Merge tag 'driver-core-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core patches for 3.4-rc1 from Greg KH:
 "Here's the big driver core merge for 3.4-rc1.

  Lots of various things here, sysfs fixes/tweaks (with the nlink
  breakage reverted), dynamic debugging updates, w1 drivers, hyperv
  driver updates, and a variety of other bits and pieces, full
  information in the shortlog."

* tag 'driver-core-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (78 commits)
  Tools: hv: Support enumeration from all the pools
  Tools: hv: Fully support the new KVP verbs in the user level daemon
  Drivers: hv: Support the newly introduced KVP messages in the driver
  Drivers: hv: Add new message types to enhance KVP
  regulator: Support driver probe deferral
  Revert "sysfs: Kill nlink counting."
  uevent: send events in correct order according to seqnum (v3)
  driver core: minor comment formatting cleanups
  driver core: move the deferred probe pointer into the private area
  drivercore: Add driver probe deferral mechanism
  DS2781 Maxim Stand-Alone Fuel Gauge battery and w1 slave drivers
  w1_bq27000: Only one thread can access the bq27000 at a time.
  w1_bq27000 - remove w1_bq27000_write
  w1_bq27000: remove unnecessary NULL test.
  sysfs: Fix memory leak in sysfs_sd_setsecdata().
  intel_idle: Revert change of auto_demotion_disable_flags for Nehalem
  w1: Fix w1_bq27000
  driver-core: documentation: fix up Greg's email address
  powernow-k6: Really enable auto-loading
  powernow-k7: Fix CPU family number
  ...

3 files changed, 197 insertions, 95 deletions

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index fea790a2b176..13ef2338be41 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -170,7 +170,7 @@ static bool driver_filter(struct device *dev)
                 return false;
 
         /* driver filter on but not yet initialized */
-        drv = get_driver(dev->driver);
+        drv = dev->driver;
         if (!drv)
                 return false;
 
@@ -185,7 +185,6 @@ static bool driver_filter(struct device *dev)
         }
 
         read_unlock_irqrestore(&driver_name_lock, flags);
-        put_driver(drv);
 
         return ret;
 }
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index dcdade39e47f..310c753cf83e 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -60,6 +60,7 @@ struct ddebug_iter {
 static DEFINE_MUTEX(ddebug_lock);
 static LIST_HEAD(ddebug_tables);
 static int verbose = 0;
+module_param(verbose, int, 0644);
 
 /* Return the last part of a pathname */
 static inline const char *basename(const char *path)
@@ -68,12 +69,24 @@ static inline const char *basename(const char *path)
         return tail ? tail+1 : path;
 }
 
+/* Return the path relative to source root */
+static inline const char *trim_prefix(const char *path)
+{
+        int skip = strlen(__FILE__) - strlen("lib/dynamic_debug.c");
+
+        if (strncmp(path, __FILE__, skip))
+                skip = 0; /* prefix mismatch, don't skip */
+
+        return path + skip;
+}
+
 static struct { unsigned flag:8; char opt_char; } opt_array[] = {
         { _DPRINTK_FLAGS_PRINT, 'p' },
         { _DPRINTK_FLAGS_INCL_MODNAME, 'm' },
         { _DPRINTK_FLAGS_INCL_FUNCNAME, 'f' },
         { _DPRINTK_FLAGS_INCL_LINENO, 'l' },
         { _DPRINTK_FLAGS_INCL_TID, 't' },
+        { _DPRINTK_FLAGS_NONE, '_' },
 };
 
 /* format a string into buf[] which describes the _ddebug's flags */
@@ -83,58 +96,74 @@ static char *ddebug_describe_flags(struct _ddebug *dp, char *buf,
         char *p = buf;
         int i;
 
