Re: [PATCH] mmc: block: Prevent new req entering queue while freeing up the queue

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Hi Ulf, Adrian,

Gentle reminder. Can you share your comments on this issue and change?

Thanks

On 10/28/2020 4:49 PM, Veerabhadrarao Badiganti wrote:
The commit bbdc74dc19e0 ("mmc: block: Prevent new req entering queue
after its cleanup") has introduced this change but it got moved after
del_gendisk() with commit 57678e5a3d51 ("mmc: block: Delete gendisk
before cleaning up the request queue").

It is blocking reboot with below Call stack().

INFO: task reboot:3086 blocked for more than 122 seconds.
      __schedule
      schedule
      schedule_timeout
      io_schedule_timeout
      do_wait_for_common
      wait_for_completion_io
      submit_bio_wait
      blkdev_issue_flush
      ext4_sync_fs
      __sync_filesystem
      sync_filesystem
      fsync_bdev
      invalidate_partition
      del_gendisk
      mmc_blk_remove_req
      mmc_blk_remove
      mmc_bus_remove
      device_release_driver_internal
      device_release_driver
      bus_remove_device
      device_del
      mmc_remove_card
      mmc_remove
      mmc_stop_host
      mmc_remove_host
      sdhci_remove_host
      sdhci_msm_remove
      sdhci_msm_shutdown
      platform_drv_shutdown
      device_shutdown
      kernel_restart_prepare
      kernel_restart

So bringing this change back.

Signed-off-by: Veerabhadrarao Badiganti <vbadigan@xxxxxxxxxxxxxx>
---

I'm observing this issue 100% of the time with shutdown callback added to sdhci-msm driver.
I'm trying on 5.4 kernel with ChromeOS.

Please let me know if this can be fixed in a better way.
---

  drivers/mmc/core/block.c | 1 +
  1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 8d3df0be0355..76dbb2b8a13b 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2627,6 +2627,7 @@ static void mmc_blk_remove_req(struct mmc_blk_data *md)
  		 * from being accepted.
  		 */
  		card = md->queue.card;
+		blk_set_queue_dying(md->queue.queue);
  		if (md->disk->flags & GENHD_FL_UP) {
  			device_remove_file(disk_to_dev(md->disk), &md->force_ro);
  			if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&



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