[PATCH v3 5/6] vhost: fix and refactor VDUSE reconnect log check

[Maxime Coquelin]

This patch fixes missing error handling in checking the
reconnect log version, and takes the opportunity to move
all the checks into a dedicated function to simply VDUSE
device creation code.

Fixes: da79cc7fda76 ("vhost: add reconnection support to VDUSE")

Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
---
 lib/vhost/vduse.c | 51 ++++++++++++++++++++++++++++-------------------
 1 file changed, 31 insertions(+), 20 deletions(-)

diff --git a/lib/vhost/vduse.c b/lib/vhost/vduse.c
index aae20dfc55..c18692f834 100644
--- a/lib/vhost/vduse.c
+++ b/lib/vhost/vduse.c
@@ -533,6 +533,35 @@ vduse_reconnect_log_map(const char *dev_name, struct 
vhost_reconnect_data **reco
        return ret;
 }
 
+static int
+vduse_reconnect_log_check(struct vhost_reconnect_data *reco_log,
+                         const char *dev_name,
+                         uint64_t features, uint32_t total_queues)
+{
+       if (reco_log->version != VHOST_RECONNECT_VERSION) {
+               VHOST_CONFIG_LOG(dev_name, ERR,
+                               "Version mismatch between backend (0x%x) & 
reconnection file (0x%x)",
+                               VHOST_RECONNECT_VERSION, reco_log->version);
+               return -1;
+       }
+
+       if ((reco_log->features & features) != reco_log->features) {
+               VHOST_CONFIG_LOG(dev_name, ERR,
+                               "Features mismatch between backend (0x%" PRIx64 
") & reconnection file (0x%" PRIx64 ")",
+                               features, reco_log->features);
+               return -1;
+       }
+
+       if (reco_log->nr_vrings != total_queues) {
+               VHOST_CONFIG_LOG(dev_name, ERR,
+                               "Queues number mismatch between backend (%u) 
and reconnection file (%u)",
+                               total_queues, reco_log->nr_vrings);
+               return -1;
+       }
+
+       return 0;
+}
+
 static void
 vduse_reconnect_handler(int fd, void *arg, int *remove)
 {
@@ -648,27 +677,9 @@ vduse_device_create(const char *path, bool 
compliant_ol_flags)
                if (ret < 0)
                        goto out_dev_close;
 
-               if (reconnect_log->version != VHOST_RECONNECT_VERSION) {
-                       VHOST_CONFIG_LOG(name, ERR,
-                                       "Version mismatch between backend 
(0x%x) & reconnection file (0x%x)",
-                                       VHOST_RECONNECT_VERSION, 
reconnect_log->version);
-               }
-
-               if ((reconnect_log->features & features) != 
reconnect_log->features) {
-                       VHOST_CONFIG_LOG(name, ERR,
-                                       "Features mismatch between backend 
(0x%" PRIx64 ") & reconnection file (0x%" PRIx64 ")",
-                                       features, reconnect_log->features);
-                       ret = -1;
-                       goto out_log_unmap;
-               }
-
-               if (reconnect_log->nr_vrings != total_queues) {
-                       VHOST_CONFIG_LOG(name, ERR,
-                                       "Queues number mismatch between backend 
(%u) and reconnection file (%u)",
-                                       total_queues, reconnect_log->nr_vrings);
-                       ret = -1;
+               ret = vduse_reconnect_log_check(reconnect_log, name, features, 
total_queues);
+               if (ret < 0)
                        goto out_log_unmap;
-               }
        } else if (errno == ENOENT) {
                struct vduse_dev_config *dev_config;
 
-- 
2.46.2