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[34.82.11.139]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2fc13ba5f27sm14323197a91.43.2025.02.20.11.31.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Feb 2025 11:31:31 -0800 (PST) Date: Thu, 20 Feb 2025 11:31:27 -0800 From: William McVicker To: Greg Kroah-Hartman Cc: Prashanth K , Thinh Nguyen , Peter Korsgaard , Sabyrzhan Tasbolatov , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, andre.draszik@linaro.org, kernel-team@android.com Subject: Re: [PATCH v2] usb: gadget: Set self-powered based on MaxPower and bmAttributes Message-ID: References: <20250217120328.2446639-1-prashanth.k@oss.qualcomm.com> <2025022032-cruelness-framing-2a10@gregkh> 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: <2025022032-cruelness-framing-2a10@gregkh> On 02/20/2025, Greg Kroah-Hartman wrote: > On Thu, Feb 20, 2025 at 10:09:38AM -0800, William McVicker wrote: > > Hi Prashanth, > > > > On 02/17/2025, Prashanth K wrote: > > > Currently the USB gadget will be set as bus-powered based solely > > > on whether its bMaxPower is greater than 100mA, but this may miss > > > devices that may legitimately draw less than 100mA but still want > > > to report as bus-powered. Similarly during suspend & resume, USB > > > gadget is incorrectly marked as bus/self powered without checking > > > the bmAttributes field. Fix these by configuring the USB gadget > > > as self or bus powered based on bmAttributes, and explicitly set > > > it as bus-powered if it draws more than 100mA. > > > > > > Cc: stable@vger.kernel.org > > > Fixes: 5e5caf4fa8d3 ("usb: gadget: composite: Inform controller driver of self-powered") > > > Signed-off-by: Prashanth K > > > --- > > > Changes in v2: > > > - Didn't change anything from RFC. > > > - Link to RFC: https://lore.kernel.org/all/20250204105908.2255686-1-prashanth.k@oss.qualcomm.com/ > > > > > > drivers/usb/gadget/composite.c | 16 +++++++++++----- > > > 1 file changed, 11 insertions(+), 5 deletions(-) > > > > > > diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c > > > index bdda8c74602d..1fb28bbf6c45 100644 > > > --- a/drivers/usb/gadget/composite.c > > > +++ b/drivers/usb/gadget/composite.c > > > @@ -1050,10 +1050,11 @@ static int set_config(struct usb_composite_dev *cdev, > > > else > > > usb_gadget_set_remote_wakeup(gadget, 0); > > > done: > > > - if (power <= USB_SELF_POWER_VBUS_MAX_DRAW) > > > - usb_gadget_set_selfpowered(gadget); > > > - else > > > + if (power > USB_SELF_POWER_VBUS_MAX_DRAW || > > > + !(c->bmAttributes & USB_CONFIG_ATT_SELFPOWER)) > > > usb_gadget_clear_selfpowered(gadget); > > > + else > > > + usb_gadget_set_selfpowered(gadget); > > > > > > usb_gadget_vbus_draw(gadget, power); > > > if (result >= 0 && cdev->delayed_status) > > > @@ -2615,7 +2616,9 @@ void composite_suspend(struct usb_gadget *gadget) > > > > > > cdev->suspended = 1; > > > > > > - usb_gadget_set_selfpowered(gadget); > > > + if (cdev->config->bmAttributes & USB_CONFIG_ATT_SELFPOWER) > > > + usb_gadget_set_selfpowered(gadget); > > > > I'm hitting a null pointer derefence here on my Pixel 6 device on suspend. I > > haven't dug deep into it how we get here, but in my case `cdev->config` is > > NULL. This happens immediate after booting my device. I verified that just > > adding a NULL check fixes the issue and dwc3 gadget can successfully suspend. > > This was just fixed in my tree today with this commit: > https://lore.kernel.org/r/20250220120314.3614330-1-m.szyprowski@samsung.com > > Hope this helps, > > greg k-h Yup, works for me. Thanks! --Will