From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751674AbaANMX6 (ORCPT ); Tue, 14 Jan 2014 07:23:58 -0500 Received: from 82-68-191-81.dsl.posilan.com ([82.68.191.81]:57712 "EHLO rainbowdash.ducie.codethink.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751524AbaANMXr (ORCPT ); Tue, 14 Jan 2014 07:23:47 -0500 From: Ben Dooks To: linux-kernel@lists.codethink.co.uk, "Rafael J. Wysocki" , linux-sh@vger.kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman Cc: Ben Dooks , Pavel Machek , linux-pm@vger.kernel.org Subject: [PATCH 1/3] power: clock_ops.c: fixup clk prepare/unprepare count Date: Tue, 14 Jan 2014 12:23:40 +0000 Message-Id: <1389702222-17260-2-git-send-email-ben.dooks@codethink.co.uk> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1389702222-17260-1-git-send-email-ben.dooks@codethink.co.uk> References: <1389702222-17260-1-git-send-email-ben.dooks@codethink.co.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The drivers/base/power/clock_ops.c file is causing warnings from the clock driver (as shown below) due to failing to do a clk_prepare() call before enabling a clock. It also fails to check the balance of prepare/unprepare as __pm_clk_remove() do clk_disable_unprepare() call. This bug has probably been in since commit b2476490e ("clk: introduce the common clock framework") as the warning was part of the original commit. It is strange that it has not been noticed (although this has also been coupled with a failure for certain SH builds to not build the necessary glue to use this method of controlling the clocks). In summary, this is probably needed in several stable branches but need advice on which ones. On the Renesas Lager board, this causes numerous warnings of the following and even worse the clock system will not enable clocks, causing drivers that are in development to fail to work: WARNING: CPU: 0 PID: 1 at drivers/clk/clk.c:883 __clk_enable+0x2c/0xa0() Cc: "Rafael J. Wysocki" Cc: Pavel Machek Cc: Greg Kroah-Hartman Cc: linux-pm@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Ben Dooks Reviewed-by: Ian Molton --- drivers/base/power/clock_ops.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/base/power/clock_ops.c b/drivers/base/power/clock_ops.c index 9d8fde7..b9dd8fa 100644 --- a/drivers/base/power/clock_ops.c +++ b/drivers/base/power/clock_ops.c @@ -43,6 +43,7 @@ static void pm_clk_acquire(struct device *dev, struct pm_clock_entry *ce) if (IS_ERR(ce->clk)) { ce->status = PCE_STATUS_ERROR; } else { + clk_prepare(ce->clk); ce->status = PCE_STATUS_ACQUIRED; dev_dbg(dev, "Clock %s managed by runtime PM.\n", ce->con_id); } @@ -99,10 +100,12 @@ static void __pm_clk_remove(struct pm_clock_entry *ce) if (ce->status < PCE_STATUS_ERROR) { if (ce->status == PCE_STATUS_ENABLED) - clk_disable_unprepare(ce->clk); + clk_disable(ce->clk); - if (ce->status >= PCE_STATUS_ACQUIRED) + if (ce->status >= PCE_STATUS_ACQUIRED) { + clk_unprepare(ce->clk); clk_put(ce->clk); + } } kfree(ce->con_id); -- 1.8.5.2