From nobody Thu Sep 4 03:32:51 2025 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 7B847C54EE9 for ; Tue, 13 Sep 2022 15:06:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235296AbiIMPF6 (ORCPT ); Tue, 13 Sep 2022 11:05:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235299AbiIMPEC (ORCPT ); Tue, 13 Sep 2022 11:04:02 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07C49696FD; Tue, 13 Sep 2022 07:30:05 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 2E9B0B80F6F; Tue, 13 Sep 2022 14:29:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82DA2C433D7; Tue, 13 Sep 2022 14:29:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1663079393; bh=O22YGpNSVP/wLRaLSzlif/umKtjAznEDVhjKZHUob+w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cVQJH45tMkq1MpMnB6tnyRbdiUHJn8rZx+ExxZLKn9Oz6a+UtkNnmkcrHBPaOCOCe 9AJWYZfVow59cxd95grY7njHMXw4axmaZPoaGXMfTUfX6EW+1dUpayV/YZtag6Jb+C qhhkRAxqX3k5iJqthCuoBRObjBo32xauukBaVsnE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Saravana Kannan , Guenter Roeck , Linus Walleij , "Isaac J. Manjarres" Subject: [PATCH 4.19 01/79] driver core: Dont probe devices after bus_type.match() probe deferral Date: Tue, 13 Sep 2022 16:06:19 +0200 Message-Id: <20220913140348.910218279@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220913140348.835121645@linuxfoundation.org> References: <20220913140348.835121645@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Isaac J. Manjarres commit 25e9fbf0fd38868a429feabc38abebfc6dbf6542 upstream. Both __device_attach_driver() and __driver_attach() check the return code of the bus_type.match() function to see if the device needs to be added to the deferred probe list. After adding the device to the list, the logic attempts to bind the device to the driver anyway, as if the device had matched with the driver, which is not correct. If __device_attach_driver() detects that the device in question is not ready to match with a driver on the bus, then it doesn't make sense for the device to attempt to bind with the current driver or continue attempting to match with any of the other drivers on the bus. So, update the logic in __device_attach_driver() to reflect this. If __driver_attach() detects that a driver tried to match with a device that is not ready to match yet, then the driver should not attempt to bind with the device. However, the driver can still attempt to match and bind with other devices on the bus, as drivers can be bound to multiple devices. So, update the logic in __driver_attach() to reflect this. Fixes: 656b8035b0ee ("ARM: 8524/1: driver cohandle -EPROBE_DEFER from bus_t= ype.match()") Cc: stable@vger.kernel.org Cc: Saravana Kannan Reported-by: Guenter Roeck Tested-by: Guenter Roeck Tested-by: Linus Walleij Reviewed-by: Saravana Kannan Signed-off-by: Isaac J. Manjarres Link: https://lore.kernel.org/r/20220817184026.3468620-1-isaacmanjarres@goo= gle.com Signed-off-by: Greg Kroah-Hartman --- drivers/base/dd.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -738,6 +738,11 @@ static int __device_attach_driver(struct } else if (ret =3D=3D -EPROBE_DEFER) { dev_dbg(dev, "Device match requests probe deferral\n"); driver_deferred_probe_add(dev); + /* + * Device can't match with a driver right now, so don't attempt + * to match or bind with other drivers on the bus. + */ + return ret; } else if (ret < 0) { dev_dbg(dev, "Bus failed to match device: %d", ret); return ret; @@ -891,6 +896,11 @@ static int __driver_attach(struct device } else if (ret =3D=3D -EPROBE_DEFER) { dev_dbg(dev, "Device match requests probe deferral\n"); driver_deferred_probe_add(dev); + /* + * Driver could not match with device, but may match with + * another device on the bus. + */ + return 0; } else if (ret < 0) { dev_dbg(dev, "Bus failed to match device: %d", ret); return ret;