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Subject[PATCH 4.9 51/93] scsi: ibmvscsis: Synchronize cmds at remove time
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michael Cyr <mikecyr@us.ibm.com>

[ Upstream commit 8bf11557d44d00562360d370de8aa70ba89aa0d5 ]

This patch adds code to disconnect from the client, which will make sure
any outstanding commands have been completed, before continuing on with
the remove operation.

Signed-off-by: Michael Cyr <mikecyr@us.ibm.com>
Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Tested-by: Steven Royer <seroyer@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 39 +++++++++++++++++++++++++++----
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h | 3 ++
2 files changed, 37 insertions(+), 5 deletions(-)

--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
@@ -470,6 +470,18 @@ static void ibmvscsis_disconnect(struct

case WAIT_ENABLED:
switch (new_state) {
+ case UNCONFIGURING:
+ vscsi->state = new_state;
+ vscsi->flags |= RESPONSE_Q_DOWN;
+ vscsi->flags &= ~(SCHEDULE_DISCONNECT |
+ DISCONNECT_SCHEDULED);
+ dma_rmb();
+ if (vscsi->flags & CFG_SLEEPING) {
+ vscsi->flags &= ~CFG_SLEEPING;
+ complete(&vscsi->unconfig);
+ }
+ break;
+
/* should never happen */
case ERR_DISCONNECT:
case ERR_DISCONNECT_RECONNECT:
@@ -482,6 +494,13 @@ static void ibmvscsis_disconnect(struct

case WAIT_IDLE:
switch (new_state) {
+ case UNCONFIGURING:
+ vscsi->flags |= RESPONSE_Q_DOWN;
+ vscsi->state = new_state;
+ vscsi->flags &= ~(SCHEDULE_DISCONNECT |
+ DISCONNECT_SCHEDULED);
+ ibmvscsis_free_command_q(vscsi);
+ break;
case ERR_DISCONNECT:
case ERR_DISCONNECT_RECONNECT:
vscsi->state = new_state;
@@ -1187,6 +1206,15 @@ static void ibmvscsis_adapter_idle(struc
free_qs = true;

switch (vscsi->state) {
+ case UNCONFIGURING:
+ ibmvscsis_free_command_q(vscsi);
+ dma_rmb();
+ isync();
+ if (vscsi->flags & CFG_SLEEPING) {
+ vscsi->flags &= ~CFG_SLEEPING;
+ complete(&vscsi->unconfig);
+ }
+ break;
case ERR_DISCONNECT_RECONNECT:
ibmvscsis_reset_queue(vscsi);
pr_debug("adapter_idle, disc_rec: flags 0x%x\n", vscsi->flags);
@@ -3342,6 +3370,7 @@ static int ibmvscsis_probe(struct vio_de
(unsigned long)vscsi);

init_completion(&vscsi->wait_idle);
+ init_completion(&vscsi->unconfig);

snprintf(wq_name, 24, "ibmvscsis%s", dev_name(&vdev->dev));
vscsi->work_q = create_workqueue(wq_name);
@@ -3397,10 +3426,11 @@ static int ibmvscsis_remove(struct vio_d

pr_debug("remove (%s)\n", dev_name(&vscsi->dma_dev->dev));

- /*
- * TBD: Need to handle if there are commands on the waiting_rsp q
- * Actually, can there still be cmds outstanding to tcm?
- */
+ spin_lock_bh(&vscsi->intr_lock);
+ ibmvscsis_post_disconnect(vscsi, UNCONFIGURING, 0);
+ vscsi->flags |= CFG_SLEEPING;
+ spin_unlock_bh(&vscsi->intr_lock);
+ wait_for_completion(&vscsi->unconfig);

vio_disable_interrupts(vdev);
free_irq(vdev->irq, vscsi);
@@ -3409,7 +3439,6 @@ static int ibmvscsis_remove(struct vio_d
DMA_BIDIRECTIONAL);
kfree(vscsi->map_buf);
tasklet_kill(&vscsi->work_task);
- ibmvscsis_unregister_command_q(vscsi);
ibmvscsis_destroy_command_q(vscsi);
ibmvscsis_freetimer(vscsi);
ibmvscsis_free_cmds(vscsi);
--- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h
+++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h
@@ -257,6 +257,8 @@ struct scsi_info {
#define SCHEDULE_DISCONNECT 0x00400
/* disconnect handler is scheduled */
#define DISCONNECT_SCHEDULED 0x00800
+ /* remove function is sleeping */
+#define CFG_SLEEPING 0x01000
u32 flags;
/* adapter lock */
spinlock_t intr_lock;
@@ -285,6 +287,7 @@ struct scsi_info {

struct workqueue_struct *work_q;
struct completion wait_idle;
+ struct completion unconfig;
struct device dev;
struct vio_dev *dma_dev;
struct srp_target target;

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