| Message ID | 20191011160552.22907-52-vsementsov@virtuozzo.com |
|---|---|
| State | New |
| Headers | show |
| Series | error: auto propagated local_err | expand |
On Fri, 11 Oct 2019 19:04:37 +0300 Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> wrote: > 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 == &fatal_err > (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 than 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_fatel, this means that we don't break error_abort > (we'll abort on error_set, not on error_propagate) > > This commit (together with its neighbors) was generated by > > for f in $(git grep -l errp \*.[ch]); do \ > spatch --sp-file scripts/coccinelle/auto-propagated-errp.cocci \ > --macro-file scripts/cocci-macro-file.h --in-place --no-show-diff $f; \ > done; > > then fix a bit of compilation problems: coccinelle for some reason > leaves several > f() { > ... > goto out; > ... > out: > } > patterns, with "out:" at function end. > > then > ./python/commit-per-subsystem.py MAINTAINERS "$(< auto-msg)" > > (auto-msg was a file with this commit message) > > Still, for backporting it may be more comfortable to use only the first > command and then do one huge commit. > > Reported-by: Kevin Wolf <kwolf@redhat.com> > Reported-by: Greg Kurz <groug@kaod.org> > Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> > --- > hw/s390x/s390-ccw.c | 19 +++++++++---------- > 1 file changed, 9 insertions(+), 10 deletions(-) Reviewed-by: Cornelia Huck <cohuck@redhat.com>
diff --git a/hw/s390x/s390-ccw.c b/hw/s390x/s390-ccw.c index 0c5a5b60bd..415fa04091 100644 --- a/hw/s390x/s390-ccw.c +++ b/hw/s390x/s390-ccw.c @@ -55,6 +55,7 @@ static void s390_ccw_get_dev_info(S390CCWDevice *cdev, char *sysfsdev, Error **errp) { + ERRP_AUTO_PROPAGATE(); unsigned int cssid, ssid, devid; char dev_path[PATH_MAX] = {0}, *tmp; @@ -86,19 +87,19 @@ static void s390_ccw_get_dev_info(S390CCWDevice *cdev, static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) { + ERRP_AUTO_PROPAGATE(); CcwDevice *ccw_dev = CCW_DEVICE(cdev); CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); DeviceState *parent = DEVICE(ccw_dev); SubchDev *sch; int ret; - Error *err = NULL; - s390_ccw_get_dev_info(cdev, sysfsdev, &err); - if (err) { - goto out_err_propagate; + s390_ccw_get_dev_info(cdev, sysfsdev, errp); + if (*errp) { + return; } - sch = css_create_sch(ccw_dev->devno, &err); + sch = css_create_sch(ccw_dev->devno, errp); if (!sch) { goto out_mdevid_free; } @@ -108,13 +109,13 @@ static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp) ccw_dev->sch = sch; ret = css_sch_build_schib(sch, &cdev->hostid); if (ret) { - error_setg_errno(&err, -ret, "%s: Failed to build initial schib", + error_setg_errno(errp, -ret, "%s: Failed to build initial schib", __func__); goto out_err; } - ck->realize(ccw_dev, &err); - if (err) { + ck->realize(ccw_dev, errp); + if (*errp) { goto out_err; } @@ -128,8 +129,6 @@ out_err: g_free(sch); out_mdevid_free: g_free(cdev->mdevid); -out_err_propagate: - error_propagate(errp, err); } static void s390_ccw_unrealize(S390CCWDevice *cdev, Error **errp)
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 == &fatal_err (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 than 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_fatel, this means that we don't break error_abort (we'll abort on error_set, not on error_propagate) This commit (together with its neighbors) was generated by for f in $(git grep -l errp \*.[ch]); do \ spatch --sp-file scripts/coccinelle/auto-propagated-errp.cocci \ --macro-file scripts/cocci-macro-file.h --in-place --no-show-diff $f; \ done; then fix a bit of compilation problems: coccinelle for some reason leaves several f() { ... goto out; ... out: } patterns, with "out:" at function end. then ./python/commit-per-subsystem.py MAINTAINERS "$(< auto-msg)" (auto-msg was a file with this commit message) Still, for backporting it may be more comfortable to use only the first command and then do one huge commit. Reported-by: Kevin Wolf <kwolf@redhat.com> Reported-by: Greg Kurz <groug@kaod.org> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> --- hw/s390x/s390-ccw.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-)