From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felipe Balbi Subject: Re: [PATCH] usb: dwc3: gadget: Fail request submission if it was already queued Date: Fri, 11 Jan 2019 09:43:41 +0200 Message-ID: <87pnt3od02.fsf@linux.intel.com> References: <20190111060212.7390-1-mgautam@codeaurora.org> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" Return-path: In-Reply-To: <20190111060212.7390-1-mgautam@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org Cc: linux-arm-msm@vger.kernel.org, Manu Gautam , Greg Kroah-Hartman , "open list:DESIGNWARE USB3 DRD IP DRIVER" , open list List-Id: linux-arm-msm@vger.kernel.org --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Hi, Manu Gautam writes: > If a function driver tries to re-submit an already queued request, > it can results in corruption of pending/started request lists. > Catch such conditions and fail the request submission to DCD. > > Signed-off-by: Manu Gautam > --- > drivers/usb/dwc3/gadget.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c > index 679c12e14522..51716c6b286a 100644 > --- a/drivers/usb/dwc3/gadget.c > +++ b/drivers/usb/dwc3/gadget.c > @@ -1290,6 +1290,12 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *= dep, struct dwc3_request *req) > &req->request, req->dep->name)) > return -EINVAL; >=20=20 > + if (req->request.status =3D=3D -EINPROGRESS) { this test is really not enough. What if gadget driver set status to EINPROGRESS before submission? A better check would involve making sure req isn't part of dep->pending_list or dep->started_list or dep->cancelled_list. It's clear that this won't work very well as the amount of requests grow. Anyway, which gadget driver did this? Why is it only affecting dwc3? =2D-=20 balbi --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEElLzh7wn96CXwjh2IzL64meEamQYFAlw4SS0ACgkQzL64meEa mQa3hA//bnVIRjIdt9cCTa1TdxjxLIm7gWgUTTKIBCAHaV+rBsldkCu20tECdlxL /BURIZonF7CS4WgGj6hth2ZoPwP9KzMorvo5FG824mLPVJ6AkOssZOVD+HjezLyB q+ixy90CIiZgYBtKObY6zTo7IxiuwIKL/E/sDzxn75bosJa6JBdkDtgi5oeirynF 5Xse1ODym+/CzxXABOMmOGTS+ymyhhSBHLdhVuafua8SUKNxrL7xnhrX6kEQ+DjD Unu2Ws1QrK+gp0HzEtzaIyfrFKk20rfFw5trwhTfjjws2W+xCFFWX90qjbFd3aQt 0+HEW34N+NBBThRVN4yT8tSnRmp1FS3x8OPOpWPIa5gwJCCzhGwEs/D7BB1fuab9 yk9XYhgDC/u3heDK/C8McPF0V74kSLZAnL2ZYgNXEbBlHKTNrLZebIVIygVAWs/F GqPuL/lupJ54totYQvbIs+5a0s4QBW9EXaLa5YY0Kjqc3fZ/vYMfcHYZTO2Gzk9n p0vW9z54mCmPWvGOukx8HTFSHq3P4agXvwHJ7n6vxwx/J2FzED3YRmxYHTEtLjf6 6dqmDoA2BC52Z1bj7Q3Vf/qd15j5eltjm2WKHrkSroYHqH+ht7cxh1olMJ+bL+cm VbXHxz41nX1fww4WYI4enUEbS0sys0BMV8RQQ3lzNXPwA0bCs8c= =+Cqs -----END PGP SIGNATURE----- --=-=-=--