From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756461AbcJWKc2 (ORCPT ); Sun, 23 Oct 2016 06:32:28 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:35184 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754225AbcJWKcY (ORCPT ); Sun, 23 Oct 2016 06:32:24 -0400 From: Pali =?utf-8?q?Roh=C3=A1r?= To: Pavel Machek Subject: Re: v4.9-rc1: smiapp divides by zero Date: Sun, 23 Oct 2016 12:32:20 +0200 User-Agent: KMail/1.13.7 (Linux/3.13.0-100-generic; KDE/4.14.2; x86_64; ; ) Cc: Ivaylo Dimitrov , sakari.ailus@iki.fi, sre@kernel.org, linux-media@vger.kernel.org, galak@codeaurora.org, mchehab@osg.samsung.com, linux-kernel@vger.kernel.org References: <1465659593-16858-1-git-send-email-ivo.g.dimitrov.75@gmail.com> <20161023073322.GA3523@amd> <20161023102213.GA13705@amd> In-Reply-To: <20161023102213.GA13705@amd> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart6429053.YPL4hkA8Wf"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <201610231232.20750@pali> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --nextPart6429053.YPL4hkA8Wf Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Sunday 23 October 2016 12:22:13 Pavel Machek wrote: > Hi! >=20 > I tried to update camera code on n900 to v4.9-rc1, and I'm getting > some divide by zero, that eventually cascades into fcam-dev not > working. >=20 > mul is zero in my testing, resulting in divide by zero. >=20 > (Note that this is going from my patched camera-v4.8 tree to > camera-v4.9 tree.) >=20 > Best regards, > Pavel Hi! Ideally look at existing camera patches. I do not know which one is last, but here are some links: https://github.com/freemangordon/linux-n900/tree/v4.6-rc4-n900-camera https://github.com/freemangordon/linux-n900/tree/camera https://git.kernel.org/cgit/linux/kernel/git/sre/linux-n900.git/log/?h=3Dn9= 00-camera-ivo https://git.kernel.org/cgit/linux/kernel/git/sre/linux-n900.git/log/?h=3Dn9= 00-camera > diff --git a/drivers/media/i2c/smiapp-pll.c > b/drivers/media/i2c/smiapp-pll.c index 5ad1edb..e0a6edd 100644 > --- a/drivers/media/i2c/smiapp-pll.c > +++ b/drivers/media/i2c/smiapp-pll.c > @@ -16,6 +16,8 @@ > * General Public License for more details. > */ >=20 > +#define DEBUG > + > #include > #include > #include > @@ -457,6 +459,10 @@ int smiapp_pll_calculate(struct device *dev, > i =3D gcd(pll->pll_op_clk_freq_hz, pll->ext_clk_freq_hz); > mul =3D div_u64(pll->pll_op_clk_freq_hz, i); > div =3D pll->ext_clk_freq_hz / i; > + if (!mul) { > + dev_err(dev, "forcing mul to 1\n"); > + mul =3D 1; > + } > dev_dbg(dev, "mul %u / div %u\n", mul, div); >=20 > min_pre_pll_clk_div =3D Is not this patch still enough? https://patchwork.kernel.org/patch/8921761/ =2D-=20 Pali Roh=C3=A1r pali.rohar@gmail.com --nextPart6429053.YPL4hkA8Wf Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlgMkbQACgkQi/DJPQPkQ1IyIACfQ1CTllrsWMoSjdRo+PK+YA4i yDYAnRMgBc83lA92iYREs+Znzq9aMrhR =Watm -----END PGP SIGNATURE----- --nextPart6429053.YPL4hkA8Wf--