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由 Alan Stern 提交于
Now that URBs can be completed inside tasklets, we need a way of determining whether a completion handler for a given endpoint is currently running. Otherwise it's not possible to maintain the API guarantee about keeping isochronous streams synchronous when an underrun occurs. This patch adds a field and a routine to check whether a completion handler for a periodic endpoint is running. At the moment no analogous routine appears to be necessary for async endpoints, but one can always be added. Signed-off-by: NAlan Stern <stern@rowland.harvard.edu> CC: Ming Lei <tom.leiming@gmail.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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