[PATCH v2 0/6] Fix possible NULL-deref and runtime PM race conditions

Loic Poulain loic.poulain at oss.qualcomm.com
Wed Jan 21 06:28:21 PST 2026


Address potential NULL pointer dereferences and race conditions related
to runtime PM in several Qualcomm PHY drivers. In all cases, enabling
runtime PM before the PHY instance is fully initialized can lead to
crashes during early runtime suspend callbacks.

- Attach driver data before enabling runtime PM.
- Introduce initialization flags where needed to avoid dereferencing
uninitialized pointers.
- Reorder pm_runtime_enable() and pm_runtime_forbid() calls to prevent
unnecessary suspend/resume cycles during driver probe.
- Use devres-managed PM runtime helpers for proper cleanup.

Changes in V2:
Split patches 2/4 and 3/4 so that the null‑pointer dereference fix and
the runtime‑PM enable/forbid reordering are logically separated.

Loic Poulain (6):
  phy: qcom: qmp-combo: Prevent unnecessary PM runtime suspend at boot
  phy: qcom: qmp-usbc: Fix possible NULL-deref on early runtime suspend
  phy: qcom: qmp-usbc: Prevent unnecessary PM runtime suspend at boot
  phy: qcom: qmp-usb-legacy: Fix possible NULL-deref on early runtime
    suspend
  phy: qcom: qmp-usb-legacy: Prevent unnecessary PM runtime suspend at
    boot
  phy: qcom: snps-femto-v2: Fix possible NULL-deref on early runtime
    suspend

 drivers/phy/qualcomm/phy-qcom-qmp-combo.c     | 10 ++++-----
 .../phy/qualcomm/phy-qcom-qmp-usb-legacy.c    | 21 ++++++++++++-------
 drivers/phy/qualcomm/phy-qcom-qmp-usbc.c      | 14 ++++++-------
 drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 15 ++++++-------
 4 files changed, 34 insertions(+), 26 deletions(-)

-- 
2.34.1




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