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[34.140.83.185]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-428e8d6555fsm29041605e9.26.2024.08.02.07.04.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Aug 2024 07:04:31 -0700 (PDT) From: Tudor Ambarus To: gregkh@linuxfoundation.org, hgajjar@de.adit-jv.com, willmcvicker@google.com Cc: paul@crapouillou.net, brauner@kernel.org, christian.koenig@amd.com, jlayton@kernel.org, kees@kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, andre.draszik@linaro.org, peter.griffin@linaro.org, Tudor Ambarus Subject: [PATCH 1/2] usb: gadget: f_fs: restore ffs_func_disable() functionality Date: Fri, 2 Aug 2024 14:04:27 +0000 Message-ID: <20240802140428.2000312-2-tudor.ambarus@linaro.org> X-Mailer: git-send-email 2.46.0.rc2.264.g509ed76dc8-goog In-Reply-To: <20240802140428.2000312-1-tudor.ambarus@linaro.org> References: <20240802140428.2000312-1-tudor.ambarus@linaro.org> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The blamed commit made ffs_func_disable() always return -EINVAL as the method calls ffs_func_set_alt() with the ``alt`` argument being ``(unsigned)-1``, which is always greater than MAX_ALT_SETTINGS. Use the MAX_ALT_SETTINGS check just in the f->set_alt() code path, f->disable() doesn't care about the ``alt`` parameter. Make a surgical fix, but really the f->disable() code shall be pulled out from ffs_func_set_alt(), the code will become clearer. A patch will follow. Note that ffs_func_disable() always returning -EINVAL made pixel6 crash on USB disconnect. Fixes: 2f550553e23c ("usb: gadget: f_fs: Add the missing get_alt callback") Reported-by: William McVicker Signed-off-by: Tudor Ambarus --- drivers/usb/gadget/function/f_fs.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index d8b096859337..0bfed1741b3e 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -3731,10 +3731,10 @@ static int ffs_func_set_alt(struct usb_function *f, struct ffs_data *ffs = func->ffs; int ret = 0, intf; - if (alt > MAX_ALT_SETTINGS) - return -EINVAL; - if (alt != (unsigned)-1) { + if (alt > MAX_ALT_SETTINGS) + return -EINVAL; + intf = ffs_func_revmap_intf(func, interface); if (intf < 0) return intf;