From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754691AbcEBR2c (ORCPT ); Mon, 2 May 2016 13:28:32 -0400 Received: from lists.s-osg.org ([54.187.51.154]:49919 "EHLO lists.s-osg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754023AbcEBR2Y (ORCPT ); Mon, 2 May 2016 13:28:24 -0400 From: Javier Martinez Canillas To: linux-kernel@vger.kernel.org Cc: Marek Szyprowski , Krzysztof Kozlowski , Javier Martinez Canillas , Mauro Carvalho Chehab , Kamil Debski , Jeongtae Park , Kyungmin Park , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Subject: [PATCH] s5p-mfc: Don't try to put pm->clock if lookup failed Date: Mon, 2 May 2016 13:27:54 -0400 Message-Id: <1462210075-5320-1-git-send-email-javier@osg.samsung.com> X-Mailer: git-send-email 2.5.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Failing to get the struct s5p_mfc_pm .clock is a non-fatal error so the clock field can have a errno pointer value. But s5p_mfc_final_pm() only checks if .clock is not NULL before attempting to unprepare and put it. This leads to the following warning in clk_put() due s5p_mfc_final_pm(): WARNING: CPU: 3 PID: 1023 at drivers/clk/clk.c:2814 s5p_mfc_final_pm+0x48/0x74 [s5p_mfc] CPU: 3 PID: 1023 Comm: rmmod Tainted: G W 4.6.0-rc6-next-20160502-00005-g5a15a49106bc #9 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [] (show_stack) from [] (dump_stack+0x88/0x9c) [] (dump_stack) from [] (__warn+0xe8/0x100) [] (__warn) from [] (warn_slowpath_null+0x20/0x28) [] (warn_slowpath_null) from [] (s5p_mfc_final_pm+0x48/0x74 [s5p_mfc]) [] (s5p_mfc_final_pm [s5p_mfc]) from [] (s5p_mfc_remove+0x8c/0x94 [s5p_mfc]) [] (s5p_mfc_remove [s5p_mfc]) from [] (platform_drv_remove+0x24/0x3c) [] (platform_drv_remove) from [] (__device_release_driver+0x84/0x110) [] (__device_release_driver) from [] (driver_detach+0xac/0xb0) [] (driver_detach) from [] (bus_remove_driver+0x4c/0xa0) [] (bus_remove_driver) from [] (SyS_delete_module+0x174/0x1b8) [] (SyS_delete_module) from [] (ret_fast_syscall+0x0/0x3c) So check if the pointer is not an errno value before calling clk_put(). Signed-off-by: Javier Martinez Canillas --- drivers/media/platform/s5p-mfc/s5p_mfc_pm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c b/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c index 5f97a3398c11..d011f30be265 100644 --- a/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_pm.c @@ -85,7 +85,7 @@ err_g_ip_clk: void s5p_mfc_final_pm(struct s5p_mfc_dev *dev) { if (dev->variant->version != MFC_VERSION_V6 && - pm->clock) { + !IS_ERR_OR_NULL(pm->clock)) { clk_disable_unprepare(pm->clock); clk_put(pm->clock); } -- 2.5.5