chiark / gitweb /
[PATCH] wait_for_sysfs debug cleanup
authorkay.sievers@vrfy.org <kay.sievers@vrfy.org>
Thu, 7 Oct 2004 06:45:30 +0000 (23:45 -0700)
committerGreg KH <gregkh@suse.de>
Wed, 27 Apr 2005 04:37:03 +0000 (21:37 -0700)
> Sorry, I left my debug code in.

Oops, just realized it now. You've applied a older version and not the
latest. Here is a new patch to catch up.

Makefile
wait_for_sysfs.c

index 1b7c71c..0b635ff 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -399,7 +399,7 @@ install: install-initscript install-config install-man install-dev.d all
        $(INSTALL_PROGRAM) -D $(WAIT) $(DESTDIR)$(sbindir)/$(WAIT)
        - ln -f -s $(sbindir)/udev $(DESTDIR)$(sbindir)/$(STARTER)
        - ln -f -s $(sbindir)/$(SENDER) $(DESTDIR)$(hotplugdir)/10-udev.hotplug
-       - ln -f -s $(sbindir)/$(WAIT) $(DESTDIR)$(hotplugdir)/00-wait_for_sysfs.hotplug
+       - ln -f -s $(sbindir)/$(WAIT) $(DESTDIR)$(hotplugdir)/05-wait_for_sysfs.hotplug
 ifndef DESTDIR
        - killall udevd
        - rm -f $(udevdir)/.udev.tdb
@@ -412,7 +412,7 @@ endif
 
 uninstall: uninstall-man uninstall-dev.d
        - rm $(hotplugdir)/10-udev.hotplug
-       - rm $(hotplugdir)/00-wait_for_sysfs.hotplug
+       - rm $(hotplugdir)/05-wait_for_sysfs.hotplug
        - rm $(configdir)/rules.d/50-udev.rules
        - rm $(configdir)/permissions.d/50-udev.permissions
        - rm $(configdir)/udev.conf
index b9efcdd..6275db2 100644 (file)
@@ -1,7 +1,7 @@
 /*
  * wait_for_sysfs.c  - small program to delay the execution
  *                    of /etc/hotplug.d/ programs, until sysfs
- *                    is populated by the kernel. Depending on
+ *                    is fully populated by the kernel. Depending on
  *                    the type of device, we wait for all expected
  *                    directories and then just exit.
  *
@@ -49,6 +49,7 @@ void log_message(int level, const char *format, ...)
 #define WAIT_MAX_SECONDS               5
 #define WAIT_LOOP_PER_SECOND           20
 
+/* wait for specific file to show up, normally the "dev"-file */
 static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev)
 {
        static struct class_file {
@@ -56,8 +57,10 @@ static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev
                char *file;
        } class_files[] = {
                { .subsystem = "net",           .file = "ifindex" },
+               { .subsystem = "scsi_host",     .file = "unique_id" },
+               { .subsystem = "scsi_device",   .file = NULL },
+               { .subsystem = "pcmcia_socket", .file = "card_type" },
                { .subsystem = "usb_host",      .file = NULL },
-               { .subsystem = "pcmcia_socket", .file = NULL },
                { NULL, NULL }
        };
        struct class_file *classfile;
@@ -83,16 +86,17 @@ static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev
                        dbg("class '%s' specific file '%s' found", class_dev->classname, file);
                        return 0;
                }
+
+               usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
        }
 
-       dbg("error: getting bus '%s' specific file '%s'", class_dev->classname, file);
+       dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
        return -1;
 }
 
+/* skip waiting for physical device */
 static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
 {
-       char **device;
-
        static char *devices_without_link[] = {
                "nb",
                "ram",
@@ -120,6 +124,7 @@ static int class_device_expect_no_device_link(struct sysfs_class_device *class_d
                "ttyS",
                NULL
        };
+       char **device;
 
        for (device = devices_without_link; *device != NULL; device++) {
                int len = strlen(*device);
@@ -140,6 +145,26 @@ static int class_device_expect_no_device_link(struct sysfs_class_device *class_d
        return 0;
 }
 
