cxlflash: Fix to avoid stall while waiting on TMF
Borrowing the TMF waitq's spinlock causes a stall condition when
waiting for the TMF to complete. To remedy, introduce our own spin
lock to serialize TMF and use the appropriate wait services.
Also add a timeout while waiting for a TMF completion. When a TMF
times out, report back a failure such that a bigger hammer reset
can occur.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h
index b038ac7..7a0cb5c 100644
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -124,6 +124,7 @@
struct list_head lluns; /* list of llun_info structs */
wait_queue_head_t tmf_waitq;
+ spinlock_t tmf_slock;
bool tmf_active;
wait_queue_head_t reset_waitq;
enum cxlflash_state state;
diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index 527ff85..110037d 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -249,11 +249,10 @@
scp->scsi_done(scp);
if (cmd_is_tmf) {
- spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
+ spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
cfg->tmf_active = false;
wake_up_all_locked(&cfg->tmf_waitq);
- spin_unlock_irqrestore(&cfg->tmf_waitq.lock,
- lock_flags);
+ spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
}
} else
complete(&cmd->cevent);
@@ -420,6 +419,7 @@
struct device *dev = &cfg->dev->dev;
ulong lock_flags;
int rc = 0;
+ ulong to;
cmd = cmd_checkout(afu);
if (unlikely(!cmd)) {
@@ -428,15 +428,15 @@
goto out;
}
- /* If a Task Management Function is active, do not send one more.
- */
- spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
+ /* When Task Management Function is active do not send another */
+ spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
if (cfg->tmf_active)
- wait_event_interruptible_locked_irq(cfg->tmf_waitq,
- !cfg->tmf_active);
+ wait_event_interruptible_lock_irq(cfg->tmf_waitq,
+ !cfg->tmf_active,
+ cfg->tmf_slock);
cfg->tmf_active = true;
cmd->cmd_tmf = true;
- spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
+ spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
cmd->rcb.ctx_id = afu->ctx_hndl;
cmd->rcb.port_sel = port_sel;
@@ -457,15 +457,24 @@
rc = send_cmd(afu, cmd);
if (unlikely(rc)) {
cmd_checkin(cmd);
- spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
+ spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
cfg->tmf_active = false;
- spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
+ spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
goto out;
}
- spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
- wait_event_interruptible_locked_irq(cfg->tmf_waitq, !cfg->tmf_active);
- spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
+ spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
+ to = msecs_to_jiffies(5000);
+ to = wait_event_interruptible_lock_irq_timeout(cfg->tmf_waitq,
+ !cfg->tmf_active,
+ cfg->tmf_slock,
+ to);
+ if (!to) {
+ cfg->tmf_active = false;
+ dev_err(dev, "%s: TMF timed out!\n", __func__);
+ rc = -1;
+ }
+ spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
out:
return rc;
}
@@ -512,16 +521,17 @@
get_unaligned_be32(&((u32 *)scp->cmnd)[2]),
get_unaligned_be32(&((u32 *)scp->cmnd)[3]));
- /* If a Task Management Function is active, wait for it to complete
+ /*
+ * If a Task Management Function is active, wait for it to complete
* before continuing with regular commands.
*/
- spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
+ spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
if (cfg->tmf_active) {
- spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
+ spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
rc = SCSI_MLQUEUE_HOST_BUSY;
goto out;
}
- spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
+ spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
switch (cfg->state) {
case STATE_RESET:
@@ -713,11 +723,12 @@
/* If a Task Management Function is active, wait for it to complete
* before continuing with remove.
*/
- spin_lock_irqsave(&cfg->tmf_waitq.lock, lock_flags);
+ spin_lock_irqsave(&cfg->tmf_slock, lock_flags);
if (cfg->tmf_active)
- wait_event_interruptible_locked_irq(cfg->tmf_waitq,
- !cfg->tmf_active);
- spin_unlock_irqrestore(&cfg->tmf_waitq.lock, lock_flags);
+ wait_event_interruptible_lock_irq(cfg->tmf_waitq,
+ !cfg->tmf_active,
+ cfg->tmf_slock);
+ spin_unlock_irqrestore(&cfg->tmf_slock, lock_flags);
cfg->state = STATE_FAILTERM;
cxlflash_stop_term_user_contexts(cfg);