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greybus: loopback: add response len to loopback protocol

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This patch adds a len field to the loopback protocol.
This field is validated in gb_loopback_transfer() and stuffed in
gb_loopback_request_recv().

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Patrick Titiano <ptitiano@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Bryan O'Donoghue 2015-09-14 10:48:45 +01:00 committed by Greg Kroah-Hartman
parent f2cfa70439
commit 4a655ad4c2
2 changed files with 2 additions and 0 deletions
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1
drivers/staging/greybus/greybus_protocols.h
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@ -917,6 +917,7 @@ struct gb_loopback_transfer_request {
} __packed;
struct gb_loopback_transfer_response {
__le32 len;
__u8 data[0];
} __packed;

1
drivers/staging/greybus/loopback.c
View File

@ -524,6 +524,7 @@ static int gb_loopback_request_recv(u8 type, struct gb_operation *operation)
return -ENOMEM;
}
response = operation->response->payload;
response->len = cpu_to_le32(len);
memcpy(response->data, request->data, len);
}
return 0;