From 795d946d0797e7ba28ed97c86e2592e346b02b0e Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Tue, 7 Jul 2020 18:50:36 +0200 Subject: nbd: Use ERRP_GUARD() If we want to check error after errp-function call, we need to introduce local_err and then propagate it to errp. Instead, use the ERRP_GUARD() macro, benefits are: 1. No need of explicit error_propagate call 2. No need of explicit local_err variable: use errp directly 3. ERRP_GUARD() 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) If we want to add some info to errp (by error_prepend() or error_append_hint()), we must use the ERRP_GUARD() 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 several such cases, e.g. in nbd_read(). 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/errp-guard.cocci \ --macro-file scripts/cocci-macro-file.h \ --in-place --no-show-diff --max-width 80 Reported-by: Kevin Wolf Reported-by: Greg Kurz Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Markus Armbruster [Commit message tweaked] Signed-off-by: Markus Armbruster Message-Id: <20200707165037.1026246-8-armbru@redhat.com> Reviewed-by: Eric Blake [ERRP_AUTO_PROPAGATE() renamed to ERRP_GUARD(), and auto-propagated-errp.cocci to errp-guard.cocci. Commit message tweaked again.] --- include/block/nbd.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/block') diff --git a/include/block/nbd.h b/include/block/nbd.h index 20363280ae..9bc3bfaeec 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -361,6 +361,7 @@ void nbd_server_start_options(NbdServerOptions *arg, Error **errp); static inline int nbd_read(QIOChannel *ioc, void *buffer, size_t size, const char *desc, Error **errp) { + ERRP_GUARD(); int ret = qio_channel_read_all(ioc, buffer, size, errp) < 0 ? -EIO : 0; if (ret < 0) { -- cgit v1.2.3-55-g7522