From patchwork Thu Sep 8 17:46:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar Mahadev Lad X-Patchwork-Id: 604132 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 994FEC38145 for ; Thu, 8 Sep 2022 17:47:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231344AbiIHRrE (ORCPT ); Thu, 8 Sep 2022 13:47:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231749AbiIHRqr (ORCPT ); Thu, 8 Sep 2022 13:46:47 -0400 Received: from relmlie5.idc.renesas.com (relmlor1.renesas.com [210.160.252.171]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 061BE63E2; Thu, 8 Sep 2022 10:46:44 -0700 (PDT) X-IronPort-AV: E=Sophos;i="5.93,300,1654527600"; d="scan'208";a="132135180" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 09 Sep 2022 02:46:43 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 3B68C400C9E6; Fri, 9 Sep 2022 02:46:39 +0900 (JST) From: Lad Prabhakar To: "Rafael J. Wysocki" , Daniel Lezcano , Amit Kucheria , Zhang Rui , linux-pm@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [PATCH] thermal/core: Add a check before calling set_trip_temp() Date: Thu, 8 Sep 2022 18:46:10 +0100 Message-Id: <20220908174610.7837-1-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org The thermal driver [0] for Renesas RZ/G2L SoC does not implement set_trip_temp() callback but has trips commit 9326167058e8 ("thermal/core: Move set_trip_temp ops to the sysfs code") changed the behaviour which causes the below panic when trying to set the trip temperature: root@smarc-rzg2l:~# echo 51000 > /sys/class/thermal/thermal_zone0/trip_point_0_temp [ 92.461521] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 92.470958] Mem abort info: [ 92.474311] ESR = 0x0000000086000004 [ 92.478546] EC = 0x21: IABT (current EL), IL = 32 bits [ 92.484290] SET = 0, FnV = 0 [ 92.487693] EA = 0, S1PTW = 0 [ 92.491153] FSC = 0x04: level 0 translation fault [ 92.496461] user pgtable: 4k pages, 48-bit VAs, pgdp=000000004e885000 [ 92.503736] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 [ 92.510869] Internal error: Oops: 86000004 [#3] PREEMPT SMP [ 92.516556] CPU: 0 PID: 290 Comm: sh Tainted: G D 6.0.0-rc4-next-20220906-arm64-renesas-00124-g84633c87c5f6-dirty #509 [ 92.528814] Hardware name: Renesas SMARC EVK based on r9a07g044l2 (DT) [ 92.535441] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 92.542516] pc : 0x0 [ 92.544764] lr : trip_point_temp_store+0x84/0x140 [ 92.549582] sp : ffff80000a92bc10 [ 92.552961] x29: ffff80000a92bc10 x28: ffff00000d8a45c0 x27: 0000000000000000 [ 92.560249] x26: 0000000000000000 x25: ffff8000082b53e8 x24: ffff00000eaffc20 [ 92.567532] x23: ffff80000a92bd68 x22: ffff00000d3e0f80 x21: 0000000000000006 [ 92.574814] x20: ffff800009149000 x19: ffff00000b8ab000 x18: 0000000000000000 [ 92.582097] x17: 0000000000000000 x16: 0000000000000000 x15: 0000aaab028cdee0 [ 92.589378] x14: 0000000000000000 x13: 0000000000000000 x12: ffff80000a92bbd0 [ 92.596659] x11: ffff00000d3e0f80 x10: ffff800009149eb8 x9 : 000000000000000a [ 92.603940] x8 : 00000000ffffffc9 x7 : 0000000000000005 x6 : 000000000000002a [ 92.611220] x5 : 000000000000c738 x4 : 00000000ffffffd3 x3 : 0000000000000000 [ 92.618500] x2 : 000000000000c738 x1 : 0000000000000000 x0 : ffff00000b8ab000 [ 92.625781] Call trace: [ 92.628282] 0x0 [ 92.630176] dev_attr_store+0x14/0x28 [ 92.633935] sysfs_kf_write+0x4c/0x70 [ 92.637681] kernfs_fop_write_iter+0x160/0x1e0 [ 92.642213] vfs_write+0x474/0x540 [ 92.645703] ksys_write+0x68/0xf8 [ 92.649100] __arm64_sys_write+0x18/0x20 [ 92.653111] invoke_syscall+0x40/0xf8 [ 92.656866] el0_svc_common.constprop.3+0x88/0x110 [ 92.661758] do_el0_svc+0x20/0x78 [ 92.665158] el0_svc+0x3c/0x90 [ 92.668291] el0t_64_sync_handler+0x90/0xb8 [ 92.672563] el0t_64_sync+0x148/0x14c [ 92.676322] Code: bad PC value [ 92.679453] ---[ end trace 0000000000000000 ]--- /bin/start_getty: line 40: 290 Segmentation fault ${setsid:-} ${getty} -L $1 $2 $3 Poky (Yocto Project Reference Distro) 3.2.1 smarc-rzg2l ttySC0 smarc-rzg2l login: This patch fixes the above issue by adding a check to see if set_trip_temp() callback is implemented before calling it. [0] drivers/thermal/rzg2l_thermal.c Fixes: 9326167058e8 ("thermal/core: Move set_trip_temp ops to the sysfs code") Signed-off-by: Lad Prabhakar --- Note: Patch applies on top of [0]. [0] https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git/log/?h=thermal/linux-next --- drivers/thermal/thermal_sysfs.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/thermal/thermal_sysfs.c b/drivers/thermal/thermal_sysfs.c index 78c5841bdfae..ec495c7dff03 100644 --- a/drivers/thermal/thermal_sysfs.c +++ b/drivers/thermal/thermal_sysfs.c @@ -128,9 +128,11 @@ trip_point_temp_store(struct device *dev, struct device_attribute *attr, if (kstrtoint(buf, 10, &temperature)) return -EINVAL; - ret = tz->ops->set_trip_temp(tz, trip, temperature); - if (ret) - return ret; + if (tz->ops->set_trip_temp) { + ret = tz->ops->set_trip_temp(tz, trip, temperature); + if (ret) + return ret; + } if (tz->trips) tz->trips[trip].temperature = temperature;