Date: Wed, 19 Dec 2007 13:03:19 +0000
sizeof(*cmd) is going to give the total size of the data structure that
we allocated, more often than not. But the size of the command to be
_sent_ could be a lot smaller, as it is in the KEY_MATERIAL and
SUBSCRIBE_EVENT commands for example. So swap them round; let the caller
set the _command_ size explicitly in the header, and infer the
maximum response size from the data structure.
Signed-off-by: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
---
drivers/net/wireless/libertas/cmd.h | 14 ++++++++------
1 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/net/wireless/libertas/cmd.h b/drivers/net/wireless/libertas/cmd.h
index 6efb81e..b9ab85c 100644
--- a/drivers/net/wireless/libertas/cmd.h
+++ b/drivers/net/wireless/libertas/cmd.h
@@ -6,13 +6,15 @@
#include "hostcmd.h"
#include "dev.h"
-#define lbs_cmd(priv, cmdnr, cmd, cb, cb_arg) \
- __lbs_cmd(priv, cmdnr, &(cmd)->hdr, sizeof(*(cmd)), cb, cb_arg)
+/* lbs_cmd() infers the size of the buffer to copy data back into, from
+ the size of the target of the pointer. Since the command to be sent
+ may often be smaller, that size is set in cmd->size by the caller.*/
+#define lbs_cmd(priv, cmdnr, cmd, cb, cb_arg) ({ \
+ uint16_t __sz = le16_to_cpu((cmd)->hdr.size); \
+ (cmd)->hdr.size = cpu_to_le16(sizeof(*(cmd))); \
+ __lbs_cmd(priv, cmdnr, &(cmd)->hdr, __sz, cb, cb_arg); \
+})
-
-/* lbs_cmd_with_response() infers the size of the command to be _sent_
- and requires that the caller sets cmd->size to the (LE) size of
- the _response_ buffer. */
#define lbs_cmd_with_response(priv, cmdnr, cmd) \
lbs_cmd(priv, cmdnr, cmd, lbs_cmd_copyback, (unsigned long) (cmd))
--
1.5.3.4
-
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