Return-Path: MIME-Version: 1.0 In-Reply-To: References: Date: Thu, 16 Oct 2014 12:43:22 +0530 Message-ID: Subject: Re: btusb_intr_complete returns -EPIPE From: Naveen Kumar Parna To: Alan Stern Cc: Oliver Neukum , "linux-bluetooth@vger.kernel.org" , linux-usb@vger.kernel.org, acho@suse.com Content-Type: multipart/mixed; boundary=047d7bdc78f8de497f050584fb14 Sender: linux-bluetooth-owner@vger.kernel.org List-ID: --047d7bdc78f8de497f050584fb14 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable > It's entirely possible that the stall packets are created by the hub. > When a full-speed device is connected to a USB-2 hub, and the device > fails to respond to a packet sent by the host, the hub reports this > failure as a stall. Here I don=E2=80=99t think device fails to respond to a packet sent by the host. I verified this by connecting Ellisys USB analyser in between host and devices. For example Look at the attached(Sample_HciEvt.png) HCI event captured by Ellisys USB analyser. It is a valid HCI event from device to Host. IN transaction 96 1 ACK FS 16 bytes (FF 2F C2 01 00 17 00 DF 00 01 10 00 00 A9 EE 0F) IN transaction 96 1 ACK FS 16 bytes (00 00 00 5A 06 9D 39 00 00 66 00 00 00 00 00 00) IN transaction 96 1 ACK FS 16 bytes (00 00 00 00 00 00 00 00 00 00 00 8E 05 28 00 01) IN transaction 96 1 ACK FS 1 byte (00) Due to spurious stall packets , sometimes btusb driver is not receiving this full event , instead it got STALL packet instead of first 16 bytes plus rest of other 33 bytes. > When the device is connected to an OHCI controller, such failures would > be reported in a different way, such as a -EPROTO or -EILSEQ status. > I did not observed -EPROTO or -EILSEQ status in OHCI controller scenario. 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