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[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>
This commit is contained in:
Mark Haverkamp 2006-03-27 09:44:26 -08:00 committed by James Bottomley
parent 1241f3593a
commit dc4adbf413
1 changed files with 12 additions and 0 deletions
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12
drivers/scsi/aacraid/commctrl.c
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@ -38,6 +38,8 @@
#include <linux/completion.h> #include <linux/completion.h>
#include <linux/dma-mapping.h> #include <linux/dma-mapping.h>
#include <linux/blkdev.h> #include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <asm/semaphore.h> #include <asm/semaphore.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
@ -293,6 +295,16 @@ static int next_getadapter_fib(struct aac_dev * dev, void __user *arg)
status = 0; status = 0;
} else { } else {
spin_unlock_irqrestore(&dev->fib_lock, flags); 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 (f.wait) {
if(down_interruptible(&fibctx->wait_sem) < 0) { if(down_interruptible(&fibctx->wait_sem) < 0) {
status = -EINTR; status = -EINTR;