linux-kernel - [PATCH] USB: serial: mos7720: fix parallel-port state restore

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Message-Id: <20201104164727.26351-1-johan@kernel.org>
Date:   Wed,  4 Nov 2020 17:47:27 +0100
From:   Johan Hovold <johan@...nel.org>
To:     linux-usb@...r.kernel.org
Cc:     Davidlohr Bueso <dave@...olabs.net>, linux-kernel@...r.kernel.org,
        Johan Hovold <johan@...nel.org>,
        stable <stable@...r.kernel.org>
Subject: [PATCH] USB: serial: mos7720: fix parallel-port state restore

The parallel-port restore operations is called when a driver claims the
port and is supposed to restore the provided state (e.g. saved when
releasing the port).

Fixes: b69578df7e98 ("USB: usbserial: mos7720: add support for parallel port on moschip 7715")
Cc: stable <stable@...r.kernel.org>     # 2.6.35
Signed-off-by: Johan Hovold <johan@...nel.org>
---
 drivers/usb/serial/mos7720.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index 5eed1078fac8..5a5d2a95070e 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -639,6 +639,8 @@ static void parport_mos7715_restore_state(struct parport *pp,
 		spin_unlock(&release_lock);
 		return;
 	}
+	mos_parport->shadowDCR = s->u.pc.ctr;
+	mos_parport->shadowECR = s->u.pc.ecr;
 	write_parport_reg_nonblock(mos_parport, MOS7720_DCR,
 				   mos_parport->shadowDCR);
 	write_parport_reg_nonblock(mos_parport, MOS7720_ECR,
-- 
2.26.2