cciss: Use one scan thread per controller and fix hang during rmmod
Replace the use of one scan kthread per controller with one per driver.
Use a queue to hold a list of controllers that need to be rescanned with
routines to add and remove controllers from the queue.
Fix locking and completion handling to prevent a hang during rmmod.
Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Acked-by: Mike Miller <mike.miller@hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index 06a5db2..4fb3639 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -2,6 +2,7 @@
#define CCISS_H
#include <linux/genhd.h>
+#include <linux/mutex.h>
#include "cciss_cmd.h"
@@ -108,6 +109,8 @@
int nr_frees;
int busy_configuring;
int busy_initializing;
+ int busy_scanning;
+ struct mutex busy_shutting_down;
/* This element holds the zero based queue number of the last
* queue to be started. It is used for fairness.
@@ -122,8 +125,8 @@
/* and saved for later processing */
#endif
unsigned char alive;
- struct completion *rescan_wait;
- struct task_struct *cciss_scan_thread;
+ struct list_head scan_list;
+ struct completion scan_wait;
struct device dev;
};