+/* skip waiting for the bus */
+static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
+{
+       static char *devices_without_bus[] = {
+               "scsi_host",
+               NULL
+       };
+       char **device;
+
+       for (device = devices_without_bus; *device != NULL; device++) {
+               int len = strlen(*device);
+
+               if (strncmp(class_dev->classname, *device, len) == 0)
+                       return 1;
+       }
+
+       return 0;
+}
+
+/* wait for the bus and for a bus specific file to show up */
 static int wait_for_bus_device(struct sysfs_device *device_dev)
 {
        static struct bus_file {
@@ -152,6 +177,7 @@ static int wait_for_bus_device(struct sysfs_device *device_dev)
                { .bus = "usb-serial",  .file = "detach_state" },
                { .bus = "ide",         .file = "detach_state" },
                { .bus = "pci",         .file = "vendor" },
+               { .bus = "platform",    .file = "detach_state" },
                { NULL }
        };
        struct bus_file *busfile;
@@ -174,19 +200,24 @@ static int wait_for_bus_device(struct sysfs_device *device_dev)
        /* wait for a bus specific file to show up */
        loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
        while (--loop) {
+               int found = 0;
+
                for (busfile = bus_files; busfile->bus != NULL; busfile++) {
                        if (strcmp(device_dev->bus, busfile->bus) == 0) {
+                               found = 1;
                                dbg("looking at bus '%s' for specific file '%s'", device_dev->bus, busfile->file);
                                if (sysfs_get_device_attr(device_dev, busfile->file) != NULL) {
                                        dbg("bus '%s' specific file '%s' found", device_dev->bus, busfile->file);
                                        return 0;
                                }
-                               if (busfile->bus == NULL) {
-                                       info("error: unknown bus, update the build-in list '%s'", device_dev->bus);
-                                       return -1;
-                               }
                        }
                }
+               if (found == 0) {
+                       info("error: unknown bus, please report to "
+                            "<linux-hotplug-devel@lists.sourceforge.net> '%s'", device_dev->bus);
+                       return -1;
+               }
+               usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
        }
 
        dbg("error: getting bus '%s' specific file '%s'", device_dev->bus, busfile->file);
@@ -206,6 +237,8 @@ int main(int argc, char *argv[], char *envp[])
        int loop;
        int rc = 0;
 
+       init_logging("wait_for_sysfs");
+
        if (argc != 2) {
                dbg("error: subsystem");
                return 1;
@@ -224,6 +257,7 @@ int main(int argc, char *argv[], char *envp[])
                return 1;
        }
 
+       /* we only wait on an add event */
        if (strcmp(action, "add") != 0)
                return 0;
 
@@ -242,20 +276,25 @@ int main(int argc, char *argv[], char *envp[])
                        class_dev = sysfs_open_class_device_path(filename);
                        if (class_dev)
                                break;
+
+                       usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
                }
                if (class_dev == NULL) {
                        dbg("error: getting class_device");
-                       rc = 4;
+                       rc = 3;
                        goto exit;
                }
                dbg("class_device opened '%s'", filename);
 
-               wait_for_class_device_attributes(class_dev);
+               if (wait_for_class_device_attributes(class_dev) != 0) {
+                       rc = 4;
+                       goto exit_class;
+               }
 
+               /* skip devices without /device-link */
                if (class_device_expect_no_device_link(class_dev)) {
-                       dbg("no device symlink expected");
-                       sysfs_close_class_device(class_dev);
-                       goto exit;
+                       dbg("no device symlink expected for '%s', ", class_dev->name);
+                       goto exit_class;
                }
 
                /* the symlink may be on the parent device */
@@ -279,19 +318,21 @@ int main(int argc, char *argv[], char *envp[])
                }
                if (device_dev == NULL) {
                        dbg("error: getting /device-device");
-                       sysfs_close_class_device(class_dev);
                        rc = 5;
-                       goto exit;
+                       goto exit_class;
                }
                dbg("device symlink found pointing to '%s'", device_dev->path);
 
                /* wait for the bus value */
-               if (wait_for_bus_device(device_dev) != 0)
-                       rc = 6;
-               sysfs_close_class_device(class_dev);
+               if (class_device_expect_no_bus(class_dev)) {
+                       dbg("no bus device expected for '%s', ", class_dev->classname);
+               } else {
+                       if (wait_for_bus_device(device_dev) != 0)
+                               rc = 6;
+               }
 
-               /* finished */
-               goto exit;
+exit_class:
+               sysfs_close_class_device(class_dev);
 
        } else if ((strncmp(devpath, "/devices/", 9) == 0)) {
                /* open the path we are called for */
@@ -303,32 +344,33 @@ int main(int argc, char *argv[], char *envp[])
                        device_dev = sysfs_open_device_path(filename);
                        if (device_dev)
                                break;
+
+                       usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
                }
                if (device_dev == NULL) {
                        dbg("error: getting /device-device");
-                       rc = 4;
+                       rc = 7;
                        goto exit;
                }
                dbg("device_device opened '%s'", filename);
 
                /* wait for the bus value */
                if (wait_for_bus_device(device_dev) != 0)
-                       rc = 9;
+                       rc = 8;
 
                sysfs_close_device(device_dev);
 
-               /* finished */
-               goto exit;
-
        } else {
                dbg("unhandled sysfs path, no need to wait");
        }
 
 exit:
        if (rc == 0)
-               info("result: waiting for sysfs successful '%s'", devpath);
+               dbg("result: waiting for sysfs successful '%s'", devpath);
        else
-               info("result: waiting for sysfs failed '%s'", devpath);
+               info("error: wait_for_sysfs needs an update to handle the device '%s' "
+                    "properly, please report to <linux-hotplug-devel@lists.sourceforge.net>",
+                    devpath);
 
        return rc;
 }