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mdev: fix subsystem passing (new kernels broke it again) - bugs 639, 721.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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bf1d347964
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@ -66,9 +66,6 @@ struct globals {
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char *subsystem;
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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#define root_major (G.root_major)
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#define root_minor (G.root_minor)
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#define subsystem (G.subsystem )
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/* Prevent infinite loops in /sys symlinks */
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#define MAX_SYSFS_DEPTH 3
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@ -109,7 +106,7 @@ static char *build_alias(char *alias, const char *device_name)
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*/
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static void make_device(char *path, int delete)
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{
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char *device_name;
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char *device_name, *subsystem_slash_devname;
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int major, minor, type, len;
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mode_t mode;
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parser_t *parser;
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@ -140,17 +137,29 @@ static void make_device(char *path, int delete)
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device_name = (char*) bb_basename(path);
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/* http://kernel.org/doc/pending/hotplug.txt says that only
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* "/sys/block/..." is for block devices. "/sys/bus" etc is not.
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* But since 2.6.25 block devices are also in /sys/class/block,
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* we use strstr("/block/") to forestall future surprises. */
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* But since 2.6.25 block devices are also in /sys/class/block.
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* We use strstr("/block/") to forestall future surprises. */
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type = S_IFCHR;
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if (strstr(path, "/block/"))
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if (strstr(path, "/block/") || strncmp(G.subsystem, "block", 5) == 0)
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type = S_IFBLK;
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/* Make path point to "subsystem/device_name" */
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if (path[5] == 'b') /* legacy /sys/block? */
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subsystem_slash_devname = NULL;
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/* Check for coldplug invocations first */
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if (strncmp(path, "/sys/block/", 11) == 0) /* legacy case */
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path += sizeof("/sys/") - 1;
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else
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else if (strncmp(path, "/sys/class/", 11) == 0)
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path += sizeof("/sys/class/") - 1;
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else {
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/* Example of a hotplug invocation:
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* SUBSYSTEM="block"
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* DEVPATH="/sys" + "/devices/virtual/mtd/mtd3/mtdblock3"
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* ("/sys" is added by mdev_main)
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* - path does not contain subsystem
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*/
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subsystem_slash_devname = concat_path_file(G.subsystem, device_name);
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path = subsystem_slash_devname;
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}
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/* If we have config file, look up user settings */
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if (ENABLE_FEATURE_MDEV_CONF)
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@ -332,7 +341,7 @@ static void make_device(char *path, int delete)
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if (!delete && major >= 0) {
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if (mknod(node_name, mode | type, makedev(major, minor)) && errno != EEXIST)
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bb_perror_msg("can't create %s", node_name);
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if (major == root_major && minor == root_minor)
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if (major == G.root_major && minor == G.root_minor)
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symlink(node_name, "root");
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if (ENABLE_FEATURE_MDEV_CONF) {
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chmod(node_name, mode);
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@ -347,7 +356,7 @@ static void make_device(char *path, int delete)
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if (ENABLE_FEATURE_MDEV_EXEC && command) {
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/* setenv will leak memory, use putenv/unsetenv/free */
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char *s = xasprintf("%s=%s", "MDEV", node_name);
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char *s1 = xasprintf("%s=%s", "SUBSYSTEM", subsystem);
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char *s1 = xasprintf("%s=%s", "SUBSYSTEM", G.subsystem);
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putenv(s);
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putenv(s1);
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if (system(command) == -1)
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@ -381,6 +390,7 @@ static void make_device(char *path, int delete)
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if (ENABLE_FEATURE_MDEV_CONF)
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config_close(parser);
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free(subsystem_slash_devname);
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}
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/* File callback for /sys/ traversal */
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@ -398,7 +408,7 @@ static int FAST_FUNC fileAction(const char *fileName,
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strcpy(scratch, fileName);
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scratch[len] = '\0';
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make_device(scratch, 0);
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make_device(scratch, /*delete:*/ 0);
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return TRUE;
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}
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@ -412,10 +422,10 @@ static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
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/* Extract device subsystem -- the name of the directory
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* under /sys/class/ */
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if (1 == depth) {
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free(subsystem);
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subsystem = strrchr(fileName, '/');
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if (subsystem)
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subsystem = xstrdup(subsystem + 1);
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free(G.subsystem);
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G.subsystem = strrchr(fileName, '/');
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if (G.subsystem)
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G.subsystem = xstrdup(G.subsystem + 1);
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}
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return (depth >= MAX_SYSFS_DEPTH ? SKIP : TRUE);
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@ -500,8 +510,8 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
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struct stat st;
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xstat("/", &st);
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root_major = major(st.st_dev);
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root_minor = minor(st.st_dev);
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G.root_major = major(st.st_dev);
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G.root_minor = minor(st.st_dev);
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/* ACTION_FOLLOWLINKS is needed since in newer kernels
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* /sys/block/loop* (for example) are symlinks to dirs,
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@ -538,8 +548,8 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
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*/
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action = getenv("ACTION");
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env_path = getenv("DEVPATH");
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subsystem = getenv("SUBSYSTEM");
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if (!action || !env_path /*|| !subsystem*/)
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G.subsystem = getenv("SUBSYSTEM");
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if (!action || !env_path /*|| !G.subsystem*/)
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bb_show_usage();
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fw = getenv("FIRMWARE");
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op = index_in_strings(keywords, action);
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@ -574,10 +584,10 @@ int mdev_main(int argc UNUSED_PARAM, char **argv)
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* to happen and to cause erroneous deletion
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* of device nodes. */
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if (!fw)
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make_device(temp, 1);
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make_device(temp, /*delete:*/ 1);
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}
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else if (op == OP_add) {
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make_device(temp, 0);
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make_device(temp, /*delete:*/ 0);
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if (ENABLE_FEATURE_MDEV_LOAD_FIRMWARE) {
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if (fw)
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load_firmware(fw, temp);
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