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authorSalyzyn, Mark <mark_salyzyn@adaptec.com>2005-12-17 19:26:30 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2005-12-26 16:08:56 -0800
commitfe2e17a405a58ec8a7138fee4ebe101858b636e0 (patch)
tree853d4a92818650bcf6800181df01fc8ca0928fb8
parent6968ecfca8822055cfe121214c0786e4eecc038e (diff)
[PATCH] dpt_i2o fix for deadlock condition
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> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Chris Wright <chrisw@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/scsi/dpt_i2o.c25
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index 8a603ea2bbe6..9aa2d0245f32 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -660,7 +660,12 @@ static int adpt_abort(struct scsi_cmnd * cmd)
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_cmnd* cmd)
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_cmnd* cmd)
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_cmnd* cmd)
{
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_cmnd* cmd)
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 {