linux-kernel - [PATCH v2 1/1] driver core: Keep the supplier fwnode consistent with the device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20231113133044.55257-1-herve.codina@bootlin.com>
Date:   Mon, 13 Nov 2023 14:30:44 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Saravana Kannan <saravanak@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Steen Hegelund <steen.hegelund@...rochip.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Herve Codina <herve.codina@...tlin.com>, stable@...r.kernel.org
Subject: [PATCH v2 1/1] driver core: Keep the supplier fwnode consistent with the device

The commit 3a2dbc510c43 ("driver core: fw_devlink: Don't purge child
fwnode's consumer links") introduces the possibility to use the
supplier's parent device instead of the supplier itself.
In that case the supplier fwnode used is not updated and is no more
consistent with the supplier device used.

Update the fwnode used to be consistent with the supplier device used.

Fixes: 3a2dbc510c43 ("driver core: fw_devlink: Don't purge child fwnode's consumer links")
Cc: stable@...r.kernel.org
Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
Changes v1 -> v2:
  Remove sup_handle check and related pr_debug() call as sup_handle cannot be
  invalid if sup_dev is valid.

 drivers/base/core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 4d8b315c48a1..2f6a21b908ec 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2076,6 +2076,13 @@ static int fw_devlink_create_devlink(struct device *con,
 		sup_dev = get_dev_from_fwnode(sup_handle);
 
 	if (sup_dev) {
+		/*
+		 * The supplier device may have changed and so, the supplier
+		 * fwnode maybe inconsistent.
+		 * Update the supplier fwnode
+		 */
+		sup_handle = sup_dev->fwnode;
+
 		/*
 		 * If it's one of those drivers that don't actually bind to
 		 * their device using driver core, then don't wait on this
-- 
2.41.0