Re: [PATCH for-4.6] libxl: fix libxl__build_hvm error code return path

[Ian Jackson <Ian.Jackson@eu.citrix.com>]

Wei Liu writes ("[PATCH for-4.6] libxl: fix libxl__build_hvm error code return path"):
> In 25652f23 ("tools/libxl: detect and avoid conflicts with RDM"), new
> code was added to use rc to store libxl function call return value,
> which complied to libxl coding style. That patch, however, didn't change
> other locations where return value was stored in ret. In the end
> libxl__build_hvm could return 0 when it failed.
> 
> Explicitly set rc to ERROR_FAIL in all error paths to fix this.
...
>          ret = libxl__vnuma_build_vmemrange_hvm(gc, domid, info, state, &args);
>          if (ret) {

Why not change all the assignemnts to ret to assignments to rc, and
abolish ret ?

>              LOGEV(ERROR, ret, "hvm build vmemranges failed");
> +            rc = ERROR_FAIL;

Certainly this is wrong because it smashes all errors into ERROR_FAIL.

Ian.