linux-kernel - [PATCH 5.9 366/757] usb: gadget: u_serial: clear suspended flag when disconnecting

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Date:   Tue, 27 Oct 2020 14:50:16 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Linh Phung <linh.phung.jy@...esas.com>,
        Tam Nguyen <tam.nguyen.xa@...esas.com>,
        Felipe Balbi <balbi@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.9 366/757] usb: gadget: u_serial: clear suspended flag when disconnecting

From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>

[ Upstream commit d98ef43bfb65b5201e1afe36aaf8c4f9d71b4307 ]

The commit aba3a8d01d62 ("usb: gadget: u_serial: add suspend resume
callbacks") set/cleared the suspended flag in USB bus suspend/resume
only. But, when a USB cable is disconnected in the suspend, since some
controllers will not detect USB bus resume, the suspended flag is not
cleared. After that, user cannot send any data. To fix the issue,
clears the suspended flag in the gserial_disconnect().

Fixes: aba3a8d01d62 ("usb: gadget: u_serial: add suspend resume callbacks")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Tested-by: Linh Phung <linh.phung.jy@...esas.com>
Tested-by: Tam Nguyen <tam.nguyen.xa@...esas.com>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/gadget/function/u_serial.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index 127ecc2b43176..2caccbb6e0140 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -1391,6 +1391,7 @@ void gserial_disconnect(struct gserial *gser)
 		if (port->port.tty)
 			tty_hangup(port->port.tty);
 	}
+	port->suspended = false;
 	spin_unlock_irqrestore(&port->port_lock, flags);
 
 	/* disable endpoints, aborting down any active I/O */
-- 
2.25.1