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authorkay.sievers@vrfy.org <kay.sievers@vrfy.org>2004-10-18 18:13:13 -0700
committerGreg KH <gregkh@suse.de>2005-04-26 22:02:45 -0700
commitdcb9c852f563ce8c38c3558f8462be2d324c8de7 (patch)
tree802cf3993ffcc3a4e25aeab8bef5c227ac695423 /wait_for_sysfs.c
parent4a330247992f9a558dc3f906be139ff8deddfdc2 (diff)
[PATCH] Fix wait_for_sysfs messages (more debugging info)
On Sat, Oct 16, 2004 at 02:48:42PM -0400, Jeff wrote: > Kay Sievers wrote: > >On Sat, Oct 16, 2004 at 04:40:51AM +0200, Kay Sievers wrote: > > > >Here is a better version. We return successful in the case, that the > >advertised device does not appear within the timeout or goes completely > >away while waiting for the attributes. All magic numbers should be > >readable as a string now. > > > >This hopefully fixes the last vc errors. > > > K, first patch produced a couple of device unavailables & a slew of no > device symlinks. Second patch-no messages at all :) > > Thank god, if I have to reboot again I'm going to puke. Nice to hear that we covered all the vc errors now. I think we should apply the same logic to the /devices device wait loops, as they may go with a remove event too. Here is the 3rd version of the patch :)
Diffstat (limited to 'wait_for_sysfs.c')
-rw-r--r--wait_for_sysfs.c248
1 files changed, 141 insertions, 107 deletions
diff --git a/wait_for_sysfs.c b/wait_for_sysfs.c
index d775eb1c95..aac42e2421 100644
--- a/wait_for_sysfs.c
+++ b/wait_for_sysfs.c
@@ -56,7 +56,8 @@ void log_message(int level, const char *format, ...)
#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 int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
+ const char **error)
{
static struct class_file {
char *subsystem;
@@ -77,7 +78,7 @@ static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev
{ NULL, NULL }
};
struct class_file *classfile;
- const char *file = "dev";
+ char *file = "dev";
char filename[FILENAME_MAX];
int loop;
@@ -103,11 +104,11 @@ static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev
struct stat stats;
if (stat(class_dev->path, &stats) == -1) {
- dbg("oops, the directory '%s' just disappeared.", class_dev->path);
+ dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path);
return -ENODEV;
}
- if (stat(filename, &stats) == 0) {
+ if (stat(filename, &stats) == 0) {
dbg("class '%s' specific file '%s' found", class_dev->classname, file);
return 0;
}
@@ -116,6 +117,7 @@ static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev
}
dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
+ *error = "class specific file unavailable";
return -ENOENT;
}
@@ -226,7 +228,8 @@ static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
}
/* 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 int wait_for_bus_device(struct sysfs_device *devices_dev,
+ const char **error)
{
static struct bus_file {
char *bus;
@@ -246,19 +249,20 @@ static int wait_for_bus_device(struct sysfs_device *device_dev)
struct bus_file *busfile;
int loop;
- /* wait for the /bus-device link to the /device-device */
+ /* wait for the bus device link to the devices device */
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
while (--loop) {
- if (sysfs_get_device_bus(device_dev) == 0)
+ if (sysfs_get_device_bus(devices_dev) == 0)
break;
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
if (loop == 0) {
- dbg("error: getting /bus-device link");
+ dbg("error: getting bus device link");
+ *error = "no bus device link";
return -1;
}
- dbg("/bus-device link found for bus '%s'", device_dev->bus);
+ dbg("bus device link found for bus '%s'", devices_dev->bus);
/* wait for a bus specific file to show up */
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
@@ -266,27 +270,115 @@ static int wait_for_bus_device(struct sysfs_device *device_dev)
int found = 0;
for (busfile = bus_files; busfile->bus != NULL; busfile++) {