-        BUG_ON(maxlen < 4);
+        BUG_ON(maxlen < 6);
         for (i = 0; i < ARRAY_SIZE(opt_array); ++i)
                 if (dp->flags & opt_array[i].flag)
                         *p++ = opt_array[i].opt_char;
         if (p == buf)
-                *p++ = '-';
+                *p++ = '_';
         *p = '\0';
 
         return buf;
 }
 
+#define vpr_info_dq(q, msg)                                             \
+do {                                                                    \
+        if (verbose)                                                    \
+                /* trim last char off format print */                   \
+                pr_info("%s: func=\"%s\" file=\"%s\" "                  \
+                        "module=\"%s\" format=\"%.*s\" "                \
+                        "lineno=%u-%u",                                 \
+                        msg,                                            \
+                        q->function ? q->function : "",                 \
+                        q->filename ? q->filename : "",                 \
+                        q->module ? q->module : "",                     \
+                        (int)(q->format ? strlen(q->format) - 1 : 0),   \
+                        q->format ? q->format : "",                     \
+                        q->first_lineno, q->last_lineno);               \
+} while (0)
+
 /*
- * Search the tables for _ddebug's which match the given
- * `query' and apply the `flags' and `mask' to them.  Tells
- * the user which ddebug's were changed, or whether none
- * were matched.
+ * Search the tables for _ddebug's which match the given `query' and
+ * apply the `flags' and `mask' to them.  Returns number of matching
+ * callsites, normally the same as number of changes.  If verbose,
+ * logs the changes.  Takes ddebug_lock.
  */
-static void ddebug_change(const struct ddebug_query *query,
-                           unsigned int flags, unsigned int mask)
+static int ddebug_change(const struct ddebug_query *query,
+                        unsigned int flags, unsigned int mask)
 {
         int i;
         struct ddebug_table *dt;
         unsigned int newflags;
         unsigned int nfound = 0;
-        char flagbuf[8];
+        char flagbuf[10];
 
         /* search for matching ddebugs */
         mutex_lock(&ddebug_lock);
         list_for_each_entry(dt, &ddebug_tables, link) {
 
                 /* match against the module name */
-                if (query->module != NULL &&
-                    strcmp(query->module, dt->mod_name))
+                if (query->module && strcmp(query->module, dt->mod_name))
                         continue;
 
                 for (i = 0 ; i < dt->num_ddebugs ; i++) {
                         struct _ddebug *dp = &dt->ddebugs[i];
 
                         /* match against the source filename */
-                        if (query->filename != NULL &&
+                        if (query->filename &&
                             strcmp(query->filename, dp->filename) &&
-                            strcmp(query->filename, basename(dp->filename)))
+                            strcmp(query->filename, basename(dp->filename)) &&
+                            strcmp(query->filename, trim_prefix(dp->filename)))
                                 continue;
 
                         /* match against the function */
-                        if (query->function != NULL &&
+                        if (query->function &&
                             strcmp(query->function, dp->function))
                                 continue;
 
                         /* match against the format */
-                        if (query->format != NULL &&
-                            strstr(dp->format, query->format) == NULL)
+                        if (query->format &&
+                            !strstr(dp->format, query->format))
                                 continue;
 
                         /* match against the line number range */
@@ -151,13 +180,9 @@ static void ddebug_change(const struct ddebug_query *query,
                         if (newflags == dp->flags)
                                 continue;
                         dp->flags = newflags;
-                        if (newflags)
-                                dp->enabled = 1;
-                        else
-                                dp->enabled = 0;
                         if (verbose)
-                                pr_info("changed %s:%d [%s]%s %s\n",
-                                        dp->filename, dp->lineno,
+                                pr_info("changed %s:%d [%s]%s =%s\n",
+                                        trim_prefix(dp->filename), dp->lineno,
                                         dt->mod_name, dp->function,
                                         ddebug_describe_flags(dp, flagbuf,
                                                         sizeof(flagbuf)));
@@ -167,6 +192,8 @@ static void ddebug_change(const struct ddebug_query *query,
 
         if (!nfound && verbose)
                 pr_info("no matches for query\n");
+
+        return nfound;
 }
 
