Syncing here is done with a semaphore declared on a function stack
and released in a callback. In case of a cancelled transfer (eg.
cable disconnect) the callback is never called.
The fix introduces a periodic check if a transfer is still valid.
Signed-off-by: Jan Pohanka <xhpohanka@gmail.com>
Parallel transfer to same endpoint is not supported and
may cause a deadlock. Adding a check to prevent starting
the transfer if tranfer is already ongoing on same endpoint.
Transfer status was not checked when accessing to transfer
from endpoint callback. Adding status check, to prevent
a double completion.
Fixes#30736
Signed-off-by: Kari Hulkko <kari.m.hulkko@gmail.com>
The USB infrastructure currently uses the system work queue for
offloading transfers, CDC-ACM UART transmission/reception, and device
firmware activities. This causes problems when the system work queue
is also used to initiate some activities (such as UART) that normally
complete without requiring an external thread: in that case the USB
infrastructure is prevented from making progress because the system
work queue is blocked waiting for the USB infrastructure to provide
data.
Break the dependency by allowing the USB infrastructure to use a
dedicated work queue which doesn't depend on availability of the
system work queue.
Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
This patch removes the hard-coded number of transfer buffers and allows
you to increase the number of transfer buffers when multiple USB
devices are used.
Signed-off-by: Pavel Král <pavel.kral@omsquare.com>
