[patch 06/19] [PATCH] dpt_i2o fix for deadlock condition

[Greg Kroah-Hartman]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: "Salyzyn, Mark" <mark_salyzyn@xxxxxxxxxxx>

Miquel van Smoorenburg <miquels@xxxxxxxxxx> forwarded me this fix to
resolve a deadlock condition that occurs due to the API change in 2.6.13+
kernels dropping the host locking when entering the error handling.  They
all end up calling adpt_i2o_post_wait(), which if you call it unlocked,
might return with host_lock locked anyway and that causes a deadlock.

Signed-off-by: Mark Salyzyn <aacraid@xxxxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 drivers/scsi/dpt_i2o.c |   25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

--- linux-2.6.14.4.orig/drivers/scsi/dpt_i2o.c
+++ linux-2.6.14.4/drivers/scsi/dpt_i2o.c
@@ -660,7 +660,12 @@ static int adpt_abort(struct scsi_cmnd *
 	msg[2] = 0;
 	msg[3]= 0; 
 	msg[4] = (u32)cmd;
-	if( (rcode = adpt_i2o_post_wait(pHba, msg, sizeof(msg), FOREVER)) != 0){
+	if (pHba->host)
+		spin_lock_irq(pHba->host->host_lock);
+	rcode = adpt_i2o_post_wait(pHba, msg, sizeof(msg), FOREVER);
+	if (pHba->host)
+		spin_unlock_irq(pHba->host->host_lock);
+	if (rcode != 0) {
 		if(rcode == -EOPNOTSUPP ){
 			printk(KERN_INFO"%s: Abort cmd not supported\n",pHba->name);
 			return FAILED;
@@ -697,10 +702,15 @@ static int adpt_device_reset(struct scsi
 	msg[2] = 0;
 	msg[3] = 0;
 
+	if (pHba->host)
+		spin_lock_irq(pHba->host->host_lock);
 	old_state = d->state;
 	d->state |= DPTI_DEV_RESET;
-	if( (rcode = adpt_i2o_post_wait(pHba, msg,sizeof(msg), FOREVER)) ){
-		d->state = old_state;
+	rcode = adpt_i2o_post_wait(pHba, msg,sizeof(msg), FOREVER);
+	d->state = old_state;
+	if (pHba->host)
+		spin_unlock_irq(pHba->host->host_lock);
+	if (rcode != 0) {
 		if(rcode == -EOPNOTSUPP ){
 			printk(KERN_INFO"%s: Device reset not supported\n",pHba->name);
 			return FAILED;
@@ -708,7 +718,6 @@ static int adpt_device_reset(struct scsi
 		printk(KERN_INFO"%s: Device reset failed\n",pHba->name);
 		return FAILED;
 	} else {
-		d->state = old_state;
 		printk(KERN_INFO"%s: Device reset successful\n",pHba->name);
 		return SUCCESS;
 	}
@@ -721,6 +730,7 @@ static int adpt_bus_reset(struct scsi_cm
 {
 	adpt_hba* pHba;
 	u32 msg[4];
+	u32 rcode;
 
 	pHba = (adpt_hba*)cmd->device->host->hostdata[0];
 	memset(msg, 0, sizeof(msg));
@@ -729,7 +739,12 @@ static int adpt_bus_reset(struct scsi_cm
 	msg[1] = (I2O_HBA_BUS_RESET<<24|HOST_TID<<12|pHba->channel[cmd->device->channel].tid);
 	msg[2] = 0;
 	msg[3] = 0;
-	if(adpt_i2o_post_wait(pHba, msg,sizeof(msg), FOREVER) ){
+	if (pHba->host)
+		spin_lock_irq(pHba->host->host_lock);
+	rcode = adpt_i2o_post_wait(pHba, msg,sizeof(msg), FOREVER);
+	if (pHba->host)
+		spin_unlock_irq(pHba->host->host_lock);
+	if (rcode != 0) {
 		printk(KERN_WARNING"%s: Bus reset failed.\n",pHba->name);
 		return FAILED;
 	} else {

--
-
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