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([2001:da8:205:20a0:6eeb:b6ff:fe15:94a7]) by newxmesmtplogicsvrsza53-0.qq.com (NewEsmtp) with SMTP id E111DE10; Wed, 11 Mar 2026 21:56:17 +0800 X-QQ-mid: xmsmtpt1773237377ty1o3sjo7 Message-ID: X-QQ-XMAILINFO: OIJV+wUmQOUAP2RiU7AszV5h0akRExrROY4HWo3RaWpE+EdEdLqCeOv4CgAzpK KmNPva4/tt+XkNcm45EhU93CDu/bSFtM5MazeyJijsIITdBULuWjKxefOruB/DpZGoay/efiMCC7 cjWwZNmc3n2VEQU3uQx1l/DcReyzTjZYvQ67JituoIM6UeTHZo7SAVXpEAJV2dkEme3DQJ/F1faH n3TJW2skzcg/1kdUcBiZrRLIPgTZK2ofxWJSxNnZUDsFn4elcndNSkGJlPhMgUKxvu1w7FJp+f/P 7JgEqvpnuleaP6KTFLi6aW24lLJIml1ypz9QZXsahNzZKqcClbnhscXSooln5SJCY7Z5TTtar4KM uI2S8rJn8/mZAG5Gpr1wMXjfdlDXwQwpK1qZqmB0cnB2v5oRUK/afAMfCQmdsafgxPgIFqe3D7yE 9ANCGf61M2VHHovgN2U37rdQFuVJKTsExVwCHdatr8GFXHeeR2n/9c4rq6CXc4wYTaO3EYiswO56 jL7guT6yZn9B1H3xfNZ8riHUj93EAYe652ear57WGY+GlpE2afWFth6xRn9Ro6aYNsqmUDFx9EcN ehNSl4eTZd/pITf8YzidUqhQmDtASo1fLVDo0Cz4kG49jBdByvfXd+TvgRq1R8afO99lwKwpi6wH HFZg9XK9IP/+GbayUtK9p5BDvFdt/JlOBlpL6dCOxkQhv2MbZ/+VLkGoFks7rR8SBilyBjq7Xk6j OeXoWd8S+86FrYxTCdpmt5HjN6HysNyKuQYWG+I9hTZX/Kn2HtP4wOp0AjFgoqYA0wiUQSK9LM4E H3Wy3oL6iD/L7anoMl9KrfRQS5wcqozIvftOGAm5ixj0Se0w/GaO8RrsZSt6/oOPBcOVKSlB0unF aGOQuYIuCoh7J8c2njbNRkDv9MRNKy45JWnUyNcE+fUt0+2+D4hjMZuj5Muf2smkh5Nsb+DN9T7M Tca/HlKS320nmcMlgIW0HuEVsJozd2H3OdbcbPBad+4rx8Vx9z0naNCG2nFUyeNzYHBVvG/EJQrw UkWmPAacVzwwrZFQYVEjvW4k89CLpI5Z3x6mrt+/8yjDUgI/MRmuzUKZroxNw= X-QQ-XMRINFO: MPJ6Tf5t3I/ylTmHUqvI8+Wpn+Gzalws3A== From: Zhaoyang Yu <2426767509@qq.com> To: gregkh@linuxfoundation.org Cc: sergei.shtylyov@gmail.com, daniel@zonque.org, haojian.zhuang@gmail.com, robert.jarzmik@free.fr, linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Zhaoyang Yu <2426767509@qq.com> Subject: [PATCH v3] USB: pxa27x_udc: check return value of clk_enable Date: Wed, 11 Mar 2026 13:56:14 +0000 X-OQ-MSGID: <20260311135614.283723-1-2426767509@qq.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" clk_enable() may fail according to the API contract. Previously, udc_enable() ignored its return value and returned void. Modify udc_enable() to return the error code. Additionally, update all of its callers (pxa_udc_pullup, pxa_udc_vbus_session, pxa27x_udc_start, pxa_udc_probe, and pxa_udc_resume) to check this return value and handle the failure properly with necessary cleanups or rollbacks. Signed-off-by: Zhaoyang Yu <2426767509@qq.com> --- Changes in v3: - Changed udc_enable() return type from void to int. - Propagated the error to all caller functions and added proper error handling/rollback per Greg KH's review. Changes in v2: - Fixed a formatting issue by moving the 'int ret' declaration to the beginning of the function block. drivers/usb/gadget/udc/pxa27x_udc.c | 60 ++++++++++++++++++++++------- 1 file changed, 46 insertions(+), 14 deletions(-) diff --git a/drivers/usb/gadget/udc/pxa27x_udc.c b/drivers/usb/gadget/udc/p= xa27x_udc.c index 897f53601b5b..0a5f05f8e73c 100644 --- a/drivers/usb/gadget/udc/pxa27x_udc.c +++ b/drivers/usb/gadget/udc/pxa27x_udc.c @@ -1462,7 +1462,7 @@ static int pxa_udc_wakeup(struct usb_gadget *_gadget) return 0; } =20 -static void udc_enable(struct pxa_udc *udc); +static int