w1: increase w1_max_slave_count, allow write access

w1_max_slave_count is only used to abort the search early
or take a fast search (when 1), so there isn't any reason to not allow
it to be updated through sysfs.  Memory is not allocated based on
the current value and 10 is a rather low base number, increasing to
64, and printing a message the first time the count is reached and
there were more devices to discover to let the user know why not
all the devices were found.

Signed-off-by: David Fries <David@Fries.net>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 30 insertions, 2 deletions

diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 92766a9f8b4d..34ffdc6da4fb 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -46,7 +46,7 @@ MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
 
 static int w1_timeout = 10;
-int w1_max_slave_count = 10;
+int w1_max_slave_count = 64;
 int w1_max_slave_ttl = 10;
 
 module_param_named(timeout, w1_timeout, int, 0);
@@ -316,6 +316,24 @@ static ssize_t w1_master_attribute_show_timeout(struct device *dev, struct devic
         return count;
 }
 
+static ssize_t w1_master_attribute_store_max_slave_count(struct device *dev,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        long tmp;
+        struct w1_master *md = dev_to_w1_master(dev);
+
+        if (kstrtol(buf, 0, &tmp) == -EINVAL || tmp < 1)
+                return -EINVAL;
+
+        mutex_lock(&md->mutex);
+        md->max_slave_count = tmp;
+        /* allow each time the max_slave_count is updated */
+        clear_bit(W1_WARN_MAX_COUNT, &md->flags);
+        mutex_unlock(&md->mutex);
+
+        return count;
+}
+
 static ssize_t w1_master_attribute_show_max_slave_count(struct device *dev, struct device_attribute *attr, char *buf)
 {
         struct w1_master *md = dev_to_w1_master(dev);
@@ -518,7 +536,7 @@ static ssize_t w1_master_attribute_store_remove(struct device *dev,
 static W1_MASTER_ATTR_RO(name, S_IRUGO);
 static W1_MASTER_ATTR_RO(slaves, S_IRUGO);
 static W1_MASTER_ATTR_RO(slave_count, S_IRUGO);
-static W1_MASTER_ATTR_RO(max_slave_count, S_IRUGO);
+static W1_MASTER_ATTR_RW(max_slave_count, S_IRUGO | S_IWUSR | S_IWGRP);
 static W1_MASTER_ATTR_RO(attempts, S_IRUGO);
 static W1_MASTER_ATTR_RO(timeout, S_IRUGO);
 static W1_MASTER_ATTR_RO(pointer, S_IRUGO);
@@ -976,6 +994,14 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb
                         desc_bit = last_zero;
                         cb(dev, rn);
                 }
+
+                if (!last_device && slave_count == dev->max_slave_count &&
+                        !test_bit(W1_WARN_MAX_COUNT, &dev->flags)) {
+                        dev_info(&dev->dev, "%s: max_slave_count %d reached, "
+                                "additional sensors ignored\n", __func__,
+                                dev->max_slave_count);
+                        set_bit(W1_WARN_MAX_COUNT, &dev->flags);
+                }
         }
 }
 
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index bc329d2bba28..bd10b3c2a406 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -158,9 +158,11 @@ struct w1_bus_master
 /**
  * enum w1_master_flags - bitfields used in w1_master.flags
  * @W1_ABORT_SEARCH: abort searching early on shutdown
+ * @W1_WARN_MAX_COUNT: limit warning when the maximum count is reached
  */
 enum w1_master_flags {
         W1_ABORT_SEARCH = 0,
+        W1_WARN_MAX_COUNT = 1,
 };
 
 struct w1_master