From mboxrd@z Thu Jan 1 00:00:00 1970 From: alexandre.belloni@bootlin.com (Alexandre Belloni) Date: Tue, 14 Aug 2018 14:59:54 +0200 Subject: [PATCH] arm/mach-at91/pm: Do not double put the device node In-Reply-To: <1534211696-4221-1-git-send-email-zhongjiang@huawei.com> References: <1534211696-4221-1-git-send-email-zhongjiang@huawei.com> Message-ID: <20180814125954.GM943@piout.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 14/08/2018 09:54:56+0800, zhong jiang wrote: > Device node iterators put the previous value of the index variable, > so an explicit put causes a double put. > While for_each_matching_node_and_match will get and put the node properly, there is also a call to of_find_device_by_node that will get a reference to the node. > I detect the issue with the help of Coccinelle. > > Signed-off-by: zhong jiang > --- > arch/arm/mach-at91/pm.c | 5 +---- > 1 file changed, 1 insertion(+), 4 deletions(-) > > diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c > index 32fae4d..a5ec35f 100644 > --- a/arch/arm/mach-at91/pm.c > +++ b/arch/arm/mach-at91/pm.c > @@ -143,15 +143,12 @@ static int at91_pm_config_ws(unsigned int pm_mode, bool set) > > /* Check if enabled on SHDWC. */ > if (wsi->shdwc_mr_bit && !(val & wsi->shdwc_mr_bit)) > - goto put_node; > + continue; > > mode |= wsi->pmc_fsmr_bit; > if (wsi->set_polarity) > polarity |= wsi->pmc_fsmr_bit; > } > - > -put_node: > - of_node_put(np); > } > > if (mode) { > -- > 1.7.12.4 > -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com