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authorClemens Ladisch <cladisch@fastmail.net>2009-12-24 12:05:58 +0100
committerStefan Richter <stefanr@s5r6.in-berlin.de>2009-12-29 19:58:16 +0100
commitdb5d247ae811f49185a71e703b65acad845e4b18 (patch)
tree630586f3bdeea2df01c349d3cf27fb2e6317370c /include/linux/firewire.h
parent6b7b284958d47b77d06745b36bc7f36dab769d9b (diff)
firewire: fix use of multiple AV/C devices, allow multiple FCP listeners
Control of more than one AV/C device at once --- e.g. camcorders, tape decks, audio devices, TV tuners --- failed or worked only unreliably, depending on driver implementation. This affected kernelspace and userspace drivers alike and was caused by firewire-core's inability to accept multiple registrations of FCP listeners. The fix allows multiple address handlers to be registered for the FCP command and response registers. When a request for these registers is received, all handlers are invoked, and the Firewire response is generated by the core and not by any handler. The cdev API does not change, i.e., userspace is still expected to send a response for FCP requests; this response is silently ignored. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (changelog, rebased, whitespace)
Diffstat (limited to 'include/linux/firewire.h')
-rw-r--r--include/linux/firewire.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index 9416a461b696..a0e67150a729 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -248,8 +248,8 @@ typedef void (*fw_transaction_callback_t)(struct fw_card *card, int rcode,
void *data, size_t length,
void *callback_data);
/*
- * Important note: The callback must guarantee that either fw_send_response()
- * or kfree() is called on the @request.
+ * Important note: Except for the FCP registers, the callback must guarantee
+ * that either fw_send_response() or kfree() is called on the @request.
*/
typedef void (*fw_address_callback_t)(struct fw_card *card,
struct fw_request *request,

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