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authormochel@digitalimplant.org <mochel@digitalimplant.org>2005-03-21 10:41:04 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2005-06-20 15:15:12 -0700
commitaf70316af182f4716cc5eec7e0d27fc731d164bd (patch)
tree22fa4732c8270db8fd3f681355cd83e4b8088847 /include
parenteb51b65005737b777e0709683b061d5f82aefd97 (diff)
[PATCH] Add a semaphore to struct device to synchronize calls to its driver.
This adds a per-device semaphore that is taken before every call from the core to a driver method. This prevents e.g. simultaneous calls to the ->suspend() or ->resume() and ->probe() or ->release(), potentially saving a whole lot of headaches. It also moves us a step closer to removing the bus rwsem, since it protects the fields in struct device that are modified by the core. Signed-off-by: Patrick Mochel <mochel@digitalimplant.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
-rw-r--r--include/linux/device.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/device.h b/include/linux/device.h
index 68a95358013..195b327f3e1 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -264,6 +264,10 @@ struct device {
struct kobject kobj;
char bus_id[BUS_ID_SIZE]; /* position on parent bus */
+ struct semaphore sem; /* semaphore to synchronize calls to
+ * its driver.
+ */
+
struct bus_type * bus; /* type of bus device is on */
struct device_driver *driver; /* which driver has allocated this
device */