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-rw-r--r--drivers/base/dd.c30
-rw-r--r--include/asm-generic/vmlinux.lds.h9
-rw-r--r--include/linux/init.h28
3 files changed, 57 insertions, 10 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index db01b95..c5d6bb4 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -18,6 +18,7 @@
#include <linux/device.h>
#include <linux/module.h>
#include <linux/kthread.h>
+#include <linux/wait.h>
#include "base.h"
#include "power/power.h"
@@ -70,6 +71,8 @@ struct stupid_thread_structure {
};
static atomic_t probe_count = ATOMIC_INIT(0);
+static DECLARE_WAIT_QUEUE_HEAD(probe_waitqueue);
+
static int really_probe(void *void_data)
{
struct stupid_thread_structure *data = void_data;
@@ -121,6 +124,7 @@ probe_failed:
done:
kfree(data);
atomic_dec(&probe_count);
+ wake_up(&probe_waitqueue);
return ret;
}
@@ -337,6 +341,32 @@ void driver_detach(struct device_driver * drv)
}
}
+#ifdef CONFIG_PCI_MULTITHREAD_PROBE
+static int __init wait_for_probes(void)
+{
+ DEFINE_WAIT(wait);
+
+ printk(KERN_INFO "%s: waiting for %d threads\n", __FUNCTION__,
+ atomic_read(&probe_count));
+ if (!atomic_read(&probe_count))
+ return 0;
+ while (atomic_read(&probe_count)) {
+ prepare_to_wait(&probe_waitqueue, &wait, TASK_UNINTERRUPTIBLE);
+ if (atomic_read(&probe_count))
+ schedule();
+ }
+ finish_wait(&probe_waitqueue, &wait);
+ return 0;
+}
+
+core_initcall_sync(wait_for_probes);
+postcore_initcall_sync(wait_for_probes);
+arch_initcall_sync(wait_for_probes);
+subsys_initcall_sync(wait_for_probes);
+fs_initcall_sync(wait_for_probes);
+device_initcall_sync(wait_for_probes);
+late_initcall_sync(wait_for_probes);
+#endif
EXPORT_SYMBOL_GPL(device_bind_driver);
EXPORT_SYMBOL_GPL(device_release_driver);
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index e3e83bc..9d87316 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -216,10 +216,17 @@
#define INITCALLS \
*(.initcall1.init) \
+ *(.initcall1s.init) \
*(.initcall2.init) \
+ *(.initcall2s.init) \
*(.initcall3.init) \
+ *(.initcall3s.init) \
*(.initcall4.init) \
+ *(.initcall4s.init) \
*(.initcall5.init) \
+ *(.initcall5s.init) \
*(.initcall6.init) \
- *(.initcall7.init)
+ *(.initcall6s.init) \
+ *(.initcall7.init) \
+ *(.initcall7s.init)
diff --git a/include/linux/init.h b/include/linux/init.h
index e92b145..ff40ea1 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -84,19 +84,29 @@ extern void setup_arch(char **);
* by link order.
* For backwards compatibility, initcall() puts the call in
* the device init subsection.
+ *
+ * The `id' arg to __define_initcall() is needed so that multiple initcalls
+ * can point at the same handler without causing duplicate-symbol build errors.
*/
-#define __define_initcall(level,fn) \
- static initcall_t __initcall_##fn __attribute_used__ \
+#define __define_initcall(level,fn,id) \
+ static initcall_t __initcall_##fn##id __attribute_used__ \
__attribute__((__section__(".initcall" level ".init"))) = fn
-#define core_initcall(fn) __define_initcall("1",fn)
-#define postcore_initcall(fn) __define_initcall("2",fn)
-#define arch_initcall(fn) __define_initcall("3",fn)
-#define subsys_initcall(fn) __define_initcall("4",fn)
-#define fs_initcall(fn) __define_initcall("5",fn)
-#define device_initcall(fn) __define_initcall("6",fn)
-#define late_initcall(fn) __define_initcall("7",fn)
+#define core_initcall(fn) __define_initcall("1",fn,1)
+#define core_initcall_sync(fn) __define_initcall("1s",fn,1s)
+#define postcore_initcall(fn) __define_initcall("2",fn,2)
+#define postcore_initcall_sync(fn) __define_initcall("2s",fn,2s)
+#define arch_initcall(fn) __define_initcall("3",fn,3)
+#define arch_initcall_sync(fn) __define_initcall("3s",fn,3s)
+#define subsys_initcall(fn) __define_initcall("4",fn,4)
+#define subsys_initcall_sync(fn) __define_initcall("4s",fn,4s)
+#define fs_initcall(fn) __define_initcall("5",fn,5)
+#define fs_initcall_sync(fn) __define_initcall("5s",fn,5s)
+#define device_initcall(fn) __define_initcall("6",fn,6)
+#define device_initcall_sync(fn) __define_initcall("6s",fn,6s)
+#define late_initcall(fn) __define_initcall("7",fn,7)
+#define late_initcall_sync(fn) __define_initcall("7s",fn,7s)
#define __initcall(fn) device_initcall(fn)