From: Chunfeng Yun <chunfeng.yun@mediatek.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Chunfeng Yun <chunfeng.yun@mediatek.com>,
<linux-usb@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-mediatek@lists.infradead.org>
Subject: [PATCH 1/2] usb: gadget: composite: fix delayed_status race condition when set_interface
Date: Fri, 22 Jun 2018 14:33:05 +0800 [thread overview]
Message-ID: <4c338a129ab14ab41949da5e3c21aed0d77dff8d.1529647619.git.chunfeng.yun@mediatek.com> (raw)
It happens when enable debug log, if set_alt() returns
USB_GADGET_DELAYED_STATUS and usb_composite_setup_continue()
is called before increasing count of @delayed_status,
so fix it by using spinlock of @cdev->lock.
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Tested-by: Jay Hsu <shih-chieh.hsu@mediatek.com>
---
drivers/usb/gadget/composite.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index f242c2b..d2fa071 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1719,6 +1719,8 @@ static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
*/
if (w_value && !f->get_alt)
break;
+
+ spin_lock(&cdev->lock);
value = f->set_alt(f, w_index, w_value);
if (value == USB_GADGET_DELAYED_STATUS) {
DBG(cdev,
@@ -1728,6 +1730,7 @@ static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
DBG(cdev, "delayed_status count %d\n",
cdev->delayed_status);
}
+ spin_unlock(&cdev->lock);
break;
case USB_REQ_GET_INTERFACE:
if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE))
--
1.9.1
next reply other threads:[~2018-06-22 6:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-22 6:33 Chunfeng Yun [this message]
2018-06-22 6:33 ` [PATCH 2/2] usb: core: phy: fix return value checking about devm_of_phy_get_by_index() Chunfeng Yun
2018-06-24 18:00 ` Martin Blumenstingl
2018-06-25 5:29 ` Johan Hovold
2018-06-25 6:37 ` Chunfeng Yun
2018-06-25 17:32 ` Martin Blumenstingl
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