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authorStefan Richter <stefanr@s5r6.in-berlin.de>2010-07-18 12:44:01 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2010-07-23 13:36:27 +0200
commit18d0cdfd1a4cc9028c0ef80f94538b31541f8fe5 (patch)
treec28db7537da311e59e871aba7f6f0edaa46535b9 /drivers/firewire/core-transaction.c
parent80792d182e43bee89fce509e64fdea27e600530f (diff)
firewire: normalize status values in packet callbacks
core-transaction.c transmit_complete_callback() and close_transaction() expect packet callback status to be an ACK or RCODE, and ACKs get translated to RCODEs for transaction callbacks. An old comment on the packet callback API (been there from the initial submission of the stack) and the dummy_driver implementation of send_request/send_response deviated from this as they also included -ERRNO in the range of status values. Let's narrow status values down to ACK and RCODE to prevent surprises. RCODE_CANCELLED is chosen as the dummy_driver's RCODE as its meaning of "transaction timed out" comes closest to what happens when a transaction coincides with card removal. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire/core-transaction.c')
-rw-r--r--drivers/firewire/core-transaction.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 5f5a7852f7a..e2e4dc624fb 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -310,7 +310,10 @@ static int allocate_tlabel(struct fw_card *card)
* After the transaction is completed successfully or unsuccessfully, the
* @callback will be called. Among its parameters is the response code which
* is either one of the rcodes per IEEE 1394 or, in case of internal errors,
- * the firewire-core specific %RCODE_SEND_ERROR.
+ * the firewire-core specific %RCODE_SEND_ERROR. The other firewire-core
+ * specific rcodes (%RCODE_CANCELLED, %RCODE_BUSY, %RCODE_GENERATION,
+ * %RCODE_NO_ACK) denote transaction timeout, busy responder, stale request
+ * generation, or missing ACK respectively.
*
* Note some timing corner cases: fw_send_request() may complete much earlier
* than when the request packet actually hits the wire. On the other hand,