 /*
@@ -186,8 +213,10 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
                 buf = skip_spaces(buf);
                 if (!*buf)
                         break;  /* oh, it was trailing whitespace */
+                if (*buf == '#')
+                        break;  /* token starts comment, skip rest of line */
 
-                /* Run `end' over a word, either whitespace separated or quoted */
+                /* find `end' of word, whitespace separated or quoted */
                 if (*buf == '"' || *buf == '\'') {
                         int quote = *buf++;
                         for (end = buf ; *end && *end != quote ; end++)
@@ -199,8 +228,8 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
                                 ;
                         BUG_ON(end == buf);
                 }
-                /* Here `buf' is the start of the word, `end' is one past the end */
 
+                /* `buf' is start of word, `end' is one past its end */
                 if (nwords == maxwords)
                         return -EINVAL; /* ran out of words[] before bytes */
                 if (*end)
@@ -279,6 +308,19 @@ static char *unescape(char *str)
         return str;
 }
 
+static int check_set(const char **dest, char *src, char *name)
+{
+        int rc = 0;
+
+        if (*dest) {
+                rc = -EINVAL;
+                pr_err("match-spec:%s val:%s overridden by %s",
+                        name, *dest, src);
+        }
+        *dest = src;
+        return rc;
+}
+
 /*
  * Parse words[] as a ddebug query specification, which is a series
  * of (keyword, value) pairs chosen from these possibilities:
@@ -290,11 +332,15 @@ static char *unescape(char *str)
  * format <escaped-string-to-find-in-format>
  * line <lineno>
  * line <first-lineno>-<last-lineno> // where either may be empty
+ *
+ * Only 1 of each type is allowed.
+ * Returns 0 on success, <0 on error.
  */
 static int ddebug_parse_query(char *words[], int nwords,
                                struct ddebug_query *query)
 {
         unsigned int i;
+        int rc;
 
         /* check we have an even number of words */
         if (nwords % 2 != 0)
@@ -303,41 +349,43 @@ static int ddebug_parse_query(char *words[], int nwords,
 
         for (i = 0 ; i < nwords ; i += 2) {
                 if (!strcmp(words[i], "func"))
-                        query->function = words[i+1];
+                        rc = check_set(&query->function, words[i+1], "func");
                 else if (!strcmp(words[i], "file"))
-                        query->filename = words[i+1];
+                        rc = check_set(&query->filename, words[i+1], "file");
                 else if (!strcmp(words[i], "module"))
-                        query->module = words[i+1];
+                        rc = check_set(&query->module, words[i+1], "module");
                 else if (!strcmp(words[i], "format"))
-                        query->format = unescape(words[i+1]);
+                        rc = check_set(&query->format, unescape(words[i+1]),
+                                "format");
                 else if (!strcmp(words[i], "line")) {
                         char *first = words[i+1];
                         char *last = strchr(first, '-');
+                        if (query->first_lineno || query->last_lineno) {
+                                pr_err("match-spec:line given 2 times\n");
+                                return -EINVAL;
+                        }
                         if (last)
                                 *last++ = '\0';
                         if (parse_lineno(first, &query->first_lineno) < 0)
                                 return -EINVAL;
-                        if (last != NULL) {
+                        if (last) {
                                 /* range <first>-<last> */
-                                if (parse_lineno(last, &query->last_lineno) < 0)
+                                if (parse_lineno(last, &query->last_lineno)
+                                    < query->first_lineno) {
+                                        pr_err("last-line < 1st-line\n");
                                         return -EINVAL;
+                                }
                         } else {
                                 query->last_lineno = query->first_lineno;
                         }
                 } else {
-                        if (verbose)
-                                pr_err("unknown keyword \"%s\"\n", words[i]);
+                        pr_err("unknown keyword \"%s\"\n", words[i]);
                         return -EINVAL;
                 }
+                if (rc)
+                        return rc;
         }
-
-        if (verbose)
-                pr_info("q->function=\"%s\" q->filename=\"%s\" "
-                        "q->module=\"%s\" q->format=\"%s\" q->lineno=%u-%u\n",
-                        query->function, query->filename,
-                        query->module, query->format, query->first_lineno,
-                        query->last_lineno);
-
+        vpr_info_dq(query, "parsed");
         return 0;
 }
 
