linux-kernel - [PATCH 4.4 019/100] usb: gadget: composite: Inform controller driver of self-powered

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: <20200422095026.366862018@linuxfoundation.org>
Date:   Wed, 22 Apr 2020 11:55:49 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Thinh Nguyen <thinhn@...opsys.com>,
        Felipe Balbi <balbi@...nel.org>
Subject: [PATCH 4.4 019/100] usb: gadget: composite: Inform controller driver of self-powered

From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>

commit 5e5caf4fa8d3039140b4548b6ab23dd17fce9b2c upstream.

Different configuration/condition may draw different power. Inform the
controller driver of the change so it can respond properly (e.g.
GET_STATUS request). This fixes an issue with setting MaxPower from
configfs. The composite driver doesn't check this value when setting
self-powered.

Cc: stable@...r.kernel.org
Fixes: 88af8bbe4ef7 ("usb: gadget: the start of the configfs interface")
Signed-off-by: Thinh Nguyen <thinhn@...opsys.com>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/composite.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -744,6 +744,11 @@ static int set_config(struct usb_composi
 	/* when we return, be sure our power usage is valid */
 	power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW;
 done:
+	if (power <= USB_SELF_POWER_VBUS_MAX_DRAW)
+		usb_gadget_set_selfpowered(gadget);
+	else
+		usb_gadget_clear_selfpowered(gadget);
+
 	usb_gadget_vbus_draw(gadget, power);
 	if (result >= 0 && cdev->delayed_status)
 		result = USB_GADGET_DELAYED_STATUS;
@@ -2156,6 +2161,7 @@ void composite_suspend(struct usb_gadget
 
 	cdev->suspended = 1;
 
+	usb_gadget_set_selfpowered(gadget);
 	usb_gadget_vbus_draw(gadget, 2);
 }
 
@@ -2179,6 +2185,9 @@ void composite_resume(struct usb_gadget
 
 		maxpower = cdev->config->MaxPower;
 
+		if (maxpower > USB_SELF_POWER_VBUS_MAX_DRAW)
+			usb_gadget_clear_selfpowered(gadget);
+
 		usb_gadget_vbus_draw(gadget, maxpower ?
 			maxpower : CONFIG_USB_GADGET_VBUS_DRAW);
 	}