diff options
| author | David Woodhouse <dwmw2@infradead.org> | 2007-12-19 13:03:19 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 15:07:51 -0800 |
| commit | f15ebb63b36eca5fa68fabd04ab2f7840bc67205 (patch) | |
| tree | 6b2952b6744062e8487646d08e55eb04c87e2d83 /drivers/net/wireless/libertas/cmd.h | |
| parent | 4f59abf190b15350167bec5382dda205030ac9d0 (diff) | |
libertas: change inference about buffer size in lbs_cmd()
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@infradead.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/libertas/cmd.h')
| -rw-r--r-- | 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 6efb81ec597..b9ab85cc791 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)) |