- if (strcmp(device_dev->bus, busfile->bus) == 0) {
+ if (strcmp(devices_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);
+ dbg("looking at bus '%s' for specific file '%s'", devices_dev->bus, busfile->file);
+ if (sysfs_get_device_attr(devices_dev, busfile->file) != NULL) {
+ dbg("bus '%s' specific file '%s' found", devices_dev->bus, busfile->file);
return 0;
}
}
}
if (found == 0) {
+ *error = "unknown bus";
info("error: unknown bus, please report to "
- "<linux-hotplug-devel@lists.sourceforge.net> '%s'", device_dev->bus);
+ "<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus);
return -1;
}
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
- dbg("error: getting bus '%s' specific file '%s'", device_dev->bus, busfile->file);
+ dbg("error: getting bus '%s' specific file '%s'", devices_dev->bus, busfile->file);
+ *error = "bus specific file unavailable";
return -1;
}
+
+static struct sysfs_class_device *open_class_device(const char *path)
+{
+ struct sysfs_class_device *class_dev;
+ int loop;
+
+ loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+ while (--loop) {
+ class_dev = sysfs_open_class_device_path(path);
+ if (class_dev)
+ break;
+
+ usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+ }
+
+ return (class_dev);
+}
+
+static int wait_for_class_device(struct sysfs_class_device *class_dev,
+ const char **error)
+{
+ struct sysfs_class_device *class_dev_parent;
+ struct sysfs_device *devices_dev = NULL;
+ int loop;
+
+ if (wait_for_class_device_attributes(class_dev, error) != 0)
+ return -ENOENT;
+
+ /* skip devices without devices-link */
+ if (class_device_expect_no_device_link(class_dev)) {
+ dbg("no device symlink expected for '%s', ", class_dev->name);
+ return -ENODEV;
+ }
+
+ /* the symlink may be on the parent device */
+ class_dev_parent = sysfs_get_classdev_parent(class_dev);
+ if (class_dev_parent)
+ dbg("looking at parent device for device link '%s'", class_dev_parent->path);
+
+ /* wait for the symlink to the devices device */
+ dbg("waiting for symlink to devices device");
+ loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+ while (--loop) {
+ if (class_dev_parent)
+ devices_dev = sysfs_get_classdev_device(class_dev_parent);
+ else
+ devices_dev = sysfs_get_classdev_device(class_dev);
+
+ if (devices_dev)
+ break;
+
+ usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+ }
+ if (!devices_dev) {
+ dbg(" error: no devices device symlink found");
+ *error = "no device symlink";
+ return -ENODEV;
+ }
+ dbg("device symlink found pointing to '%s'", devices_dev->path);
+
+ /* wait for the bus value */
+ if (class_device_expect_no_bus(class_dev)) {
+ dbg("no bus device expected for '%s', ", class_dev->classname);
+ return 0;
+ } else {
+ return wait_for_bus_device(devices_dev, error);
+ }
+}
+
+static struct sysfs_device *open_devices_device(const char *path)
+{
+ struct sysfs_device *devices_dev;
+ int loop;
+
+ loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
+ while (--loop) {
+ devices_dev = sysfs_open_device_path(path);
+ if (devices_dev)
+ break;
+
+ usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
+ }
+
+ return(devices_dev);
+}
+
int main(int argc, char *argv[], char *envp[])
{
const char *devpath = "";
@@ -295,11 +387,9 @@ int main(int argc, char *argv[], char *envp[])
char sysfs_path[SYSFS_PATH_MAX];
char filename[SYSFS_PATH_MAX];
struct sysfs_class_device *class_dev;
- struct sysfs_class_device *class_dev_parent;
- struct sysfs_device *device_dev = NULL;
- int loop;
- int retval;
+ struct sysfs_device *devices_dev;
int rc = 0;
+ const char *error = NULL;
init_logging("wait_for_sysfs");
@@ -312,133 +402,77 @@ int main(int argc, char *argv[], char *envp[])
devpath = getenv ("DEVPATH");
if (!devpath) {
dbg("error: no DEVPATH");
- return 1;
+ rc = 1;
+ goto exit;
}
action = getenv ("ACTION");
