From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [regression, bisected] Keyboard not responding after resuming from suspend/hibernate Date: Sun, 2 Dec 2018 23:28:09 +0100 Message-ID: <20181202222809.GA29467@amd> References: <20180831215121.1b1f66bf@korsan.localdomain> <20181019102031.77015d44@korsan.localdomain> <20181025074903.GA9323@amd> <20181028220654.7e77e5d7@ubuntu> <20181130154455.21578c4d@korsan.localdomain> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="lrZ03NoBR/3+SXJZ" Return-path: Content-Disposition: inline In-Reply-To: <20181130154455.21578c4d@korsan.localdomain> Sender: linux-kernel-owner@vger.kernel.org To: Numan =?utf-8?B?RGVtaXJkw7bEn2Vu?= Cc: jason.low2@hpe.com, Waiman.Long@hpe.com, paulmck@linux.vnet.ibm.com, tglx@linutronix.de, dmitry.torokhov@gmail.com, peterz@infradead.org, mingo@redhat.com, linux-kernel@vger.kernel.org, linux-input@vger.kernel.org List-Id: linux-input@vger.kernel.org --lrZ03NoBR/3+SXJZ Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri 2018-11-30 15:44:55, Numan Demird=C3=B6=C4=9Fen wrote: > Sun, 28 Oct 2018 22:06:54 +0300 tarihinde > Numan Demird=C3=B6=C4=9Fen yazd=C4=B1: >=20 > >Thu, 25 Oct 2018 09:49:03 +0200 tarihinde > >Pavel Machek yazd=C4=B1: > > > >> Hi! > >>=20 > >> Here's problem bisected down to: > >>=20 > >> commit 9d659ae14b545c4296e812c70493bfdc999b5c1c > >> Author: Peter Zijlstra > >> Date: Tue Aug 23 14:40:16 2016 +0200 > >>=20 > >> locking/mutex: Add lock handoff to avoid starvation > >>=20 > >> Implement lock handoff to avoid lock starvation. > >>=20 > >> Numan, I assume revert of that patch on the 4.18 kernel still makes > >> it work? > >> =20 > > > >Unfortunately, I could not revert > >9d659ae14b545c4296e812c70493bfdc999b5c1c on kernels from 4.18.16 to > >4.10-rc1 because there were too much conflicts, which I could not solve > >as an "average Joe". I tried a3ea3d9b865c2a8f7fe455c7fa26db4b6fd066e3 > >which is parent of 9d659ae14b545c4296e812c70493bfdc999b5c1c and > >succeeded to compile kernel. > > > >git checkout a3ea3d9b865c2a8f7fe455c7fa26db4b6fd066e3 > > > >Then, I compiled kernel and rebooted with it. I tried a couples of > >times suspending and resuming, all of the time keyboard worked as > >expected. > > >=20 > With this one line patch from Takashi Iwai, keyboard is working as > expected after resuming from suspend/hibernate. >=20 > --- a/kernel/locking/mutex.c > +++ b/kernel/locking/mutex.c > @@ -59,7 +59,7 @@ EXPORT_SYMBOL(__mutex_init); > * Bit2 indicates handoff has been done and we're waiting for pickup. > */ > #define MUTEX_FLAG_WAITERS 0x01 > -#define MUTEX_FLAG_HANDOFF 0x02 > +#define MUTEX_FLAG_HANDOFF 0x00 > #define MUTEX_FLAG_PICKUP 0x04 > =20 > #define MUTEX_FLAGS 0x07 >=20 >=20 > Thanks in advance and regards, Ok. So it is a regression, and you can ask Linus to apply this =2E. but... that's kind of heavy solution. Peter, do you have any other ideas? Pavel --=20 (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo= g.html --lrZ03NoBR/3+SXJZ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlwEXHkACgkQMOfwapXb+vKglQCaA7lxCzLnOVLGE4OKpnuR4mBr tkcAnA2BnEslbP+BkCLCtbbImMzF0oSG =MvNv -----END PGP SIGNATURE----- --lrZ03NoBR/3+SXJZ--