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With a Xen debug kernel (PAE off), iwi(4) is not able to attach during
autoconf ("XENMEM_decrease_reservation failed!" issue) on my laptop.
This should not be fatal to the boot process, but in fact, it is; errors
are (from my PoV) incorrectly handled in if_iwi.c.
I have local fixes to it . However, as it is not a part of the kernel
I am familiar with, I would like more experienced people to review my patch:
- some bus_dma fix, with checks against invalid dmap.
- move the (RX and TX) rings' allocation code later in iwi_attach() to
avoid NULL pointer dereference if allocation fails (iwi_detach()
manipulates structure variables that are not set in case of a failed
- avoid double free in case of failure during attach. If an allocation
fails, do not free it directly, this is handled by iwi_detach() routine.
- only set ring->count for RX/TX rings when ring malloc() is successful,
or else the for loop during detach will fail with a NULL dereference.
Tested with current GENERIC, XEN3_DOM0 and XEN3PAE_DOM0. Did not notice
any regression so far.
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