Date: Sun, 20 Mar 2005 10:04:17 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: sebastien.b@swissinfo.org Cc: freebsd-usb@freebsd.org Subject: Re: Can we block in USB_ATTACH context ? Message-ID: <20050320.100417.27675329.imp@bsdimp.com> In-Reply-To: <200503201517.33598.sebastien.b@swissinfo.org> References: <200503201517.33598.sebastien.b@swissinfo.org>
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In message: <200503201517.33598.sebastien.b@swissinfo.org>
Sebastien B <sebastien.b@swissinfo.org> writes:
: Hello,
: Can I call functions that will block (ie. waiting for condition variables,
: acquiring MTX_DEF mutexes, ...) inside the USB_ATTACH section of a driver ?
: Or should I use a software interrupt handler that will perform the
: initialization of my USB device instead of doing this directly in
: USB_ATTACH ? (Lots of transfers have to be made before the device is ready...
: setting up the NET2280 PCI bridge, uploading a ~30kbyte firmware, reading
: configuration options of the device...)
It is safe to block in usb_attach routines. You will block all other
usb attachment activity, however. I believe that other usb transfers
will continue, but haven't verified it.
Warner
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