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Sun, 18 Aug 2024 23:17:38 GMT Received: from hu-bjorande-lv.qualcomm.com (10.49.16.6) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Sun, 18 Aug 2024 16:17:37 -0700 From: Bjorn Andersson Subject: [PATCH 0/3] soc: qcom: pmic_glink: v6.11-rc bug fixes Date: Sun, 18 Aug 2024 16:17:36 -0700 Message-ID: <20240818-pmic-glink-v6-11-races-v1-0-f87c577e0bc9@quicinc.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIABCBwmYC/x3MQQqAIBBA0avIrBvILNGuEi3CphoqCwUJwrsnL d/i/xciBaYIvXghUOLIly+QlQC3TX4l5LkYmrppayMN3ic7XA/2OyaNUmKYHEVUWi2d1a1TykK J70ALP/94GHP+ALqRDc5oAAAA To: Sebastian Reichel , Bjorn Andersson , Konrad Dybcio , "Heikki Krogerus" , Greg Kroah-Hartman , Neil Armstrong CC: Johan Hovold , Chris Lew , Dmitry Baryshkov , Stephen Boyd , Amit Pundir , , , , , Bjorn Andersson , Johan Hovold , X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; 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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/ I have not yet been able to either reproduce this or convince myself that this is the same issue. Signed-off-by: Bjorn Andersson Tested-by: Amit Pundir --- 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 | 44 ++++++++++++++++++++++++++--------- include/linux/soc/qcom/pmic_glink.h | 11 +++++---- 5 files changed, 88 insertions(+), 40 deletions(-) --- base-commit: 296c871d2904cff2b4742702ef94512ab467a8e3 change-id: 20240818-pmic-glink-v6-11-races-363f5964c339 Best regards,