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virtio-9p: 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 such a case in
v9fs_device_realize_common().

This commit is generated by command

    sed -n '/^virtio-9p$/,/^$/{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 <kwolf@redhat.com>
Reported-by: Greg Kurz <groug@kaod.org>
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Acked-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
[Commit message tweaked]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200707165037.1026246-7-armbru@redhat.com>
[ERRP_AUTO_PROPAGATE() renamed to ERRP_GUARD(), and
auto-propagated-errp.cocci to errp-guard.cocci.  Commit message
tweaked again.]
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-07-07 18:50:35 +02:00 committed by Markus Armbruster
parent 8b4b52759a
commit 92c451222c
2 changed files with 6 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
hw/9pfs/9p-local.c
View File

@ -1479,10 +1479,10 @@ static void error_append_security_model_hint(Error *const *errp)
static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse, Error **errp)
{
ERRP_GUARD();
const char *sec_model = qemu_opt_get(opts, "security_model");
const char *path = qemu_opt_get(opts, "path");
const char *multidevs = qemu_opt_get(opts, "multidevs");
Error *local_err = NULL;
if (!sec_model) {
error_setg(errp, "security_model property not set");
@ -1516,11 +1516,10 @@ static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse, Error **errp)
fse->export_flags &= ~V9FS_FORBID_MULTIDEVS;
fse->export_flags &= ~V9FS_REMAP_INODES;
} else {
error_setg(&local_err, "invalid multidevs property '%s'",
error_setg(errp, "invalid multidevs property '%s'",
multidevs);
error_append_hint(&local_err, "Valid options are: multidevs="
error_append_hint(errp, "Valid options are: multidevs="
"[remap|forbid|warn]\n");
error_propagate(errp, local_err);
return -1;
}
}
@ -1530,9 +1529,8 @@ static int local_parse_opts(QemuOpts *opts, FsDriverEntry *fse, Error **errp)
return -1;
}
if (fsdev_throttle_parse_opts(opts, &fse->fst, &local_err)) {
error_propagate_prepend(errp, local_err,
"invalid throttle configuration: ");
if (fsdev_throttle_parse_opts(opts, &fse->fst, errp)) {
error_prepend(errp, "invalid throttle configuration: ");
return -1;
}

1
hw/9pfs/9p.c
View File

@ -4011,6 +4011,7 @@ void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr)
int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t,
Error **errp)
{
ERRP_GUARD();
int i, len;
struct stat stat;
FsDriverEntry *fse;