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 E43981C06 for ; Wed, 27 Mar 2024 15:08:08 +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=1711552089; cv=none; b=tAPPHvlnPTwr/34v/oZtwRKQg4P1O8PC00tLPWWXLarE09wDVRu2/YkrcICLlPTdmDemvwxu7d8qNKs8d7OdgaCCkhdyCnFYthCKJjIFiu/8f4jTGQ5OQ6wy+bFJ/dFmMkoTvm7/5vCeDjTcAvncwOoa3YBTIE2tFeMnlw+CUB0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711552089; c=relaxed/simple; bh=QrywI9ILh93mZx4Wwri4xTF774Zl2lw0wMS4zHwVOfk=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=f5tWUZSRbfXjPDWZmjclGH6FVJ00N1goPwUzT2Vt7mto0NKKDX2IU6oAomd/ZUzZ2ASU7K7LvwgRmxbYfXMtheOoNbwc9eoHBaEOkZxtnFCNYLaKO/T0Muo0Qu3LRqWx0KisxE0SlgsIL4S+O1pkx7iKkPDAEcBj/SXzh1wtiic= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jghMGVvw; 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="jghMGVvw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63DCCC433C7; Wed, 27 Mar 2024 15:08:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1711552088; bh=QrywI9ILh93mZx4Wwri4xTF774Zl2lw0wMS4zHwVOfk=; h=Subject:To:Cc:From:Date:From; b=jghMGVvworGPDIIkEjHHysS4Nc3G8CzKnGcU8EFkMvjxbRYkmvNjOgmLugLj/fePn RrcSzKnzeXSSmzOGJGSKKH9FUHzyUVabWHjAFz99JQ9EvBrKVwiHkYPQMcPPIXW2EU 3ReOcw/ZtodLy3y9Zn9i0Va442PqGNzCa2jN9Chg= Subject: FAILED: patch "[PATCH] usb: typec: altmodes/displayport: create sysfs nodes as" failed to apply to 5.15-stable tree To: rdbabiera@google.com,gregkh@linuxfoundation.org Cc: From: Date: Wed, 27 Mar 2024 16:07:59 +0100 Message-ID: <2024032759-written-hypnotize-0b2f@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 165376f6b23e9a779850e750fb2eb06622e5a531 # git commit -s git send-email --to '' --in-reply-to '2024032759-written-hypnotize-0b2f@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^.. Possible dependencies: 165376f6b23e ("usb: typec: altmodes/displayport: create sysfs nodes as driver's default device attribute group") 001b0c780eac ("usb: typec: altmodes/displayport: Add hpd sysfs attribute") 7f8113948785 ("usb: typec: altmodes/displayport: Notify drm subsys of hotplug events") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 165376f6b23e9a779850e750fb2eb06622e5a531 Mon Sep 17 00:00:00 2001 From: RD Babiera Date: Thu, 29 Feb 2024 00:11:02 +0000 Subject: [PATCH] usb: typec: altmodes/displayport: create sysfs nodes as driver's default device attribute group The DisplayPort driver's sysfs nodes may be present to the userspace before typec_altmode_set_drvdata() completes in dp_altmode_probe. This means that a sysfs read can trigger a NULL pointer error by deferencing dp->hpd in hpd_show or dp->lock in pin_assignment_show, as dev_get_drvdata() returns NULL in those cases. Remove manual sysfs node creation in favor of adding attribute group as default for devices bound to the driver. The ATTRIBUTE_GROUPS() macro is not used here otherwise the path to the sysfs nodes is no longer compliant with the ABI. Fixes: 0e3bb7d6894d ("usb: typec: Add driver for DisplayPort alternate mode") Cc: stable@vger.kernel.org Signed-off-by: RD Babiera Link: https://lore.kernel.org/r/20240229001101.3889432-2-rdbabiera@google.com Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c index f81bec0c7b86..f8ea3054be54 100644 --- a/drivers/usb/typec/altmodes/displayport.c +++ b/drivers/usb/typec/altmodes/displayport.c @@ -559,16 +559,21 @@ static ssize_t hpd_show(struct device *dev, struct device_attribute *attr, char } static DEVICE_ATTR_RO(hpd); -static struct attribute *dp_altmode_attrs[] = { +static struct attribute *displayport_attrs[] = { &dev_attr_configuration.attr, &dev_attr_pin_assignment.attr, &dev_attr_hpd.attr, NULL }; -static const struct attribute_group dp_altmode_group = { +static const struct attribute_group displayport_group = { .name = "displayport", - .attrs = dp_altmode_attrs, + .attrs = displayport_attrs, +}; + +static const struct attribute_group *displayport_groups[] = { + &displayport_group, + NULL, }; int dp_altmode_probe(struct typec_altmode *alt) @@ -576,7 +581,6 @@ int dp_altmode_probe(struct typec_altmode *alt) const struct typec_altmode *port = typec_altmode_get_partner(alt); struct fwnode_handle *fwnode; struct dp_altmode *dp; - int ret; /* FIXME: Port can only be DFP_U. */ @@ -587,10 +591,6 @@ int dp_altmode_probe(struct typec_altmode *alt) DP_CAP_PIN_ASSIGN_DFP_D(alt->vdo))) return -ENODEV; - ret = sysfs_create_group(&alt->dev.kobj, &dp_altmode_group); - if (ret) - return ret; - dp = devm_kzalloc(&alt->dev, sizeof(*dp), GFP_KERNEL); if (!dp) return -ENOMEM; @@ -624,7 +624,6 @@ void dp_altmode_remove(struct typec_altmode *alt) { struct dp_altmode *dp = typec_altmode_get_drvdata(alt); - sysfs_remove_group(&alt->dev.kobj, &dp_altmode_group); cancel_work_sync(&dp->work); if (dp->connector_fwnode) { @@ -649,6 +648,7 @@ static struct typec_altmode_driver dp_altmode_driver = { .driver = { .name = "typec_displayport", .owner = THIS_MODULE, + .dev_groups = displayport_groups, }, }; module_typec_altmode_driver(dp_altmode_driver);