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[73.183.52.120]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-5170c403529sm10457421cf.10.2026.05.26.10.45.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 May 2026 10:45:44 -0700 (PDT) Date: Tue, 26 May 2026 13:45:43 -0400 From: Brian Masney To: "Alexander A. Klimov" Cc: Krzysztof Kozlowski , Michael Turquette , Stephen Boyd , Jonas Jensen , Mike Turquette , "moderated list:ARM/MOXA ART SOC" , "open list:COMMON CLK FRAMEWORK" , open list Subject: Re: [PATCH] clk: moxart: fix refcount leak Message-ID: References: <20260520175552.537603-1-grandmaster@al2klimov.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/2.3.1 (2026-03-20) Hi Alexander, On Thu, May 21, 2026 at 06:16:38AM +0200, Alexander A. Klimov wrote: > On 5/21/26 00:29, Brian Masney wrote: > > On Wed, May 20, 2026 at 07:55:50PM +0200, Alexander A. Klimov wrote: > > > Every value returned from of_clk_get() is supposed to be cleaned up > > > via clk_put() once not needed anymore. > > > The values here are used only for error checking, > > > but weren't cleaned up until now. > > > > > > Fixes: c7bb4fc16ead ("clk: add MOXA ART SoCs clock driver") > > > Signed-off-by: Alexander A. Klimov > > > --- > > > drivers/clk/clk-moxart.c | 2 ++ > > > 1 file changed, 2 insertions(+) > > > > > > diff --git a/drivers/clk/clk-moxart.c b/drivers/clk/clk-moxart.c > > > index 3786a0153ad1..7e191b1481bb 100644 > > > --- a/drivers/clk/clk-moxart.c > > > +++ b/drivers/clk/clk-moxart.c > > > @@ -39,6 +39,7 @@ static void __init moxart_of_pll_clk_init(struct device_node *node) > > > pr_err("%pOF: of_clk_get failed\n", node); > > > return; > > > } > > > + clk_put(ref_clk); > > > hw = clk_hw_register_fixed_factor(NULL, name, parent_name, 0, mul, 1); > > > if (IS_ERR(hw)) { > > > @@ -83,6 +84,7 @@ static void __init moxart_of_apb_clk_init(struct device_node *node) > > > pr_err("%pOF: of_clk_get failed\n", node); > > > return; > > > } > > > + clk_put(pll_clk); > > > > So this immediately drops the reference to the clk after of_clk_get() is > > called. Can we just remove these two of_clk_get() calls since they don't > > appear to be used? > Not if their purpose is to... idk... > check whether device_node is a clock at all, maybe? The clk driver already calls of_clk_get_parent_name(), and it validates the clock-output-names is valid. The of_clk_get() validations in this driver are redundant, unless I'm missing something. Brian