@@ -375,8 +423,6 @@ static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
                 if (i < 0)
                         return -EINVAL;
         }
-        if (flags == 0)
-                return -EINVAL;
         if (verbose)
                 pr_info("flags=0x%x\n", flags);
 
@@ -405,7 +451,7 @@ static int ddebug_exec_query(char *query_string)
         unsigned int flags = 0, mask = 0;
         struct ddebug_query query;
 #define MAXWORDS 9
-        int nwords;
+        int nwords, nfound;
         char *words[MAXWORDS];
 
         nwords = ddebug_tokenize(query_string, words, MAXWORDS);
@@ -417,8 +463,47 @@ static int ddebug_exec_query(char *query_string)
                 return -EINVAL;
 
         /* actually go and implement the change */
-        ddebug_change(&query, flags, mask);
-        return 0;
+        nfound = ddebug_change(&query, flags, mask);
+        vpr_info_dq((&query), (nfound) ? "applied" : "no-match");
+
+        return nfound;
+}
+
+/* handle multiple queries in query string, continue on error, return
+   last error or number of matching callsites.  Module name is either
+   in param (for boot arg) or perhaps in query string.
+*/
+static int ddebug_exec_queries(char *query)
+{
+        char *split;
+        int i, errs = 0, exitcode = 0, rc, nfound = 0;
+
+        for (i = 0; query; query = split) {
+                split = strpbrk(query, ";\n");
+                if (split)
+                        *split++ = '\0';
+
+                query = skip_spaces(query);
+                if (!query || !*query || *query == '#')
+                        continue;
+
+                if (verbose)
+                        pr_info("query %d: \"%s\"\n", i, query);
+
+                rc = ddebug_exec_query(query);
+                if (rc < 0) {
+                        errs++;
+                        exitcode = rc;
+                } else
+                        nfound += rc;
+                i++;
+        }
+        pr_info("processed %d queries, with %d matches, %d errs\n",
+                 i, nfound, errs);
+
+        if (exitcode)
+                return exitcode;
+        return nfound;
 }
 
 #define PREFIX_SIZE 64
@@ -452,7 +537,8 @@ static char *dynamic_emit_prefix(const struct _ddebug *desc, char *buf)
                 pos += snprintf(buf + pos, remaining(pos), "%s:",
                                         desc->function);
         if (desc->flags & _DPRINTK_FLAGS_INCL_LINENO)
-                pos += snprintf(buf + pos, remaining(pos), "%d:", desc->lineno);
+                pos += snprintf(buf + pos, remaining(pos), "%d:",
+                                        desc->lineno);
         if (pos - pos_after_tid)
                 pos += snprintf(buf + pos, remaining(pos), " ");
         if (pos >= PREFIX_SIZE)
@@ -527,14 +613,16 @@ EXPORT_SYMBOL(__dynamic_netdev_dbg);
 
 #endif
 
-static __initdata char ddebug_setup_string[1024];
+#define DDEBUG_STRING_SIZE 1024
+static __initdata char ddebug_setup_string[DDEBUG_STRING_SIZE];
+
 static __init int ddebug_setup_query(char *str)
 {
-        if (strlen(str) >= 1024) {
+        if (strlen(str) >= DDEBUG_STRING_SIZE) {
                 pr_warn("ddebug boot param string too large\n");
                 return 0;
         }
-        strcpy(ddebug_setup_string, str);
+        strlcpy(ddebug_setup_string, str, DDEBUG_STRING_SIZE);
         return 1;
 }
 
