From 21d6220fe0bf24fda7df9833961e022cafa439bc Mon Sep 17 00:00:00 2001
From: Tom Gundersen <teg@jklm.no>
Date: Mon, 27 Jun 2016 09:58:59 +0200
Subject: [PATCH] sd-device: new_from_subsystem_sysnam - support a real
 subsystem called 'drivers'

We support writing out tags and db files in case a real subsystem called
'drivers' exists, so there is no reason to refuse parsing it.
---
 src/libsystemd/sd-device/sd-device.c | 49 +++++++++++++---------------
 1 file changed, 23 insertions(+), 26 deletions(-)

diff --git a/src/libsystemd/sd-device/sd-device.c b/src/libsystemd/sd-device/sd-device.c
index c13f6fca28..d503232505 100644
--- a/src/libsystemd/sd-device/sd-device.c
+++ b/src/libsystemd/sd-device/sd-device.c
@@ -259,7 +259,8 @@ _public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum)
 }
 
 _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *subsystem, const char *sysname) {
-        char *syspath;
+        char *name, *syspath;
+        size_t len = 0;
 
         assert_return(ret, -EINVAL);
         assert_return(subsystem, -EINVAL);
@@ -298,34 +299,30 @@ _public_ int sd_device_new_from_subsystem_sysname(sd_device **ret, const char *s
                         syspath = strjoina("/sys/bus/", subsys, "/drivers/", driver);
                         if (access(syspath, F_OK) >= 0)
                                 return sd_device_new_from_syspath(ret, syspath);
-                } else
-                        return -EINVAL;
-        } else {
-                char *name;
-                size_t len = 0;
-
-                /* translate sysname back to sysfs filename */
-                name = strdupa(sysname);
-                while (name[len] != '\0') {
-                        if (name[len] == '/')
-                                name[len] = '!';
-
-                        len++;
                 }
-
-                syspath = strjoina("/sys/subsystem/", subsystem, "/devices/", name);
-                if (access(syspath, F_OK) >= 0)
-                        return sd_device_new_from_syspath(ret, syspath);
-
-                syspath = strjoina("/sys/bus/", subsystem, "/devices/", name);
-                if (access(syspath, F_OK) >= 0)
-                        return sd_device_new_from_syspath(ret, syspath);
-
-                syspath = strjoina("/sys/class/", subsystem, "/", name);
-                if (access(syspath, F_OK) >= 0)
-                        return sd_device_new_from_syspath(ret, syspath);
         }
 
+        /* translate sysname back to sysfs filename */
+        name = strdupa(sysname);
+        while (name[len] != '\0') {
+                if (name[len] == '/')
+                        name[len] = '!';
+
+                len++;
+        }
+
+        syspath = strjoina("/sys/subsystem/", subsystem, "/devices/", name);
+        if (access(syspath, F_OK) >= 0)
+                return sd_device_new_from_syspath(ret, syspath);
+
+        syspath = strjoina("/sys/bus/", subsystem, "/devices/", name);
+        if (access(syspath, F_OK) >= 0)
+                return sd_device_new_from_syspath(ret, syspath);
+
+        syspath = strjoina("/sys/class/", subsystem, "/", name);
+        if (access(syspath, F_OK) >= 0)
+                return sd_device_new_from_syspath(ret, syspath);
+
         return -ENODEV;
 }