[PATCH 4.4 107/210] mtip32xx: Fix for rmmod crash when drive is in FTL rebuild

From: Greg Kroah-Hartman
Date: Sun Apr 10 2016 - 15:56:38 EST


4.4-stable review patch. If anyone has any objections, please let me know.

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

From: Asai Thambi SP <asamymuthupa@xxxxxxxxxx>

commit 59cf70e236c96594d9f1e065755d8fce9df5356b upstream.

When FTL rebuild is in progress, alloc_disk() initializes the disk
but device node will be created by add_disk() only after successful
completion of FTL rebuild. So, skip deletion of device node in
removal path when FTL rebuild is in progress.

Signed-off-by: Selvan Mani <smani@xxxxxxxxxx>
Signed-off-by: Asai Thambi S P <asamymuthupa@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/block/mtip32xx/mtip32xx.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)

--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -2975,10 +2975,8 @@ restart_eh:
}

if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
- if (mtip_ftl_rebuild_poll(dd) < 0)
- set_bit(MTIP_DDF_REBUILD_FAILED_BIT,
- &dd->dd_flag);
- clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
+ if (mtip_ftl_rebuild_poll(dd) == 0)
+ clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
}
}

@@ -3858,7 +3856,6 @@ static int mtip_block_initialize(struct

mtip_hw_debugfs_init(dd);

-skip_create_disk:
memset(&dd->tags, 0, sizeof(dd->tags));
dd->tags.ops = &mtip_mq_ops;
dd->tags.nr_hw_queues = 1;
@@ -3888,6 +3885,7 @@ skip_create_disk:
dd->disk->queue = dd->queue;
dd->queue->queuedata = dd;

+skip_create_disk:
/* Initialize the protocol layer. */
wait_for_rebuild = mtip_hw_get_identify(dd);
if (wait_for_rebuild < 0) {
@@ -4048,7 +4046,8 @@ static int mtip_block_remove(struct driv
dd->bdev = NULL;
}
if (dd->disk) {
- del_gendisk(dd->disk);
+ if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
+ del_gendisk(dd->disk);
if (dd->disk->queue) {
blk_cleanup_queue(dd->queue);
blk_mq_free_tag_set(&dd->tags);
@@ -4089,7 +4088,8 @@ static int mtip_block_shutdown(struct dr
dev_info(&dd->pdev->dev,
"Shutting down %s ...\n", dd->disk->disk_name);

- del_gendisk(dd->disk);
+ if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
+ del_gendisk(dd->disk);
if (dd->disk->queue) {
blk_cleanup_queue(dd->queue);
blk_mq_free_tag_set(&dd->tags);