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Re: [PATCH v12 7/8] nbd: Use ERRP_AUTO_PROPAGATE()

On 7/7/20 11:50 AM, Markus Armbruster wrote:
From: Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxx>

If we want to add some info to errp (by error_prepend() or
error_append_hint()), we must use the ERRP_AUTO_PROPAGATE macro.
Otherwise, this info will not be added when errp == &error_fatal
(the program will exit prior to the error_append_hint() or
error_prepend() call).  Fix such cases.

If we want to check error after errp-function call, we need to
introduce local_err and then propagate it to errp. Instead, use
ERRP_AUTO_PROPAGATE macro, benefits are:
1. No need of explicit error_propagate call
2. No need of explicit local_err variable: use errp directly
3. ERRP_AUTO_PROPAGATE leaves errp as is if it's not NULL or
    &error_fatal, this means that we don't break error_abort
    (we'll abort on error_set, not on error_propagate)

This commit is generated by command

     sed -n '/^Network Block Device (NBD)$/,/^$/{s/^F: //p}' \
         MAINTAINERS | \
     xargs git ls-files | grep '\.[hc]$' | \
     xargs spatch \
         --sp-file scripts/coccinelle/auto-propagated-errp.cocci \
         --macro-file scripts/cocci-macro-file.h \
         --in-place --no-show-diff --max-width 80

Reported-by: Kevin Wolf <kwolf@xxxxxxxxxx>
Reported-by: Greg Kurz <groug@xxxxxxxx>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxx>
Reviewed-by: Markus Armbruster <armbru@xxxxxxxxxx>
[Commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@xxxxxxxxxx>

Reviewed-by: Eric Blake <eblake@xxxxxxxxxx>

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org



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