FORMLIST: drivers: bluetooth: hci_qca: Fix delayed hw_error handling due to missing wakeup during SSR #536
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…due to missing wakeup during SSR 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. 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 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`. - 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. Signed-off-by: Shuai Zhang <[email protected]> Link: https://lore.kernel.org/all/[email protected]
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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.
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 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:
hcitool cmd 0x3f 0c 26.btmonto capture HCI logs.Signed-off-by: Shuai Zhang [email protected]
Link: https://lore.kernel.org/all/[email protected]