83D0C61DA4 for ; Fri, 3 Feb 2023 08:38:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231240AbjBCIih (ORCPT ); Fri, 3 Feb 2023 03:38:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44836 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231307AbjBCIig (ORCPT ); Fri, 3 Feb 2023 03:38:36 -0500 Received: from smtp161.vfemail.net (smtp161.vfemail.net [146.59.185.161]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21F9F79C91 for ; Fri, 3 Feb 2023 00:38:31 -0800 (PST) Received: (qmail 21243 invoked from network); 3 Feb 2023 08:38:30 +0000 Received: from localhost (HELO nl101-3.vfemail.net) () by smtpout.vfemail.net with ESMTPS (ECDHE-RSA-AES256-GCM-SHA384 encrypted); 3 Feb 2023 08:38:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple; d=openmail.cc; h=from:to:cc :subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; s=2018; bh=sKeY59QN/akZNkbUpqrT33k7Q 8PHn/p9w1ND4ntYpHI=; b=fiY7rbHVviErOElR0cuVRmdximttvMvtx0+npKHJT x/zW7ESufeaLKysmY9XB8cEMrZ8IEetLXWzTkplipL21W+cmqXPfghiyWurvq/0k XZuNS4BAl/N+VqnaziEQkMRYERdyydTZPHSQHv5WJhvSCCTChjJINFMKJKmxBMv9 g8= Received: (qmail 36023 invoked from network); 3 Feb 2023 08:38:29 -0000 Received: by simscan 1.4.0 ppid: 35085, pid: 35935, t: 1.4564s scanners:none Received: from unknown (HELO bmwxMDEudmZlbWFpbC5uZXQ=) (ZXF1dUBvcGVubWFpbC5jYw==@MTkyLjE2OC4xLjE5Mg==) by nl101.vfemail.net with ESMTPA; 3 Feb 2023 08:38:28 -0000 From: equu@openmail.cc To: lpieralisi@kernel.org, toke@toke.dk, kvalo@kernel.org Cc: linux-pci@vger.kernel.org, robh@kernel.org, linux-wireless@vger.kernel.org, ath10k@lists.infradead.org, equu@openmail.cc Subject: [PATCH v4 2/3] wifi: ath9k: stop loading incompatible DT cal data Date: Fri, 3 Feb 2023 16:37:30 +0800 Message-Id: <20230203083731.349695-3-equu@openmail.cc> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230203083731.349695-1-equu@openmail.cc> References: <20230203083731.349695-1-equu@openmail.cc> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Edward Chow As reported in https://github.com/openwrt/openwrt/pull/11345 , ath9k would load calibration data from a device tree node declared incompatible. Now, ath9k will first check whether the device tree node is compatible with it, using the functionality introduced with the first patch of this series, ("PCI: of: Match pci devices or drivers against OF DT nodes") and only proceed loading calibration data from compatible node. Signed-off-by: Edward Chow --- drivers/net/wireless/ath/ath9k/ath9k.h | 1 + drivers/net/wireless/ath/ath9k/init.c | 26 ++++++++++++++++++++++++++ drivers/net/wireless/ath/ath9k/pci.c | 2 +- 3 files changed, 28 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h index 2cc23605c9fc..4f6f0383a5f8 100644 --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -35,6 +35,7 @@ struct ath_node; struct ath_vif; extern struct ieee80211_ops ath9k_ops; +extern struct pci_driver ath_pci_driver; extern int ath9k_modparam_nohwcrypt; extern int ath9k_led_blink; extern bool is_ath9k_unloaded; diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c index 4f00400c7ffb..6c0296b4d366 100644 --- a/drivers/net/wireless/ath/ath9k/init.c +++ b/drivers/net/wireless/ath/ath9k/init.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -577,6 +578,31 @@ static int ath9k_nvmem_request_eeprom(struct ath_softc *sc) size_t len; int err; + /* devm_nvmem_cell_get() will get a cell first from the OF + * DT node representing the given device with nvmem-cell-name + * "calibration", and from the global lookup table as a fallback, + * and an ath9k device could be either a pci one or a platform one. + * + * If the OF DT node is not compatible with the real device, the + * calibration data got from the node should not be applied. + * + * dev_is_pci(sc->dev) && ( no OF node || caldata not from node + * || not compatible ) -> do not use caldata . + * + * !dev_is_pci(sc->dev) -> always use caldata . + */ + if (dev_is_pci(sc->dev) && + (!sc->dev->of_node || + !of_property_match_string(sc->dev->of_node, + "nvmem-cell-names", + "calibration") || + !of_pci_node_match_driver(sc->dev->of_node, + &ath_pci_driver))) + /* follow the "just return 0;" convention as + * noted below. + */ + return 0; + cell = devm_nvmem_cell_get(sc->dev, "calibration"); if (IS_ERR(cell)) { err = PTR_ERR(cell); diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c index a074e23013c5..fcb19761e60d 100644 --- a/drivers/net/wireless/ath/ath9k/pci.c +++ b/drivers/net/wireless/ath/ath9k/pci.c @@ -1074,7 +1074,7 @@ static SIMPLE_DEV_PM_OPS(ath9k_pm_ops, ath_pci_suspend, ath_pci_resume); MODULE_DEVICE_TABLE(pci, ath_pci_id_table); -static struct pci_driver ath_pci_driver = { +struct pci_driver ath_pci_driver = { .name = "ath9k", .id_table = ath_pci_id_table, .probe = ath_pci_probe,