The existing memstick core patch: commit 62c59a8786e6 ("memstick: Skip
allocating card when removing host") sets host->removing in
memstick_remove_host(),but still exists a critical time window where
memstick_check can run after host->eject is set but before removing is set.

In the rtsx_usb_ms driver, the problematic sequence is:

rtsx_usb_ms_drv_remove:          memstick_check:
  host->eject = true
  cancel_work_sync(handle_req)     if(!host->removing)
  ...                              memstick_alloc_card()
                                     memstick_set_rw_addr()
                                       memstick_new_req()
                                         rtsx_usb_ms_request()
                                           if(!host->eject)
                                           skip schedule_work
                                       wait_for_completion()
  memstick_remove_host:                [blocks indefinitely]
    host->removing = true
    flush_workqueue()
    [block]

1. rtsx_usb_ms_drv_remove sets host->eject = true
2. cancel_work_sync(&host->handle_req) runs
3. memstick_check work may be executed here <-- danger window
4. memstick_remove_host sets removing = 1

During this window (step 3), memstick_check calls memstick_alloc_card,
which may indefinitely waiting for mrq_complete completion that will
never occur because rtsx_usb_ms_request sees eject=true and skips
scheduling work, memstick_set_rw_addr waits forever for completion.

This causes a deadlock when memstick_remove_host tries to flush_workqueue,
waiting for memstick_check to complete, while memstick_check is blocked
waiting for mrq_complete completion.

Fix this by setting removing=true at the start of rtsx_usb_ms_drv_remove,
before any work cancellation. This ensures memstick_check will see the
removing flag immediately and exit early, avoiding the deadlock.

Fixes: 62c59a8786e6 ("memstick: Skip allocating card when removing host")
Signed-off-by: Jiayi Li <lijiayi@kylinos.cn>
Cc: stable@vger.kernel.org

---
v1 -> v2:
Added Cc: stable@vger.kernel.org
---
 drivers/memstick/core/memstick.c    | 1 -
 drivers/memstick/host/rtsx_usb_ms.c | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
index 043b9ec756ff..95e65f4958f2 100644
--- a/drivers/memstick/core/memstick.c
+++ b/drivers/memstick/core/memstick.c
@@ -555,7 +555,6 @@ EXPORT_SYMBOL(memstick_add_host);
  */
 void memstick_remove_host(struct memstick_host *host)
 {
-	host->removing = 1;
 	flush_workqueue(workqueue);
 	mutex_lock(&host->lock);
 	if (host->card)
diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
index 3878136227e4..5b5e9354fb2e 100644
--- a/drivers/memstick/host/rtsx_usb_ms.c
+++ b/drivers/memstick/host/rtsx_usb_ms.c
@@ -812,6 +812,7 @@ static void rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 	int err;
 
 	host->eject = true;
+	msh->removing = true;
 	cancel_work_sync(&host->handle_req);
 	cancel_delayed_work_sync(&host->poll_card);
 
-- 
2.47.1

On Mon, 4 Aug 2025 at 03:36, Jiayi Li <lijiayi@kylinos.cn> wrote:
>
> The existing memstick core patch: commit 62c59a8786e6 ("memstick: Skip
> allocating card when removing host") sets host->removing in
> memstick_remove_host(),but still exists a critical time window where
> memstick_check can run after host->eject is set but before removing is set.
>
> In the rtsx_usb_ms driver, the problematic sequence is:
>
> rtsx_usb_ms_drv_remove:          memstick_check:
>   host->eject = true
>   cancel_work_sync(handle_req)     if(!host->removing)
>   ...                              memstick_alloc_card()
>                                      memstick_set_rw_addr()
>                                        memstick_new_req()
>                                          rtsx_usb_ms_request()
>                                            if(!host->eject)
>                                            skip schedule_work
>                                        wait_for_completion()
>   memstick_remove_host:                [blocks indefinitely]
>     host->removing = true
>     flush_workqueue()
>     [block]
>
> 1. rtsx_usb_ms_drv_remove sets host->eject = true
> 2. cancel_work_sync(&host->handle_req) runs
> 3. memstick_check work may be executed here <-- danger window
> 4. memstick_remove_host sets removing = 1
>
> During this window (step 3), memstick_check calls memstick_alloc_card,
> which may indefinitely waiting for mrq_complete completion that will
> never occur because rtsx_usb_ms_request sees eject=true and skips
> scheduling work, memstick_set_rw_addr waits forever for completion.
>
> This causes a deadlock when memstick_remove_host tries to flush_workqueue,
> waiting for memstick_check to complete, while memstick_check is blocked
> waiting for mrq_complete completion.
>
> Fix this by setting removing=true at the start of rtsx_usb_ms_drv_remove,
> before any work cancellation. This ensures memstick_check will see the
> removing flag immediately and exit early, avoiding the deadlock.
>
> Fixes: 62c59a8786e6 ("memstick: Skip allocating card when removing host")
> Signed-off-by: Jiayi Li <lijiayi@kylinos.cn>
> Cc: stable@vger.kernel.org

Applied for fixes, thanks!

Kind regards
Uffe


>
> ---
> v1 -> v2:
> Added Cc: stable@vger.kernel.org
> ---
>  drivers/memstick/core/memstick.c    | 1 -
>  drivers/memstick/host/rtsx_usb_ms.c | 1 +
>  2 files changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/memstick/core/memstick.c b/drivers/memstick/core/memstick.c
> index 043b9ec756ff..95e65f4958f2 100644
> --- a/drivers/memstick/core/memstick.c
> +++ b/drivers/memstick/core/memstick.c
> @@ -555,7 +555,6 @@ EXPORT_SYMBOL(memstick_add_host);
>   */
>  void memstick_remove_host(struct memstick_host *host)
>  {
> -       host->removing = 1;
>         flush_workqueue(workqueue);
>         mutex_lock(&host->lock);
>         if (host->card)
> diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
> index 3878136227e4..5b5e9354fb2e 100644
> --- a/drivers/memstick/host/rtsx_usb_ms.c
> +++ b/drivers/memstick/host/rtsx_usb_ms.c
> @@ -812,6 +812,7 @@ static void rtsx_usb_ms_drv_remove(struct platform_device *pdev)
>         int err;
>
>         host->eject = true;
> +       msh->removing = true;
>         cancel_work_sync(&host->handle_req);
>         cancel_delayed_work_sync(&host->poll_card);
>
> --
> 2.47.1
>