add OPTIONS+="event_timeout=<seconds>"

test-udev.c

@@ -105,7 +105,7 @@ int main(int argc, char *argv[], char *envp[])
 	sigaction(SIGTERM, &act, NULL);
 
 	/* trigger timeout to prevent hanging processes */
-	alarm(UDEV_ALARM_TIMEOUT);
+	alarm(UDEV_EVENT_TIMEOUT);
 
 	action = getenv("ACTION");
 	devpath = getenv("DEVPATH");
@@ -154,6 +154,10 @@ int main(int argc, char *argv[], char *envp[])
 
 	retval = udev_device_event(&rules, udev);
 
+	/* rules may change/disable the timeout */
+	if (udev->event_timeout >= 0)
+		alarm(udev->event_timeout);
+
 	if (retval == 0 && !udev->ignore_device && udev_run)
 		udev_rules_run(udev);
 

udev.7

@@ -291,6 +291,11 @@ Specify the priority of the created symlinks\. Devices with higher priorities ov
 Create the device nodes for all available partitions of a block device\. This may be useful for removable media devices where media changes are not detected\.
 .RE
 .PP
+\fBevent_timeout=\fR
+.RS 4
+Number of seconds an event will wait for operations to finish, before it will terminate itself\.
+.RE
+.PP
 \fBstring_escape=\fR\fB\fInone|replace\fR\fR
 .RS 4
 Usually control and other possibly unsafe characters are replaced in strings used for device naming\. The mode of replacement can be specified with this option\.

udev.h

@@ -39,7 +39,7 @@
 #define ALLOWED_CHARS_INPUT			ALLOWED_CHARS_FILE " $%?,"
 
 #define DEFAULT_PARTITIONS_COUNT		15
-#define UDEV_ALARM_TIMEOUT			180
+#define UDEV_EVENT_TIMEOUT			180
 
 #define UDEV_MAX(a,b) ((a) > (b) ? (a) : (b))
 
@@ -93,6 +93,7 @@ struct udevice {
 	int ignore_remove;
 	char program_result[PATH_SIZE];
 	int link_priority;
+	int event_timeout;
 	int test_run;
 };
 

udev.xml

@@ -441,6 +441,13 @@
                       detected.</para>
                     </listitem>
                   </varlistentry>
+                  <varlistentry>
+                    <term><option>event_timeout=</option></term>
+                    <listitem>
+                      <para>Number of seconds an event will wait for operations to finish, before it
+                      will terminate itself.</para>
+                    </listitem>
+                  </varlistentry>
                   <varlistentry>
                     <term><option>string_escape=<replaceable>none|replace</replaceable></option></term>
                     <listitem>

udev_device.c

@@ -53,6 +53,8 @@ struct udevice *udev_device_init(struct udevice *udev)
 	strcpy(udev->owner, "root");
 	strcpy(udev->group, "root");
 
+	udev->event_timeout = -1;
+
 	return udev;
 }
 

udev_rules.c

@@ -1397,6 +1397,10 @@ int udev_rules_get_name(struct udev_rules *rules, struct udevice *udev)
 				udev->link_priority = rule->link_priority;
 				info("link_priority=%i\n", udev->link_priority);
 			}
+			if (rule->event_timeout >= 0) {
+				udev->event_timeout = rule->event_timeout;
+				info("event_timeout=%i\n", udev->event_timeout);
+			}
 			/* apply all_partitions option only at a main block device */
 			if (rule->partitions &&
 			    strcmp(udev->dev->subsystem, "block") == 0 && udev->dev->kernel_number[0] == '\0') {

udev_rules.h

@@ -97,6 +97,7 @@ struct udev_rule {
 	enum escape_type string_escape;
 
 	unsigned int link_priority;
+	int event_timeout;
 	unsigned int partitions;
 	unsigned int last_rule:1,
 		     run_ignore_error:1,

udev_rules_parse.c

@@ -245,6 +245,7 @@ static int add_to_rules(struct udev_rules *rules, char *line, const char *filena
 
 	memset(buf, 0x00, sizeof(buf));
 	rule = (struct udev_rule *) buf;
+	rule->event_timeout = -1;
 	linepos = line;
 	valid = 0;
 
@@ -604,6 +605,11 @@ static int add_to_rules(struct udev_rules *rules, char *line, const char *filena
 				rule->link_priority = atoi(&pos[strlen("link_priority=")]);
 				dbg("link priority=%i\n", rule->link_priority);
 			}
+			pos = strstr(value, "event_timeout=");
+			if (pos != NULL) {
+				rule->event_timeout = atoi(&pos[strlen("event_timeout=")]);
+				dbg("event timout=%i\n", rule->event_timeout);
+			}
 			pos = strstr(value, "string_escape=");
 			if (pos != NULL) {
 				pos = &pos[strlen("string_escape=")];

udevd.c

@@ -115,7 +115,7 @@ static int udev_event_process(struct udevd_uevent_msg *msg)
 	sigaction(SIGHUP, &act, NULL);
 
 	/* trigger timeout to prevent hanging processes */
-	alarm(UDEV_ALARM_TIMEOUT);
+	alarm(UDEV_EVENT_TIMEOUT);
 
 	/* reconstruct event environment from message */
 	for (i = 0; msg->envp[i]; i++)
@@ -131,6 +131,10 @@ static int udev_event_process(struct udevd_uevent_msg *msg)
 
 	retval = udev_device_event(&rules, udev);
 
+	/* rules may change/disable the timeout */
+	if (udev->event_timeout >= 0)
+		alarm(udev->event_timeout);
+
 	/* run programs collected by RUN-key*/
 	if (retval == 0 && !udev->ignore_device && udev_run)
 		retval = udev_rules_run(udev);

udevtest.c

@@ -183,6 +183,10 @@ int udevtest(int argc, char *argv[], char *envp[])
 
 	info("looking at device '%s' from subsystem '%s'\n", udev->dev->devpath, udev->dev->subsystem);
 	retval = udev_device_event(&rules, udev);
+
+	if (udev->event_timeout >= 0)
+		info("custom event timeout: %i\n", udev->event_timeout);
+
 	if (retval == 0 && !udev->ignore_device && udev_run) {
 		struct name_entry *name_loop;