wifi: ath11k: fix NULL dereference in ahb remove when QMI init incomplete

On WCN6750, if QMI messages never arrive (for example when qrtr_smd
is not ready), WLAN initialization stops before the device is fully
registered. In this case ATH11K_FLAG_QMI_FAIL is not set because no
QMI event handler is executed.

When the driver is removed, ath11k_ahb_remove() still calls
ath11k_core_deinit(), which eventually triggers
ath11k_ce_cleanup_pipes() on uninitialized CE pipes and results in a
NULL pointer dereference in ath11k_hal_srng_access_begin():

  ath11k_hal_srng_access_begin+0x14/0x68 [ath11k]
  ath11k_ce_cleanup_pipes+0x184/0x190 [ath11k]
  ath11k_pcic_stop+0x24/0x38 [ath11k]
  ath11k_core_deinit+0xfc/0x1c0 [ath11k]
  ath11k_ahb_remove+0x38/0xa0 [ath11k_ahb]

Fix this by invoking ath11k_ahb_remove_prepare() before the state
check and skipping ath11k_core_deinit() if ATH11K_FLAG_REGISTERED
is not set, core initialization did not complete and CE pipes may
remain uninitialized, making ath11k_core_deinit() unsafe.

Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.2.0.c2-00204-QCAMSLSWPLZ-1

Fixes: 00402f49d26f ("ath11k: Add support for WCN6750 device")
Signed-off-by: Miaoqing Pan <miaoqing.pan@oss.qualcomm.com>
Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>
Reviewed-by: Rameshkumar Sundaram <rameshkumar.sundaram@oss.qualcomm.com>
Link: https://patch.msgid.link/20260806101331.484063-3-miaoqing.pan@oss.qualcomm.com
Signed-off-by: Jeff Johnson <jeff.johnson@oss.qualcomm.com>

0 files changed, 0 insertions, 0 deletions