[2.6 patch] dpt_i2o fix for deadlock condition

["Salyzyn, Mark" <mark_salyzyn@adaptec.com>]

[-- Attachment #1: Type: text/plain, Size: 633 bytes --]

Miquel van Smoorenburg <miquels@cistron.nl> 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@adaptec.com>

 drivers/scsi/dpt_i2o.c |    25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

Patch attached to email due to Outlook corrupting content when inlined.

Sincerely -- Mark Salyzyn

[-- Attachment #2: dpt_i2o.deadlock.patch --]
[-- Type: application/octet-stream, Size: 1999 bytes --]

--- a/drivers/scsi/dpt_i2o.c	2005-11-29 10:34:55.106090160 -0500
+++ b/drivers/scsi/dpt_i2o.c	2005-11-29 11:41:36.924466022 -0500
@@ -660,7 +660,12 @@
 	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 @@
 	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 @@
 		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 @@
 {
 	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 @@
 	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 {