[SCSI] aacraid: Re-start helper thread if it dies

Received from Mark Salyzyn

Since the helper thread for the driver can be killed unceremoniously by
an application, we detect the loss of the helper and restart it.
Signed-off-by: Mark Haverkamp <markh@osdl.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/aacraid/commctrl.c

@@ -38,6 +38,8 @@
 #include <linux/completion.h>
 #include <linux/dma-mapping.h>
 #include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
 
@@ -293,6 +295,16 @@ static int next_getadapter_fib(struct aac_dev * dev, void __user *arg)
 		status = 0;
 	} else {
 		spin_unlock_irqrestore(&dev->fib_lock, flags);
+		/* If someone killed the AIF aacraid thread, restart it */
+		status = !dev->aif_thread;
+		if (status && dev->queues && dev->fsa_dev) {
+			/* Be paranoid, be very paranoid! */
+			kthread_stop(dev->thread);
+			ssleep(1);
+			dev->aif_thread = 0;
+			dev->thread = kthread_run(aac_command_thread, dev, dev->name);
+			ssleep(1);
+		}
 		if (f.wait) {
 			if(down_interruptible(&fibctx->wait_sem) < 0) {
 				status = -EINTR;