@@ -544,25 +632,33 @@ __setup("ddebug_query=", ddebug_setup_query);
  * File_ops->write method for <debugfs>/dynamic_debug/conrol.  Gathers the
  * command text from userspace, parses and executes it.
  */
+#define USER_BUF_PAGE 4096
 static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
                                   size_t len, loff_t *offp)
 {
-        char tmpbuf[256];
+        char *tmpbuf;
         int ret;
 
         if (len == 0)
                 return 0;
-        /* we don't check *offp -- multiple writes() are allowed */
-        if (len > sizeof(tmpbuf)-1)
+        if (len > USER_BUF_PAGE - 1) {
+                pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
                 return -E2BIG;
-        if (copy_from_user(tmpbuf, ubuf, len))
+        }
+        tmpbuf = kmalloc(len + 1, GFP_KERNEL);
+        if (!tmpbuf)
+                return -ENOMEM;
+        if (copy_from_user(tmpbuf, ubuf, len)) {
+                kfree(tmpbuf);
                 return -EFAULT;
+        }
         tmpbuf[len] = '\0';
         if (verbose)
                 pr_info("read %d bytes from userspace\n", (int)len);
 
-        ret = ddebug_exec_query(tmpbuf);
-        if (ret)
+        ret = ddebug_exec_queries(tmpbuf);
+        kfree(tmpbuf);
+        if (ret < 0)
                 return ret;
 
         *offp += len;
@@ -668,7 +764,7 @@ static int ddebug_proc_show(struct seq_file *m, void *p)
 {
         struct ddebug_iter *iter = m->private;
         struct _ddebug *dp = p;
-        char flagsbuf[8];
+        char flagsbuf[10];
 
         if (verbose)
                 pr_info("called m=%p p=%p\n", m, p);
@@ -679,10 +775,10 @@ static int ddebug_proc_show(struct seq_file *m, void *p)
                 return 0;
         }
 
-        seq_printf(m, "%s:%u [%s]%s %s \"",
-                   dp->filename, dp->lineno,
-                   iter->table->mod_name, dp->function,
-                   ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf)));
+        seq_printf(m, "%s:%u [%s]%s =%s \"",
+                trim_prefix(dp->filename), dp->lineno,
+                iter->table->mod_name, dp->function,
+                ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf)));
         seq_escape(m, dp->format, "\t\r\n\"");
         seq_puts(m, "\"\n");
 
@@ -708,10 +804,11 @@ static const struct seq_operations ddebug_proc_seqops = {
 };
 
 /*
- * File_ops->open method for <debugfs>/dynamic_debug/control.  Does the seq_file
- * setup dance, and also creates an iterator to walk the _ddebugs.
- * Note that we create a seq_file always, even for O_WRONLY files
- * where it's not needed, as doing so simplifies the ->release method.
+ * File_ops->open method for <debugfs>/dynamic_debug/control.  Does
+ * the seq_file setup dance, and also creates an iterator to walk the
+ * _ddebugs.  Note that we create a seq_file always, even for O_WRONLY
+ * files where it's not needed, as doing so simplifies the ->release
+ * method.
  */
 static int ddebug_proc_open(struct inode *inode, struct file *file)
 {
@@ -846,33 +943,40 @@ static int __init dynamic_debug_init(void)
         int ret = 0;
         int n = 0;
 
