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authorDavid Fries <david@fries.net>2008-10-16 01:04:53 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-16 14:21:50 -0400
commitaf00a2d5a047455b35d1e7dc4c7d9993c2bcfb93 (patch)
tree2ad744edff4aa6b4f63c39b9285b578f407fff74 /drivers/w1/w1_int.c
parente0d29c7699de723432da268748aefe9624fc8529 (diff)
W1: w1_int.c use first available master number
Follow the example of other devices (like the joystick device). Pick the first available id for each detected device. Currently for USB devices, suspending and resuming would cause the number to increment. Signed-off-by: David Fries <david@fries.net> Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/w1/w1_int.c')
-rw-r--r--drivers/w1/w1_int.c32
1 files changed, 26 insertions, 6 deletions
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index 3fd6e6651fbe..a3a54567bfba 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -29,7 +29,6 @@
29#include "w1_netlink.h" 29#include "w1_netlink.h"
30#include "w1_int.h" 30#include "w1_int.h"
31 31
32static u32 w1_ids = 1;
33static int w1_search_count = -1; /* Default is continual scan */ 32static int w1_search_count = -1; /* Default is continual scan */
34module_param_named(search_count, w1_search_count, int, 0); 33module_param_named(search_count, w1_search_count, int, 0);
35 34
@@ -102,9 +101,10 @@ static void w1_free_dev(struct w1_master *dev)
102 101
103int w1_add_master_device(struct w1_bus_master *master) 102int w1_add_master_device(struct w1_bus_master *master)
104{ 103{
105 struct w1_master *dev; 104 struct w1_master *dev, *entry;
106 int retval = 0; 105 int retval = 0;
107 struct w1_netlink_msg msg; 106 struct w1_netlink_msg msg;
107 int id, found;
108 108
109 /* validate minimum functionality */ 109 /* validate minimum functionality */
110 if (!(master->touch_bit && master->reset_bus) && 110 if (!(master->touch_bit && master->reset_bus) &&
@@ -126,13 +126,33 @@ int w1_add_master_device(struct w1_bus_master *master)
126 master->set_pullup = NULL; 126 master->set_pullup = NULL;
127 } 127 }
128 128
129 dev = w1_alloc_dev(w1_ids++, w1_max_slave_count, w1_max_slave_ttl, &w1_master_driver, &w1_master_device); 129 /* Lock until the device is added (or not) to w1_masters. */
130 if (!dev) 130 mutex_lock(&w1_mlock);
131 /* Search for the first available id (starting at 1). */
132 id = 0;
133 do {
134 ++id;
135 found = 0;
136 list_for_each_entry(entry, &w1_masters, w1_master_entry) {
137 if (entry->id == id) {
138 found = 1;
139 break;
140 }
141 }
142 } while (found);
143
144 dev = w1_alloc_dev(id, w1_max_slave_count, w1_max_slave_ttl,
145 &w1_master_driver, &w1_master_device);
146 if (!dev) {
147 mutex_unlock(&w1_mlock);
131 return -ENOMEM; 148 return -ENOMEM;
149 }
132 150
133 retval = w1_create_master_attributes(dev); 151 retval = w1_create_master_attributes(dev);
134 if (retval) 152 if (retval) {
153 mutex_unlock(&w1_mlock);
135 goto err_out_free_dev; 154 goto err_out_free_dev;
155 }
136 156
137 memcpy(dev->bus_master, master, sizeof(struct w1_bus_master)); 157 memcpy(dev->bus_master, master, sizeof(struct w1_bus_master));
138 158
@@ -144,10 +164,10 @@ int w1_add_master_device(struct w1_bus_master *master)
144 dev_err(&dev->dev, 164 dev_err(&dev->dev,
145 "Failed to create new kernel thread. err=%d\n", 165 "Failed to create new kernel thread. err=%d\n",
146 retval); 166 retval);
167 mutex_unlock(&w1_mlock);
147 goto err_out_rm_attr; 168 goto err_out_rm_attr;
148 } 169 }
149 170
150 mutex_lock(&w1_mlock);
151 list_add(&dev->w1_master_entry, &w1_masters); 171 list_add(&dev->w1_master_entry, &w1_masters);
152 mutex_unlock(&w1_mlock); 172 mutex_unlock(&w1_mlock);
153 173