From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 6 Sep 2021 09:42:21 +0000 (+0300)
Subject: usb: gadget: r8a66597: fix a loop in set_feature()
X-Git-Tag: v4.4.286~41
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4ba5165b50ab692683c1b2caf00e0e35ab71f6df;p=thirdparty%2Fkernel%2Fstable.git

usb: gadget: r8a66597: fix a loop in set_feature()

commit 17956b53ebff6a490baf580a836cbd3eae94892b upstream.

This loop is supposed to loop until if reads something other than
CS_IDST or until it times out after 30,000 attempts.  But because of
the || vs && bug, it will never time out and instead it will loop a
minimum of 30,000 times.

This bug is quite old but the code is only used in USB_DEVICE_TEST_MODE
so it probably doesn't affect regular usage.

Fixes: 96fe53ef5498 ("usb: gadget: r8a66597-udc: add support for TEST_MODE")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210906094221.GA10957@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/gadget/udc/r8a66597-udc.c b/drivers/usb/gadget/udc/r8a66597-udc.c
index 4eb8e181763d1..ffe6cb4c78ffb 100644
--- a/drivers/usb/gadget/udc/r8a66597-udc.c
+++ b/drivers/usb/gadget/udc/r8a66597-udc.c
@@ -1253,7 +1253,7 @@ static void set_feature(struct r8a66597 *r8a66597, struct usb_ctrlrequest *ctrl)
 			do {
 				tmp = r8a66597_read(r8a66597, INTSTS0) & CTSQ;
 				udelay(1);
-			} while (tmp != CS_IDST || timeout-- > 0);
+			} while (tmp != CS_IDST && timeout-- > 0);
 
 			if (tmp == CS_IDST)
 				r8a66597_bset(r8a66597,