udc_enable(struct pxa_udc *udc); static void udc_disable(struct pxa_udc *udc); =20 /** @@ -1519,14 +1519,18 @@ static int should_disable_udc(struct pxa_udc *udc) static int pxa_udc_pullup(struct usb_gadget *_gadget, int is_active) { struct pxa_udc *udc =3D to_gadget_udc(_gadget); + int ret; =20 if (!udc->gpiod && !udc->udc_command) return -EOPNOTSUPP; =20 dplus_pullup(udc, is_active); =20 - if (should_enable_udc(udc)) - udc_enable(udc); + if (should_enable_udc(udc)) { + ret =3D udc_enable(udc); + if (ret) + return ret; + } if (should_disable_udc(udc)) udc_disable(udc); return 0; @@ -1545,10 +1549,14 @@ static int pxa_udc_pullup(struct usb_gadget *_gadge= t, int is_active) static int pxa_udc_vbus_session(struct usb_gadget *_gadget, int is_active) { struct pxa_udc *udc =3D to_gadget_udc(_gadget); + int ret; =20 udc->vbus_sensed =3D is_active; - if (should_enable_udc(udc)) - udc_enable(udc); + if (should_enable_udc(udc)) { + ret =3D udc_enable(udc); + if (ret) + return ret; + } if (should_disable_udc(udc)) udc_disable(udc); =20 @@ -1691,12 +1699,18 @@ static void udc_init_data(struct pxa_udc *dev) * Enables the udc device : enables clocks, udc interrupts, control endpoi= nt * interrupts, sets usb as UDC client and setups endpoints. */ -static void udc_enable(struct pxa_udc *udc) +static int udc_enable(struct pxa_udc *udc) { + int ret; + if (udc->enabled) - return; + return 0; =20 - clk_enable(udc->clk); + ret =3D clk_enable(udc->clk); + if (ret) { + dev_err(udc->dev, "clk_enable failed: %d\n", ret); + return ret; + } udc_writel(udc, UDCICR0, 0); udc_writel(udc, UDCICR1, 0); udc_clear_mask_UDCCR(udc, UDCCR_UDE); @@ -1726,6 +1740,8 @@ static void udc_enable(struct pxa_udc *udc) pio_irq_enable(&udc->pxa_ep[0]); =20 udc->enabled =3D 1; + + return 0; } =20 /** @@ -1761,10 +1777,16 @@ static int pxa27x_udc_start(struct usb_gadget *g, } } =20 - if (should_enable_udc(udc)) - udc_enable(udc); + if (should_enable_udc(udc)) { + retval =3D udc_enable(udc); + if (retval) + goto fail_enable; + } return 0; =20 +fail_enable: + if (!IS_ERR_OR_NULL(udc->transceiver)) + otg_set_peripheral(udc->transceiver->otg, NULL); fail: udc->driver =3D NULL; return retval; @@ -2430,10 +2452,16 @@ static int pxa_udc_probe(struct platform_device *pd= ev) goto err_add_gadget; =20 pxa_init_debugfs(udc); - if (should_enable_udc(udc)) - udc_enable(udc); + if (should_enable_udc(udc)) { + retval =3D udc_enable(udc); + if (retval) + goto err_enable; + } return 0; =20 +err_enable: + usb_del_gadget_udc(&udc->gadget); + pxa_cleanup_debugfs(udc); err_add_gadget: if (!IS_ERR_OR_NULL(udc->transceiver)) usb_unregister_notifier(udc->transceiver, &pxa27x_udc_phy); @@ -2509,13 +2537,17 @@ static int pxa_udc_resume(struct platform_device *_= dev) { struct pxa_udc *udc =3D platform_get_drvdata(_dev); struct pxa_ep *ep; + int ret; =20 ep =3D &udc->pxa_ep[0]; udc_ep_writel(ep, UDCCSR, udc->udccsr0 & (UDCCSR0_FST | UDCCSR0_DME)); =20 dplus_pullup(udc, udc->pullup_resume); - if (should_enable_udc(udc)) - udc_enable(udc); + if (should_enable_udc(udc)) { + ret =3D udc_enable(udc); + if (ret) + return ret; + } /* * We do not handle OTG yet. * --=20 2.34.1