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monitor: Use LOCK_GUARD macros

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Use the lock guard macros in monitor/misc.c - saves
a lot of unlocks in error paths, and the occasional goto.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20200922095741.101911-1-dgilbert@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2020-09-22 10:57:41 +01:00
parent 894f021411
commit 0210c3b39b
1 changed files with 14 additions and 30 deletions
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44
monitor/misc.c
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@ -141,13 +141,13 @@ char *qmp_human_monitor_command(const char *command_line, bool has_cpu_index,
handle_hmp_command(&hmp, command_line);
cur_mon = old_mon;
qemu_mutex_lock(&hmp.common.mon_lock);
if (qstring_get_length(hmp.common.outbuf) > 0) {
output = g_strdup(qstring_get_str(hmp.common.outbuf));
} else {
output = g_strdup("");
WITH_QEMU_LOCK_GUARD(&hmp.common.mon_lock) {
if (qstring_get_length(hmp.common.outbuf) > 0) {
output = g_strdup(qstring_get_str(hmp.common.outbuf));
} else {
output = g_strdup("");
}
}
qemu_mutex_unlock(&hmp.common.mon_lock);
out:
monitor_data_destroy(&hmp.common);
@ -1248,7 +1248,7 @@ void qmp_getfd(const char *fdname, Error **errp)
return;
}
qemu_mutex_lock(&cur_mon->mon_lock);
QEMU_LOCK_GUARD(&cur_mon->mon_lock);
QLIST_FOREACH(monfd, &cur_mon->fds, next) {
if (strcmp(monfd->name, fdname) != 0) {
continue;
@ -1256,7 +1256,6 @@ void qmp_getfd(const char *fdname, Error **errp)
tmp_fd = monfd->fd;
monfd->fd = fd;
qemu_mutex_unlock(&cur_mon->mon_lock);
/* Make sure close() is outside critical section */
close(tmp_fd);
return;
@ -1267,7 +1266,6 @@ void qmp_getfd(const char *fdname, Error **errp)
monfd->fd = fd;
QLIST_INSERT_HEAD(&cur_mon->fds, monfd, next);
qemu_mutex_unlock(&cur_mon->mon_lock);
}
void qmp_closefd(const char *fdname, Error **errp)
@ -1299,7 +1297,7 @@ int monitor_get_fd(Monitor *mon, const char *fdname, Error **errp)
{
mon_fd_t *monfd;
qemu_mutex_lock(&mon->mon_lock);
QEMU_LOCK_GUARD(&mon->mon_lock);
QLIST_FOREACH(monfd, &mon->fds, next) {
int fd;
@ -1313,12 +1311,10 @@ int monitor_get_fd(Monitor *mon, const char *fdname, Error **errp)
QLIST_REMOVE(monfd, next);
g_free(monfd->name);
g_free(monfd);
qemu_mutex_unlock(&mon->mon_lock);
return fd;
}
qemu_mutex_unlock(&mon->mon_lock);
error_setg(errp, "File descriptor named '%s' has not been found", fdname);
return -1;
}
@ -1350,11 +1346,10 @@ void monitor_fdsets_cleanup(void)
MonFdset *mon_fdset;
MonFdset *mon_fdset_next;
qemu_mutex_lock(&mon_fdsets_lock);
QEMU_LOCK_GUARD(&mon_fdsets_lock);
QLIST_FOREACH_SAFE(mon_fdset, &mon_fdsets, next, mon_fdset_next) {
monitor_fdset_cleanup(mon_fdset);
}
qemu_mutex_unlock(&mon_fdsets_lock);
}
AddfdInfo *qmp_add_fd(bool has_fdset_id, int64_t fdset_id, bool has_opaque,
@ -1389,7 +1384,7 @@ void qmp_remove_fd(int64_t fdset_id, bool has_fd, int64_t fd, Error **errp)
