[PATCH v2 0/2] net: qrtr: Drop the MHI 'auto_queue' feature

[Manivannan Sadhasivam via B4 Relay <devnull+manivannan.sadhasivam.oss.qualcomm.com@kernel.org>]

Hi,

This series intends to fix the race between the MHI stack and the MHI client
drivers due to the MHI 'auto_queue' feature. As it turns out often, the best
way to fix an issue in a feature is to drop the feature itself and this series
does exactly that.

There is no real benefit in having the 'auto_queue' feature in the MHI stack,
other than saving a few lines of code in the client drivers. Since the QRTR is
the only client driver which makes use of this feature, this series reworks the
QRTR driver to manage the buffer on its own.

Testing
=======

Tested on Qcom X1E based Lenovo Thinkpad T14s laptop with WLAN device.

Merge Strategy
==============

Since this series modifies many subsystem drivers, I'd like to get acks from
relevant subsystem maintainers and take the series through MHI tree.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
---
Changes in v2:
- Used mhi_get_free_desc_count() to queue the buffers
- Collected tags
- Link to v1: https://lore.kernel.org/r/20251217-qrtr-fix-v1-0-f6142a3ec9d8@oss.qualcomm.com

---
Manivannan Sadhasivam (2):
      net: qrtr: Drop the MHI auto_queue feature for IPCR DL channels
      bus: mhi: host: Drop the auto_queue support

 drivers/accel/qaic/mhi_controller.c   | 44 -------------------
 drivers/bus/mhi/host/init.c           | 10 -----
 drivers/bus/mhi/host/internal.h       |  3 --
 drivers/bus/mhi/host/main.c           | 81 +----------------------------------
 drivers/bus/mhi/host/pci_generic.c    | 20 +--------
 drivers/net/wireless/ath/ath11k/mhi.c |  4 --
 drivers/net/wireless/ath/ath12k/mhi.c |  4 --
 include/linux/mhi.h                   | 14 ------
 net/qrtr/mhi.c                        | 69 ++++++++++++++++++++++++-----
 9 files changed, 62 insertions(+), 187 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251217-qrtr-fix-c058251d8d1a

Best regards,
-- 
Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>