[Xen-devel] question regarding 2.6.18 backport

[Andrew Jones <drjones@xxxxxxxxxx>]

Hi Ian,

I believe there's a problem with the 2.6.18 reference tree backport of
48856286b64e: "xen/netback: shutdown the ring if it contains garbage",
which is c/s 1219. While the version in Linus' tree should be fine,
as xen_netbk_tx_action runs in a kthread, the 2.6.18 version needs
something different. In 2.6.18 net_tx_action is a tasklet, thus calling
xenvif_carrier_off from it is problematic due to needing the rtnl
mutex. A proposal I have that I haven't tried yet is for
netbk_fatal_tx_err to schedule xenvif_carrier_off in a workqueue. This
is a bit ugly though since the main point of xenvif_carrier_off is to
queue linkwatch work. I'm wondering if you or anyone else have other
suggestions.

Thanks,
Drew

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