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diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -2435,6 +2435,47 @@
return (retval);
}
+/**
+ * @brief Print the name of the device followed by a colon, a space
+ * and the result of calling log() with the value of @p fmt and
+ * the following arguments.
+ *
+ * @returns the number of characters printed
+ */
+int
+device_log(device_t dev, int pri, const char * fmt, ...)
+{
+ char buf[128];
+ struct sbuf sb;
+ const char *name;
+ va_list ap;
+ size_t retval;
+
+ retval = 0;
+
+ sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
+
+ name = device_get_name(dev);
+
+ if (name == NULL)
+ sbuf_cat(&sb, "unknown: ");
+ else
+ sbuf_printf(&sb, "%s%d: ", name, device_get_unit(dev));
+
+ va_start(ap, fmt);
+ sbuf_vprintf(&sb, fmt, ap);
+ va_end(ap);
+
+ sbuf_finish(&sb);
+
+ log(pri, "%.*s", (int) sbuf_len(&sb), sbuf_data(&sb));
+ retval = sbuf_len(&sb);
+
+ sbuf_delete(&sb);
+
+ return (retval);
+}
+
/**
* @internal
*/
diff --git a/sys/net/if.c b/sys/net/if.c
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -3968,15 +3968,35 @@
strlcpy(ifp->if_xname, name, IFNAMSIZ);
}
+static int
+if_vlog(struct ifnet *ifp, int pri, const char *fmt, va_list ap)
+{
+ char if_fmt[256];
+
+ snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt);
+ vlog(pri, if_fmt, ap);
+ return (0);
+}
+
+
int
if_printf(struct ifnet *ifp, const char *fmt, ...)
{
- char if_fmt[256];
va_list ap;
- snprintf(if_fmt, sizeof(if_fmt), "%s: %s", ifp->if_xname, fmt);
va_start(ap, fmt);
- vlog(LOG_INFO, if_fmt, ap);
+ if_vlog(ifp, LOG_INFO, fmt, ap);
+ va_end(ap);
+ return (0);
+}
+
+int
+if_log(struct ifnet *ifp, int pri, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ if_vlog(ifp, pri, fmt, ap);
va_end(ap);
return (0);
}
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -659,6 +659,7 @@
void if_initname(struct ifnet *, const char *, int);
void if_link_state_change(struct ifnet *, int);
int if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
+int if_log(struct ifnet *, int, const char *, ...) __printflike(3, 4);
void if_ref(struct ifnet *);
void if_rele(struct ifnet *);
bool if_try_ref(struct ifnet *);
diff --git a/sys/sys/bus.h b/sys/sys/bus.h
--- a/sys/sys/bus.h
+++ b/sys/sys/bus.h
@@ -607,6 +607,7 @@
device_t device_lookup_by_name(const char *name);
int device_print_prettyname(device_t dev);
int device_printf(device_t dev, const char *, ...) __printflike(2, 3);
+int device_log(device_t dev, int pri, const char *, ...) __printflike(3, 4);
int device_probe(device_t dev);
int device_probe_and_attach(device_t dev);
int device_probe_child(device_t bus, device_t dev);

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