Amit and Johan both reported a NULL pointer dereference in the pmic_glink client code during initialization, and Stephen Boyd pointed out the problem (race condition).
While investigating, and writing the fix, I noticed that ucsi_unregister() is called in atomic context but tries to sleep, and I also noticed that the condition for when to inform the pmic_glink client drivers when the remote has gone down is just wrong.
So, let's fix all three.
As mentioned in the commit message for the UCSI fix, I have a series in the works that makes the GLINK callback happen in a sleepable context, which would remove the need for the clients list to be protected by a spinlock, and removing the work scheduling. This is however not -rc material...
In addition to the NULL pointer dereference, there is the -ECANCELED issue reported here: https://lore.kernel.org/all/Zqet8iInnDhnxkT9@hovoldconsulting.com/ Johan reports that these fixes do not address that issue.
Signed-off-by: Bjorn Andersson quic_bjorande@quicinc.com --- Changes in v2: - Refer to the correct commit in the ucsi_unregister() patch. - Updated wording in the same commit message about the new error message in the log. - Changed the data type of the introduced state variables, opted to go for a bool as we only represent two states (and I would like to further clean this up going forward) - Initialized the spinlock - Link to v1: https://lore.kernel.org/r/20240818-pmic-glink-v6-11-races-v1-0-f87c577e0bc9@...
--- Bjorn Andersson (3): soc: qcom: pmic_glink: Fix race during initialization usb: typec: ucsi: Move unregister out of atomic section soc: qcom: pmic_glink: Actually communicate with remote goes down
drivers/power/supply/qcom_battmgr.c | 16 ++++++++----- drivers/soc/qcom/pmic_glink.c | 40 ++++++++++++++++++++++---------- drivers/soc/qcom/pmic_glink_altmode.c | 17 +++++++++----- drivers/usb/typec/ucsi/ucsi_glink.c | 43 ++++++++++++++++++++++++++--------- include/linux/soc/qcom/pmic_glink.h | 11 +++++---- 5 files changed, 87 insertions(+), 40 deletions(-) --- base-commit: 2fd613d27928293eaa87788b10e8befb6805cd42 change-id: 20240818-pmic-glink-v6-11-races-363f5964c339
Best regards,