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authorJames Bottomley <James.Bottomley@steeleye.com>2006-02-23 12:43:43 -0600
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-02-27 23:34:40 -0600
commit1fa44ecad2b86475e038aed81b0bf333fa484f8b (patch)
tree62e9e9aac0aaf64e6f8e69809d8ab513e22346a1 /kernel/workqueue.c
parentba3af0aff042caa1f41b5f7164cab37c717b8811 (diff)
downloadop-kernel-dev-1fa44ecad2b86475e038aed81b0bf333fa484f8b.zip
op-kernel-dev-1fa44ecad2b86475e038aed81b0bf333fa484f8b.tar.gz
[SCSI] add execute_in_process_context() API
We have several points in the SCSI stack (primarily for our device functions) where we need to guarantee process context, but (given the place where the last reference was released) we cannot guarantee this. This API gets around the issue by executing the function directly if the caller has process context, but scheduling a workqueue to execute in process context if the caller doesn't have it. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'kernel/workqueue.c')
-rw-r--r--kernel/workqueue.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index b052e2c..e9e464a 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -27,6 +27,7 @@
#include <linux/cpu.h>
#include <linux/notifier.h>
#include <linux/kthread.h>
+#include <linux/hardirq.h>
/*
* The per-CPU workqueue (if single thread, we always use the first
@@ -476,6 +477,34 @@ void cancel_rearming_delayed_work(struct work_struct *work)
}
EXPORT_SYMBOL(cancel_rearming_delayed_work);
+/**
+ * execute_in_process_context - reliably execute the routine with user context
+ * @fn: the function to execute
+ * @data: data to pass to the function
+ * @ew: guaranteed storage for the execute work structure (must
+ * be available when the work executes)
+ *
+ * Executes the function immediately if process context is available,
+ * otherwise schedules the function for delayed execution.
+ *
+ * Returns: 0 - function was executed
+ * 1 - function was scheduled for execution
+ */
+int execute_in_process_context(void (*fn)(void *data), void *data,
+ struct execute_work *ew)
+{
+ if (!in_interrupt()) {
+ fn(data);
+ return 0;
+ }
+
+ INIT_WORK(&ew->work, fn, data);
+ schedule_work(&ew->work);
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(execute_in_process_context);
+
int keventd_up(void)
{
return keventd_wq != NULL;
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