exit WAIT_FOR_SYSFS if the whole device goes away

Signed-off-by: Kay Sievers <kay.sievers@suse.de>

diff --git a/udev_rules.c b/udev_rules.c
index e9b32df1c66d85a838a311f160ae889955d0f90e..9fa2253e96e59afefc4bce2c73d733ec1583e34c 100644 (file)
--- a/udev_rules.c
+++ b/udev_rules.c
@@ -342,23 +342,33 @@ out:
 #define WAIT_LOOP_PER_SECOND           50
 static int wait_for_sysfs(struct udevice *udev, const char *file, int timeout)
 {
-       char filename[PATH_SIZE];
+       char devicepath[PATH_SIZE];
+       char filepath[PATH_SIZE];
        struct stat stats;
        int loop = timeout * WAIT_LOOP_PER_SECOND;
 
-       snprintf(filename, sizeof(filename), "%s%s/%s", sysfs_path, udev->dev->devpath, file);
-       filename[sizeof(filename)-1] = '\0';
-       dbg("will wait %i sec for '%s'", timeout, filename);
+       strlcpy(devicepath, sysfs_path, sizeof(devicepath));
+       strlcat(devicepath, udev->dev->devpath, sizeof(devicepath));
+       strlcpy(filepath, devicepath, sizeof(filepath));
+       strlcat(filepath, "/", sizeof(filepath));
+       strlcat(filepath, file, sizeof(filepath));
 
+       dbg("will wait %i sec for '%s'", timeout, filepath);
        while (--loop) {
-               if (stat(filename, &stats) == 0) {
-                       info("file '%s' appeared after %i loops", filename, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
+               /* lookup file */
+               if (stat(filepath, &stats) == 0) {
+                       info("file '%s' appeared after %i loops", filepath, (timeout * WAIT_LOOP_PER_SECOND) - loop-1);
                        return 0;
                }
-               info("wait for '%s' for %i mseconds", filename, 1000 / WAIT_LOOP_PER_SECOND);
+               /* make sure the device does not have disappeared in the meantime */
+               if (stat(devicepath, &stats) != 0) {
+                       info("device disappeared while waiting for '%s'", filepath);
+                       return -2;
+               }
+               info("wait for '%s' for %i mseconds", filepath, 1000 / WAIT_LOOP_PER_SECOND);
                usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
        }
-       err("waiting for '%s' failed", filename);
+       err("waiting for '%s' failed", filepath);
        return -1;
 }