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From: Patrick Scharrenberg <pittipatti@web.de>
To: xen-devel <xen-devel@lists.xensource.com>
Subject: out of dma-memory when using usblp-module in driverdomain
Date: Sun, 25 Mar 2007 16:29:12 +0200	[thread overview]
Message-ID: <46068738.1000802@web.de> (raw)

Hi!

I tried attaching an usb-printer to an usb-port of a driver-domain.
On loading the module usblp I get the following error:

    /usr/src/xen/xen-unstable.hg/linux-2.6.18-xen/drivers/usb/class/usblp.c:
    out of memory for write buf
    usblp: probe of 2-1:1.0 failed with error -5


I figured out, that reducing USBLP_BUF_SIZE (usb/class/usblp.c) form
8192 to some smaller value, e.g. 4096 it works fine, but that's just a
workaround.

USBLP_BUF_SIZE is used to "usb_buffer_alloc" (usb/core/usb.c) dma memory:

>From usb.c:
     usb_buffer_alloc - allocate dma-consistent buffer for
URB_NO_xxx_DMA_MAP

but here I'm out..


cheers
~patrick

             reply	other threads:[~2007-03-25 14:29 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-25 14:29 Patrick Scharrenberg [this message]
2007-03-26  7:23 ` out of dma-memory when using usblp-module in driverdomain Jan Beulich
2007-04-10 15:01   ` Patrick Scharrenberg

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