[SCSI] mpt2sas: Hold Controller reset when another reset is in progress
Driver should not allow multiple host reset when already host reset is in
progress. It is possible that host reset was sent by scsi mid layer while there was already an host reset active,
either issued via IOCTL interface or internaly, like a config page timeout.
Since there was a host reset active, the driver would return a FAILED response
to the scsi mid layer. The solution is make sure pending host resets will
wait for the active host reset to complete before returning control
back up the call stack.
Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index 0ec1ed3..f0c0df4 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -3804,7 +3804,7 @@
return;
/* wait for pending commands to complete */
- wait_event_timeout(ioc->reset_wq, ioc->pending_io_count == 0, 3 * HZ);
+ wait_event_timeout(ioc->reset_wq, ioc->pending_io_count == 0, 10 * HZ);
}
/**
@@ -3828,13 +3828,24 @@
if (mpt2sas_fwfault_debug)
mpt2sas_halt_firmware(ioc);
- spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
- if (ioc->shost_recovery) {
- spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
- printk(MPT2SAS_ERR_FMT "%s: busy\n",
- ioc->name, __func__);
- return -EBUSY;
+ /* TODO - What we really should be doing is pulling
+ * out all the code associated with NO_SLEEP; its never used.
+ * That is legacy code from mpt fusion driver, ported over.
+ * I will leave this BUG_ON here for now till its been resolved.
+ */
+ BUG_ON(sleep_flag == NO_SLEEP);
+
+ /* wait for an active reset in progress to complete */
+ if (!mutex_trylock(&ioc->reset_in_progress_mutex)) {
+ do {
+ ssleep(1);
+ } while (ioc->shost_recovery == 1);
+ dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: exit\n", ioc->name,
+ __func__));
+ return ioc->ioc_reset_in_progress_status;
}
+
+ spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
ioc->shost_recovery = 1;
spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
@@ -3853,9 +3864,13 @@
ioc->name, __func__, ((r == 0) ? "SUCCESS" : "FAILED")));
spin_lock_irqsave(&ioc->ioc_reset_in_progress_lock, flags);
+ ioc->ioc_reset_in_progress_status = r;
ioc->shost_recovery = 0;
complete(&ioc->shost_recovery_done);
spin_unlock_irqrestore(&ioc->ioc_reset_in_progress_lock, flags);
+ mutex_unlock(&ioc->reset_in_progress_mutex);
+ dtmprintk(ioc, printk(MPT2SAS_DEBUG_FMT "%s: exit\n", ioc->name,
+ __func__));
return r;
}
diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index 0f41fcd..6032cbf 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -600,9 +600,13 @@
int aen_event_read_flag;
u8 broadcast_aen_busy;
u8 shost_recovery;
+
+ struct mutex reset_in_progress_mutex;
struct completion shost_recovery_done;
spinlock_t ioc_reset_in_progress_lock;
u8 ioc_link_reset_in_progress;
+ int ioc_reset_in_progress_status;
+
u8 ignore_loginfos;
u8 remove_host;
u8 wait_for_port_enable_to_complete;
diff --git a/drivers/scsi/mpt2sas/mpt2sas_scsih.c b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
index 456ea7c..9ce2253 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_scsih.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_scsih.c
@@ -6557,6 +6557,7 @@
ioc->tm_sas_control_cb_idx = tm_sas_control_cb_idx;
ioc->logging_level = logging_level;
/* misc semaphores and spin locks */
+ mutex_init(&ioc->reset_in_progress_mutex);
spin_lock_init(&ioc->ioc_reset_in_progress_lock);
spin_lock_init(&ioc->scsi_lookup_lock);
spin_lock_init(&ioc->sas_device_lock);