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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6

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* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: Preserve response data alignment bug when it is harmless
This commit is contained in:
Linus Torvalds 2008-08-06 12:03:43 -07:00
commit a14ad05f47
1 changed files with 20 additions and 9 deletions
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27
drivers/firewire/fw-cdev.c
View file

@ -369,21 +369,32 @@ complete_transaction(struct fw_card *card, int rcode,
struct response *response = data;
struct client *client = response->client;
unsigned long flags;
struct fw_cdev_event_response *r = &response->response;
if (length < response->response.length)
response->response.length = length;
if (length < r->length)
r->length = length;
if (rcode == RCODE_COMPLETE)
memcpy(response->response.data, payload,
response->response.length);
memcpy(r->data, payload, r->length);
spin_lock_irqsave(&client->lock, flags);
list_del(&response->resource.link);
spin_unlock_irqrestore(&client->lock, flags);
response->response.type = FW_CDEV_EVENT_RESPONSE;
response->response.rcode = rcode;
queue_event(client, &response->event, &response->response,
sizeof(response->response) + response->response.length,
r->type = FW_CDEV_EVENT_RESPONSE;
r->rcode = rcode;
/*
* In the case that sizeof(*r) doesn't align with the position of the
* data, and the read is short, preserve an extra copy of the data
* to stay compatible with a pre-2.6.27 bug. Since the bug is harmless
* for short reads and some apps depended on it, this is both safe
* and prudent for compatibility.
*/
if (r->length <= sizeof(*r) - offsetof(typeof(*r), data))
queue_event(client, &response->event, r, sizeof(*r),
r->data, r->length);
else
queue_event(client, &response->event, r, sizeof(*r) + r->length,
NULL, 0);
}