Re: [PATCH 5.15.y] usb: typec: ucsi: displayport: Fix deadlock

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

Summary of potential issues:
⚠️ Found matching upstream commit but patch is missing proper reference to it

Found matching upstream commit: 364618c89d4c57c85e5fc51a2446cd939bf57802

Status in newer kernel trees:
6.14.y | Present (different SHA1: 61fc1a8e1e10)
6.12.y | Not found
6.6.y | Not found
6.1.y | Not found

Note: The patch differs from the upstream commit:
---
1:  364618c89d4c5 ! 1:  caf9dc6a5a533 usb: typec: ucsi: displayport: Fix deadlock
    @@ Commit message
         Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
         Link: https://lore.kernel.org/r/20250424084429.3220757-2-akuchynski@chromium.org
         Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    +    (cherry picked from commit 364618c89d4c57c85e5fc51a2446cd939bf57802)
     
      ## drivers/usb/typec/ucsi/displayport.c ##
     @@ drivers/usb/typec/ucsi/displayport.c: static int ucsi_displayport_enter(struct typec_altmode *alt, u32 *vdo)
    @@ drivers/usb/typec/ucsi/ucsi.c: void ucsi_set_drvdata(struct ucsi *ucsi, void *da
     +
     +	while (connected && !mutex_locked) {
     +		mutex_locked = mutex_trylock(&con->lock) != 0;
    -+		connected = UCSI_CONSTAT(con, CONNECTED);
    ++		connected = con->status.flags & UCSI_CONSTAT_CONNECTED;
     +		if (connected && !mutex_locked)
     +			msleep(20);
     +	}
    @@ drivers/usb/typec/ucsi/ucsi.c: void ucsi_set_drvdata(struct ucsi *ucsi, void *da
       * @dev: Device interface to the PPM (Platform Policy Manager)
     
      ## drivers/usb/typec/ucsi/ucsi.h ##
    +@@
    + 
    + struct ucsi;
    + struct ucsi_altmode;
    ++struct ucsi_connector;
    + 
    + /* UCSI offsets (Bytes) */
    + #define UCSI_VERSION			0
     @@ drivers/usb/typec/ucsi/ucsi.h: int ucsi_register(struct ucsi *ucsi);
      void ucsi_unregister(struct ucsi *ucsi);
      void *ucsi_get_drvdata(struct ucsi *ucsi);
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-5.15.y       |  Success    |  Success   |