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[67.149.105.175]) by smtp.gmail.com with ESMTPSA id p5sm12287644qkj.35.2021.04.14.07.03.46 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 14 Apr 2021 07:03:47 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.40.0.2.32\)) Subject: Re: Mac OS real USB device support issue From: Programmingkid In-Reply-To: <20210409080804.vs2r546gy3ntdmgr@sirius.home.kraxel.org> Date: Wed, 14 Apr 2021 10:03:45 -0400 Content-Transfer-Encoding: quoted-printable Message-Id: <1F8803E0-D336-4B36-AC0B-7824678E7C52@gmail.com> References: <967C172F-B708-40A2-862E-9948F0844133@gmail.com> <725920c9-c990-d35a-4958-4df0c45c62@eik.bme.hu> <0429B873-DD42-4769-BCDF-25A7720D9C44@gmail.com> <20210408110523.eh3i7djynv54cqi2@sirius.home.kraxel.org> <20210409080804.vs2r546gy3ntdmgr@sirius.home.kraxel.org> To: Gerd Hoffmann X-Mailer: Apple Mail (2.3654.40.0.2.32) Received-SPF: pass client-ip=2607:f8b0:4864:20::730; envelope-from=programmingkidx@gmail.com; helo=mail-qk1-x730.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Howard Spoelstra , QEMU devel list Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" > On Apr 9, 2021, at 4:08 AM, Gerd Hoffmann wrote: >=20 > Hi, >=20 >> The questions that come to mind are: >> - Does libusb_detach_kernel_driver() work on Mac OS? >> - Is libusb_detach_kernel_driver() called on Mac OS in QEMU? >>=20 >> The only mention of this function in QEMU comes from host-libusb.c.=20= >>=20 >> After some tests I found out the function >> host-libusb.c:usb_host_detach_kernel() is being called on Mac OS = 11.1. >> It never reaches the libusb_detach_kernel_driver() function. It stops >> at the continue statement. >=20 > Yep. Most likely libusb_kernel_driver_active() returns 0 because the > kernel driver management functions are not implemented for macos. >=20 > take care, > Gerd >=20 I was wondering about the usb_host_detach_kernel() code. It iterates = thru interface 0 to 15. Why does it stop at 15? Isn't possible to have = up to 255 interfaces?=