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Wed, 06 Nov 2024 15:03:46 -0800 (PST) Received: from [192.168.1.128] ([38.175.170.29]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4de5f83286fsm33597173.77.2024.11.06.15.03.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 Nov 2024 15:03:45 -0800 (PST) Message-ID: Date: Wed, 6 Nov 2024 16:03:44 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mfd: omap-usb-tll: handle clk_prepare return code in usbtll_omap_probe To: Karol Przybylski , aaro.koskinen@iki.fi, andreas@kemnade.info, khilman@baylibre.com, rogerq@kernel.org, tony@atomide.com, lee@kernel.org Cc: linux-omap@vger.kernel.org, linux-kernel@vger.kernel.org, Shuah Khan References: <20241106223324.479341-1-karprzy7@gmail.com> Content-Language: en-US From: Shuah Khan In-Reply-To: <20241106223324.479341-1-karprzy7@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 11/6/24 15:33, Karol Przybylski wrote: > clk_prepare() is called in usbtll_omap_probe to fill clk array. > Return code is not checked, leaving possible error condition unhandled. > > Added variable to hold return value from clk_prepare() and return statement > when it's not successful. > > Found in coverity scan, CID 1594680 > > Signed-off-by: Karol Przybylski > --- > drivers/mfd/omap-usb-tll.c | 8 ++++++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/mfd/omap-usb-tll.c b/drivers/mfd/omap-usb-tll.c > index 0f7fdb99c809..28446b082c85 100644 > --- a/drivers/mfd/omap-usb-tll.c > +++ b/drivers/mfd/omap-usb-tll.c > @@ -202,7 +202,7 @@ static int usbtll_omap_probe(struct platform_device *pdev) > struct device *dev = &pdev->dev; > struct usbtll_omap *tll; > void __iomem *base; > - int i, nch, ver; > + int i, nch, ver, err; > > dev_dbg(dev, "starting TI HSUSB TLL Controller\n"); > > @@ -251,7 +251,11 @@ static int usbtll_omap_probe(struct platform_device *pdev) > if (IS_ERR(tll->ch_clk[i])) > dev_dbg(dev, "can't get clock : %s\n", clkname); > else > - clk_prepare(tll->ch_clk[i]); Braces for the conditional don't looks right. > + err = clk_prepare(tll->ch_clk[i]); > + if (err) { > + dev_err(dev, "Unable to prepare clock\n"); > + return err; Did you check to see if callers handle this new error return in this path? > + } Same here > } > Same here > pm_runtime_put_sync(dev); thanks, -- Shuah