util/agents/usb_hid_relay: fix concurrent access #1526
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Since c9fc5bf, it was no longer possible to use the same USB relay device from multiple labgrid processes, as the USB device was kept open and claimed. To fix this, we use a context manager which first claims the USB interface (with retry while busy) and releases it after the transaction. With this fix, multiple processes can toggle outputs in a busy loop without causing 'USBError(16, 'Resource busy')' failures. Fixes: c9fc5bf ("labgrid/util/agents/usb_hid_relay: keep the USB device open") Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #1526 +/- ##
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- Coverage 61.8% 56.7% -5.2%
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Files 166 168 +2
Lines 12305 13022 +717
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- Hits 7605 7384 -221
- Misses 4700 5638 +938 ☔ View full report in Codecov by Sentry. |
Bastian-Krause
approved these changes
Oct 15, 2024
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Since c9fc5bf, it was no longer possible to use the same USB relay device from multiple labgrid processes, as the USB device was kept open and claimed.
To fix this, we use a context manager which first claims the USB interface (with retry while busy) and releases it after the transaction.
With this fix, multiple processes can toggle outputs in a busy loop without causing 'USBError(16, 'Resource busy')' failures.
Fixes: c9fc5bf ("labgrid/util/agents/usb_hid_relay: keep the USB device open")