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firewire: Move fw_card kref functions into linux/firewire.h
When writing a firewire driver that doesn't deal with struct fw_device objects (e.g. it only publishes FireWire units and doesn't subscribe to them), you likely need to keep referenced to struct fw_card objects so that you can send messages to other nodes. This patch moves fw_card_put(), fw_card_get() and fw_card_release() into the public include/linux/firewire.h header instead of drivers/firewire/core.h, and adds EXPORT_SYMBOL_GPL(fw_card_release). The firewire-sbp-target module requires these so it can keep a reference to the fw_card object in order that it can fetch ORBs to execute and read/write related data and status information. Signed-off-by: Chris Boot <firstname.lastname@example.org> Acked-by: Stefan Richter <email@example.com> Cc: Clemens Ladisch <firstname.lastname@example.org> Signed-off-by: Nicholas Bellinger <email@example.com>
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