-        if (__start___verbose != __stop___verbose) {
-                iter = __start___verbose;
-                modname = iter->modname;
-                iter_start = iter;
-                for (; iter < __stop___verbose; iter++) {
-                        if (strcmp(modname, iter->modname)) {
-                                ret = ddebug_add_module(iter_start, n, modname);
-                                if (ret)
-                                        goto out_free;
-                                n = 0;
-                                modname = iter->modname;
-                                iter_start = iter;
-                        }
-                        n++;
+        if (__start___verbose == __stop___verbose) {
+                pr_warn("_ddebug table is empty in a "
+                        "CONFIG_DYNAMIC_DEBUG build");
+                return 1;
+        }
+        iter = __start___verbose;
+        modname = iter->modname;
+        iter_start = iter;
+        for (; iter < __stop___verbose; iter++) {
+                if (strcmp(modname, iter->modname)) {
+                        ret = ddebug_add_module(iter_start, n, modname);
+                        if (ret)
+                                goto out_free;
+                        n = 0;
+                        modname = iter->modname;
+                        iter_start = iter;
                 }
-                ret = ddebug_add_module(iter_start, n, modname);
+                n++;
         }
+        ret = ddebug_add_module(iter_start, n, modname);
+        if (ret)
+                goto out_free;
 
         /* ddebug_query boot param got passed -> set it up */
         if (ddebug_setup_string[0] != '\0') {
-                ret = ddebug_exec_query(ddebug_setup_string);
-                if (ret)
+                ret = ddebug_exec_queries(ddebug_setup_string);
+                if (ret < 0)
                         pr_warn("Invalid ddebug boot param %s",
                                 ddebug_setup_string);
                 else
-                        pr_info("ddebug initialized with string %s",
-                                ddebug_setup_string);
+                        pr_info("%d changes by ddebug_query\n", ret);
+
+                /* keep tables even on ddebug_query parse error */
+                ret = 0;
         }
 
 out_free:
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index e66e9b632617..75cbdb52bf5c 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -29,16 +29,17 @@
 
 u64 uevent_seqnum;
 char uevent_helper[UEVENT_HELPER_PATH_LEN] = CONFIG_UEVENT_HELPER_PATH;
-static DEFINE_SPINLOCK(sequence_lock);
 #ifdef CONFIG_NET
 struct uevent_sock {
         struct list_head list;
         struct sock *sk;
 };
 static LIST_HEAD(uevent_sock_list);
-static DEFINE_MUTEX(uevent_sock_mutex);
 #endif
 
+/* This lock protects uevent_seqnum and uevent_sock_list */
+static DEFINE_MUTEX(uevent_sock_mutex);
+
 /* the strings here must match the enum in include/linux/kobject.h */
 static const char *kobject_actions[] = {
         [KOBJ_ADD] =            "add",
@@ -136,7 +137,6 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
         struct kobject *top_kobj;
         struct kset *kset;
         const struct kset_uevent_ops *uevent_ops;
-        u64 seq;
         int i = 0;
         int retval = 0;
 #ifdef CONFIG_NET
@@ -243,17 +243,16 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
         else if (action == KOBJ_REMOVE)
                 kobj->state_remove_uevent_sent = 1;
 
+        mutex_lock(&uevent_sock_mutex);
         /* we will send an event, so request a new sequence number */
-        spin_lock(&sequence_lock);
-        seq = ++uevent_seqnum;
-        spin_unlock(&sequence_lock);
-        retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)seq);
-        if (retval)
+        retval = add_uevent_var(env, "SEQNUM=%llu", (unsigned long long)++uevent_seqnum);
+        if (retval) {
+                mutex_unlock(&uevent_sock_mutex);
                 goto exit;
+        }
 
 #if defined(CONFIG_NET)
         /* send netlink message */
-        mutex_lock(&uevent_sock_mutex);
         list_for_each_entry(ue_sk, &uevent_sock_list, list) {
                 struct sock *uevent_sock = ue_sk->sk;
                 struct sk_buff *skb;
@@ -290,8 +289,8 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
                 } else
                         retval = -ENOMEM;
         }
-        mutex_unlock(&uevent_sock_mutex);
 #endif
+        mutex_unlock(&uevent_sock_mutex);
 
         /* call uevent_helper, usually only enabled during early boot */
         if (uevent_helper[0] && !kobj_usermode_filter(kobj)) {