linux-kernel - [PATCH 02/10] mei: vsc: Don't re-init VSC from mei_vsc_hw

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

Message-ID: <20250623085052.12347-3-hansg@kernel.org>
Date: Mon, 23 Jun 2025 10:50:44 +0200
From: Hans de Goede <hansg@...nel.org>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>,
	Alexander Usyskin <alexander.usyskin@...el.com>
Cc: Hans de Goede <hansg@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 02/10] mei: vsc: Don't re-init VSC from mei_vsc_hw_reset() on stop

mei_vsc_hw_reset() gets called from mei_start() and mei_stop() in
the latter case we do not need to re-init the VSC by calling vsc_tp_init().

mei_stop() only happens on shutdown and driver unbind. On shutdown we
don't need to load + boot the firmware and if the driver later is
bound to the device again then mei_start() will do another reset.

The intr_enable flag is true when called from mei_start() and false on
mei_stop(). Skip vsc_tp_init() when intr_enable is false.

This avoids unnecessarily uploading the firmware, which takes 11 seconds.
This change reduces the poweroff/reboot time by 11 seconds.

Fixes: 386a766c4169 ("mei: Add MEI hardware support for IVSC device")
Signed-off-by: Hans de Goede <hansg@...nel.org>
---
 drivers/misc/mei/platform-vsc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/mei/platform-vsc.c b/drivers/misc/mei/platform-vsc.c
index 435760b1e86f..1ac85f0251c5 100644
--- a/drivers/misc/mei/platform-vsc.c
+++ b/drivers/misc/mei/platform-vsc.c
@@ -256,6 +256,9 @@ static int mei_vsc_hw_reset(struct mei_device *mei_dev, bool intr_enable)

 	vsc_tp_reset(hw->tp);

+	if (!intr_enable)
+		return 0;
+
 	return vsc_tp_init(hw->tp, mei_dev->dev);
 }

-- 
2.49.0