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

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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/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;