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[Xen-devel] out of dma-memory when using usblp-module in driverdomain
| To: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] out of dma-memory when using usblp-module in driverdomain |
| From: | Patrick Scharrenberg <pittipatti@xxxxxx> |
| Date: | Sun, 25 Mar 2007 16:29:12 +0200 |
| Delivery-date: | Sun, 25 Mar 2007 07:28:16 -0700 |
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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
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