[ipxe-devel] [PATCH] Modify snpnet.c to not poll for transmit completions

[Jarrod Johnson]

There are at least two SNP implementations that potentially do not play
well with snpnet.c expectations (iPXE's own and some versions of at least
one vendor's implementation).  iPXE returns a pointer that has nothing to
do with the data transmitted.  Another vendor fails to ever return a null
in some versions.

Rather than wait for a null pointer to come back every polling interval,
freeing matching non-null pointers as it goes, instead on every transmit
wait for a non-null pointer and free the iobuf regardless of the actual
pointer returned.  This more approximates the behavior of the UEFI core PXE
stack.

https://git.ipxe.org/vendor/xcat/ipxe.git/commitdiff/03281fe80a9346acdd6f34f8744740520017113b
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