Date: Thu, 10 Oct 2013 18:08:54 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Hans Petter Selasky <hps@bitfrost.no> Cc: freebsd-usb@freebsd.org Subject: Re: USB config SX lock deadlock Message-ID: <7610BC59-ED91-4807-B145-7F7DD2C725E9@gsoft.com.au> In-Reply-To: <52564953.8080707@bitfrost.no> References: <9783900F-08A1-41FB-81B8-3C9809B82521@gsoft.com.au> <52553000.2010003@bitfrost.no> <A2C6A9D3-1595-41D2-A5C6-B544A3E40058@gsoft.com.au> <52554855.6030404@bitfrost.no> <FFD6BC71-0CAC-41AE-9450-6549F4B0E9C5@gsoft.com.au> <52564953.8080707@bitfrost.no>
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--Apple-Mail=_FDF4A3BB-FE69-470D-9323-2A8C49247B00 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=iso-8859-1 On 10/10/2013, at 16:59, Hans Petter Selasky <hps@bitfrost.no> wrote: >> It might under some circumstances but not directly. >>=20 >> It has 3 sub interfaces, if there is an error on one the the DAQ = program will call abort() which would result in FDs being closed. >>=20 >> However that sub interface does not use read/poll only ioctl. >>=20 > How do these IOCTLs work? They get turned into UT_READ_VENDOR_DEVICE requests in the driver. > Do you wakeup any sleepers at "surprise" detach? The usb_fifo_* code handles all wakeups so I am not sure. Generally speaking the DAQ program sees these as IO errors and will then = call abort() because the original code was for a PCI device and so it = assumed the device could never disappear. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --Apple-Mail=_FDF4A3BB-FE69-470D-9323-2A8C49247B00 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iD8DBQFSVlmO5ZPcIHs/zowRAg7uAJ0TinbJbxMlHitchOvaHiy/9Qe9KACdGseJ k6daGae5kHAQouKcP/T6ECM= =MGqh -----END PGP SIGNATURE----- --Apple-Mail=_FDF4A3BB-FE69-470D-9323-2A8C49247B00--
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