if (!action) {
dbg("error: no ACTION");
- return 1;
+ rc = 1;
+ goto exit;
}
/* we only wait on an add event */
- if (strcmp(action, "add") != 0)
- return 0;
+ if (strcmp(action, "add") != 0) {
+ dbg("no add ACTION");
+ goto exit;
+ }
if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
dbg("error: no sysfs path");
- return 2;
+ rc = 2;
+ goto exit;
}
if ((strncmp(devpath, "/block/", 7) == 0) || (strncmp(devpath, "/class/", 7) == 0)) {
- /* open the class device we are called for */
snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
filename[SYSFS_PATH_MAX-1] = '\0';
- loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
- while (--loop) {
- 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 = 3;
+ /* open the class device we are called for */
+ class_dev = open_class_device(filename);
+ if (!class_dev) {
+ dbg("error: class device unavailable (probably remove has beaten us)");
goto exit;
}
- dbg("class_device opened '%s'", filename);
-
- retval = wait_for_class_device_attributes(class_dev);
- if (retval == -ENODEV)
- goto exit_class;
- if (retval != 0) {
- rc = 4;
- goto exit_class;
- }
+ dbg("class device opened '%s'", filename);
- /* skip devices without /device-link */
- if (class_device_expect_no_device_link(class_dev)) {
- dbg("no device symlink expected for '%s', ", class_dev->name);
- goto exit_class;
- }
-
- /* the symlink may be on the parent device */
- class_dev_parent = sysfs_get_classdev_parent(class_dev);
- if (class_dev_parent)
- dbg("looking at parent device for device link '%s'", class_dev_parent->path);
-
- /* wait for the symlink to the /device-device */
- dbg("waiting for symlink to /device-device");
- loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
- while (--loop) {
- if (class_dev_parent)
- device_dev = sysfs_get_classdev_device(class_dev_parent);
- else
- device_dev = sysfs_get_classdev_device(class_dev);
-
- if (device_dev)
- break;
+ /* wait for the class device with possible physical device and bus */
+ wait_for_class_device(class_dev, &error);
- usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
- }
- if (device_dev == NULL) {
- dbg("error: getting /device-device");
- rc = 5;
- goto exit_class;
- }
- dbg("device symlink found pointing to '%s'", device_dev->path);
-
- /* wait for the bus value */
- 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;
- }
-
-exit_class:
sysfs_close_class_device(class_dev);
} else if ((strncmp(devpath, "/devices/", 9) == 0)) {
- /* open the path we are called for */
snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
filename[SYSFS_PATH_MAX-1] = '\0';
- loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
- while (--loop) {
- 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 = 7;
+ /* open the path we are called for */
+ devices_dev = open_devices_device(filename);
+ if (!devices_dev) {
+ dbg("error: devices device unavailable (probably remove has beaten us)");
goto exit;
}
- dbg("device_device opened '%s'", filename);
+ dbg("devices device opened '%s'", filename);
/* wait for the bus value */
- if (wait_for_bus_device(device_dev) != 0)
- rc = 8;
+ wait_for_bus_device(devices_dev, &error);
- sysfs_close_device(device_dev);
+ sysfs_close_device(devices_dev);
} else {
dbg("unhandled sysfs path, no need to wait");
}
exit:
- if (rc == 0)
- dbg("result: waiting for sysfs successful '%s'", devpath);
- else
+ if (error) {
info("either wait_for_sysfs (udev %s) needs an update to handle the device '%s' "
- "properly (%d) or the sysfs-support of your device's driver needs to be fixed, "
+ "properly (%s) or the sysfs-support of your device's driver needs to be fixed, "
"please report to <linux-hotplug-devel@lists.sourceforge.net>",
- UDEV_VERSION, devpath, rc);
+ UDEV_VERSION, devpath, error);
+ rc =3;
+ } else {
+ dbg("result: waiting for sysfs successful '%s'", devpath);
+ }
- return rc;
+ exit(rc);
}