MonFdsetFd *mon_fdset_fd;
char fd_str[60];
qemu_mutex_lock(&mon_fdsets_lock);
QEMU_LOCK_GUARD(&mon_fdsets_lock);
QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
if (mon_fdset->id != fdset_id) {
continue;
@ -1409,12 +1404,10 @@ void qmp_remove_fd(int64_t fdset_id, bool has_fd, int64_t fd, Error **errp)
goto error;
}
monitor_fdset_cleanup(mon_fdset);
qemu_mutex_unlock(&mon_fdsets_lock);
return;
}
error:
qemu_mutex_unlock(&mon_fdsets_lock);
if (has_fd) {
snprintf(fd_str, sizeof(fd_str), "fdset-id:%" PRId64 ", fd:%" PRId64,
fdset_id, fd);
@ -1430,7 +1423,7 @@ FdsetInfoList *qmp_query_fdsets(Error **errp)
MonFdsetFd *mon_fdset_fd;
FdsetInfoList *fdset_list = NULL;
qemu_mutex_lock(&mon_fdsets_lock);
QEMU_LOCK_GUARD(&mon_fdsets_lock);
QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
FdsetInfoList *fdset_info = g_malloc0(sizeof(*fdset_info));
FdsetFdInfoList *fdsetfd_list = NULL;
@ -1460,7 +1453,6 @@ FdsetInfoList *qmp_query_fdsets(Error **errp)
fdset_info->next = fdset_list;
fdset_list = fdset_info;
}
qemu_mutex_unlock(&mon_fdsets_lock);
return fdset_list;
}
@ -1554,7 +1546,7 @@ int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags)
#else
MonFdset *mon_fdset;
qemu_mutex_lock(&mon_fdsets_lock);
QEMU_LOCK_GUARD(&mon_fdsets_lock);
QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
MonFdsetFd *mon_fdset_fd;
MonFdsetFd *mon_fdset_fd_dup;
@ -1569,7 +1561,6 @@ int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags)
QLIST_FOREACH(mon_fdset_fd, &mon_fdset->fds, next) {
mon_fd_flags = fcntl(mon_fdset_fd->fd, F_GETFL);
if (mon_fd_flags == -1) {
qemu_mutex_unlock(&mon_fdsets_lock);
return -1;
}
@ -1580,25 +1571,21 @@ int monitor_fdset_dup_fd_add(int64_t fdset_id, int flags)
}
if (fd == -1) {
qemu_mutex_unlock(&mon_fdsets_lock);
errno = EACCES;
return -1;
}
dup_fd = qemu_dup_flags(fd, flags);
if (dup_fd == -1) {
qemu_mutex_unlock(&mon_fdsets_lock);
return -1;
}
mon_fdset_fd_dup = g_malloc0(sizeof(*mon_fdset_fd_dup));
mon_fdset_fd_dup->fd = dup_fd;
QLIST_INSERT_HEAD(&mon_fdset->dup_fds, mon_fdset_fd_dup, next);
qemu_mutex_unlock(&mon_fdsets_lock);
return dup_fd;
}
qemu_mutex_unlock(&mon_fdsets_lock);
errno = ENOENT;
return -1;
#endif
@ -1609,7 +1596,7 @@ static int64_t monitor_fdset_dup_fd_find_remove(int dup_fd, bool remove)
MonFdset *mon_fdset;
MonFdsetFd *mon_fdset_fd_dup;
qemu_mutex_lock(&mon_fdsets_lock);
QEMU_LOCK_GUARD(&mon_fdsets_lock);
QLIST_FOREACH(mon_fdset, &mon_fdsets, next) {
QLIST_FOREACH(mon_fdset_fd_dup, &mon_fdset->dup_fds, next) {
if (mon_fdset_fd_dup->fd == dup_fd) {
@ -1619,17 +1606,14 @@ static int64_t monitor_fdset_dup_fd_find_remove(int dup_fd, bool remove)
if (QLIST_EMPTY(&mon_fdset->dup_fds)) {
monitor_fdset_cleanup(mon_fdset);
}
goto err;
return -1;
} else {
qemu_mutex_unlock(&mon_fdsets_lock);
return mon_fdset->id;
}
}
}
}
err:
qemu_mutex_unlock(&mon_fdsets_lock);
return -1;
}