linux-kernel - [PATCH v3 12/36] usb: gadget: composite: disable eps before calling disable() callback

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: <1449833115-24065-13-git-send-email-r.baldyga@samsung.com>
Date:	Fri, 11 Dec 2015 12:24:51 +0100
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, andrzej.p@...sung.com,
	m.szyprowski@...sung.com, b.zolnierkie@...sung.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH v3 12/36] usb: gadget: composite: disable eps before calling
 disable() callback

Changes meaning of disable() operation for functions using new API.
Before calling disable() callback composite automatically disables
endpoints of active altsettings of given USB function. This reduces
amount of boilerplate code in USB functions.

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
 drivers/usb/gadget/composite.c | 51 ++++++++++++++++++++++++++++++++++++------
 1 file changed, 44 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index fdd0cbe..3695b75 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -246,12 +246,12 @@ done:
 }
 EXPORT_SYMBOL_GPL(usb_add_function);
 
+static void disable_function(struct usb_function *f);
+
 void usb_remove_function(struct usb_configuration *c, struct usb_function *f)
 {
-	if (f->disable)
-		f->disable(f);
+	disable_function(f);
 
-	bitmap_zero(f->endpoints, 32);
 	list_del(&f->list);
 	if (f->unbind)
 		f->unbind(c, f);
@@ -946,6 +946,46 @@ static void device_qual(struct usb_composite_dev *cdev)
 
 /*-------------------------------------------------------------------------*/
 
+/**
+ * disable_interface - disable all endpoints in given interface
+ * @f: USB function
+ * @i: interface index in function
+ */
+static void disable_interface(struct usb_function *f, unsigned i)
+{
+	struct usb_composite_intf *intf;
+	struct usb_composite_altset *alt;
+	int e;
+
+	intf = f->descs->intfs[i];
+	if (intf->cur_altset < 0)
+		return;
+
+	alt = intf->altsets[intf->cur_altset];
+	for (e = 0; e < alt->eps_num; ++e)
+		usb_ep_disable(alt->eps[e]->ep);
+
+	intf->cur_altset = -1;
+}
+
+/**
+ * disable_function - disable all endpoints in given function
+ * @f: USB function
+ */
+static void disable_function(struct usb_function *f)
+{
+	int i;
+
+	if (usb_function_is_new_api(f))
+		for (i = 0; i < f->descs->intfs_num; ++i)
+			disable_interface(f, i);
+
+	if (f->disable)
+		f->disable(f);
+
+	bitmap_zero(f->endpoints, 32);
+}
+
 static void reset_config(struct usb_composite_dev *cdev)
 {
 	struct usb_function		*f;
@@ -953,10 +993,7 @@ static void reset_config(struct usb_composite_dev *cdev)
 	DBG(cdev, "reset config\n");
 
 	list_for_each_entry(f, &cdev->config->functions, list) {
-		if (f->disable)
-			f->disable(f);
-
-		bitmap_zero(f->endpoints, 32);
+		disable_function(f);
 	}
 	cdev->config = NULL;
 	cdev->delayed_status = 0;
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/