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Fri, 10 Apr 2026 02:56:04 -0700 (PDT) X-Received: by 2002:a17:902:d50a:b0:2ae:c358:bb7c with SMTP id d9443c01a7336-2b2d5a4a515mr27985135ad.35.1775814964368; Fri, 10 Apr 2026 02:56:04 -0700 (PDT) Received: from [10.239.97.158] ([114.94.8.21]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b2d4ddb462sm23812085ad.24.2026.04.10.02.56.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Apr 2026 02:56:03 -0700 (PDT) Message-ID: Date: Fri, 10 Apr 2026 17:55:58 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6] Bluetooth: qca: Fix delayed hw_error handling due to missing wakeup during SSR To: Paul Menzel Cc: Bartosz Golaszewski , Marcel Holtmann , Luiz Augusto von Dentz , linux-arm-msm@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, cheng.jiang@oss.qualcomm.com, quic_chezhou@quicinc.com, wei.deng@oss.qualcomm.com, jinwang.li@oss.qualcomm.com, mengshi.wu@oss.qualcomm.com, Bartosz Golaszewski References: <20260410085202.4128000-1-shuai.zhang@oss.qualcomm.com> <489d33f4-16a1-430c-9ec6-7f13a8f2f995@molgen.mpg.de> Content-Language: en-US From: Shuai Zhang In-Reply-To: <489d33f4-16a1-430c-9ec6-7f13a8f2f995@molgen.mpg.de> Content-Type: text/plain; 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I have updated it in v7. On 4/10/2026 5:38 PM, Paul Menzel wrote: > Dear Shuai, > > > Thank you for your patch. Just some last style things. It’d be great > if you could re-flow the commit message to 75 characters per line. > This would save some lines. > > Am 10.04.26 um 10:52 schrieb Shuai Zhang: >> When Bluetooth controller encounters a coredump, it triggers >> the Subsystem Restart (SSR) mechanism. The controller first >> reports the coredump data, and once the data upload is complete, >> it sends a hw_error event. The host relies on this event to >> proceed with subsequent recovery actions. >> >> If the host has not finished processing the coredump data >> when the hw_error event is received, >> it sets a timer to wait until either the data processing is complete >> or the timeout expires before handling the event. > > Maybe mention the timer value? > >> The current implementation lacks a wakeup trigger. As a result, >> even if the coredump data has already been processed, the host >> continues to wait until the timer expires, causing unnecessary >> delays in handling the hw_error event. >> >> To fix this issue, adds a `wake_up_bit()` call after the host finishes > > s/adds/add/ > > Now that you use `clear_and_wake_up_bit()`, this might confuse > readers. Maybe: > > To fix this issue, also wake up the other thread by using > `clear_and_wake_up_bit()`. > > Feel free to ignore though. > >> processing the coredump data. This ensures that the waiting thread is >> promptly notified and can proceed to handle the hw_error event without >> waiting for the timeout. >> >> Test case: >> - Trigger controller coredump using the command: `hcitool cmd 0x3f 0c >> 26`. > > It’d be great if you mentioned one affected controller. > >> - Use `btmon` to capture HCI logs. >> - Observe the time interval between receiving the hw_error event >> and the execution of the power-off sequence in the HCI log. > > Please paste the logs. > >> Reviewed-by: Bartosz Golaszewski >> Signed-off-by: Shuai Zhang >> --- >> Changes v6: >> - Replace wake_up_bit with clear_and_wake_up_bit >> - Link to v5 >> https://lore.kernel.org/all/20260409112233.3326467-1-shuai.zhang@oss.qualcomm.com/ >> >> Changes v5: >> - Replace clear_and_wake_up_bit with wake_up_bit >> - Link to v4 >> https://lore.kernel.org/all/20260327083258.1398450-1-shuai.zhang@oss.qualcomm.com/ >> >> Changes v4: >> - add Acked-by signoff >> - Link to v3 >> https://lore.kernel.org/all/20251107033924.3707495-1-quic_shuaz@quicinc.com/ >> >> Changes v3: >> - add Fixes tag >> - Link to v2 >> https://lore.kernel.org/all/20251106140103.1406081-1-quic_shuaz@quicinc.com/ >> >> Changes v2: >> - Split timeout conversion into a separate patch. >> - Clarified commit messages and added test case description. >> - Link to v1 >> https://lore.kernel.org/all/20251104112601.2670019-1-quic_shuaz@quicinc.com/ >> --- >>   drivers/bluetooth/hci_qca.c | 4 ++-- >>   1 file changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c >> index c17a462ae..228a754a9 100644 >> --- a/drivers/bluetooth/hci_qca.c >> +++ b/drivers/bluetooth/hci_qca.c >> @@ -1108,7 +1108,7 @@ static void qca_controller_memdump(struct >> work_struct *work) >>                   qca->qca_memdump = NULL; >>                   qca->memdump_state = QCA_MEMDUMP_COLLECTED; >> cancel_delayed_work(&qca->ctrl_memdump_timeout); >> -                clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags); >> +                clear_and_wake_up_bit(QCA_MEMDUMP_COLLECTION, >> &qca->flags); >>                   clear_bit(QCA_IBS_DISABLED, &qca->flags); >>                   mutex_unlock(&qca->hci_memdump_lock); >>                   return; >> @@ -1186,7 +1186,7 @@ static void qca_controller_memdump(struct >> work_struct *work) >>               kfree(qca->qca_memdump); >>               qca->qca_memdump = NULL; >>               qca->memdump_state = QCA_MEMDUMP_COLLECTED; >> -            clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags); >> +            clear_and_wake_up_bit(QCA_MEMDUMP_COLLECTION, &qca->flags); >>           } >>             mutex_unlock(&qca->hci_memdump_lock); > > With the comments above addressed: > > Reviewed-by: Paul Menzel > > > Kind regards, > > Paul > > > PS: gemini/gemini-3.1-pro-preview has some unrelated(?) comments [1]. > It’d be great if Qualcomm could look into this. > > > [1]: > https://sashiko.dev/#/patchset/20260410085202.4128000-1-shuai.zhang%40oss.qualcomm.com > Thanks， shuai