remoteproc: qcom: Check subdev start status in rproc_stop()

For rproc that doing attach, rproc_start_subdevices() is called only when
attach successfully. If rproc_report_crash() is called in the attach
function, rproc_boot_recovery()->rproc_stop()->rproc_stop_subdevices()->
glink_subdev_stop() could be called and cause NULL pointer dereference:

 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000300
 Mem abort info:
 ...
 pc : qcom_glink_smem_unregister+0x14/0x48 [qcom_glink_smem]
 lr : glink_subdev_stop+0x1c/0x30 [qcom_common]
 ...
 Call trace:
  qcom_glink_smem_unregister+0x14/0x48 [qcom_glink_smem] (P)
  glink_subdev_stop+0x1c/0x30 [qcom_common]
  rproc_stop+0x58/0x17c
  rproc_trigger_recovery+0xb0/0x150
  rproc_crash_handler_work+0xa4/0xc4
  process_scheduled_works+0x18c/0x2d8
  worker_thread+0x144/0x280
  kthread+0x124/0x138
  ret_from_fork+0x10/0x20
 Code: a9be7bfd 910003fd a90153f3 aa0003f3 (b9430000)
 ---[ end trace 0000000000000000 ]---

Introduce "subdevs_started" flag to indicate rproc_start_subdevices() has
been called successfully. Ensure subdevices are only stopped if they have
been started.

Signed-off-by: Jingyi Wang <jingyi.wang@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260623-rproc-attach-issue-v3-2-8e24310707ce@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

0 files changed, 0 insertions, 0 deletions