Re: 2.6.21-rc2-mm2: drivers/net/wireless/libertas/debugfs.c addr bogosity

Tony Breeds
2007-03-09T02:11:50Z

On Wed, Mar 07, 2007 at 03:00:57PM -0800, Andrew Morton wrote:
> On Wed, 7 Mar 2007 23:41:16 +0100
> Adrian Bunk <bunk@stusta.de> wrote:
>
> > On Tue, Mar 06, 2007 at 12:44:08AM -0800, Andrew Morton wrote:
> > >...
> > > Changes since 2.6.20-rc2-mm1:
> > >...
> > > git-netdev-all.patch
> > >...
> > > git trees
> > >...
> >
> > drivers/net/wireless/libertas/debugfs.c contains:
> > #define item_addr(n) ((u32) &((wlan_adapter *)0)->n)
> >
> > This is wrong on 64bit architectures.
>
> Is OK - it is simply yet another reimplementation of offsetof(). Hint.

Perhaps something like?

Against 2.6.21-rc3-mm2

From: Tony Breeds <tony@bakeyournoodle.com>

Cleanup drivers/net/wireless/libertas/debugfs.c to use standard kernel macros and functions.

Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>

---
only compile tested on x86

debugfs.c | 41 ++++-------------------------------------
1 file changed, 4 insertions(+), 37 deletions(-)

diff --git a/drivers/net/wireless/libertas/debugfs.c b/drivers/net/wireless/libertas/debugfs.c
index 3ad1e03..51dfd20 100644
--- a/drivers/net/wireless/libertas/debugfs.c
+++ b/drivers/net/wireless/libertas/debugfs.c
@@ -1772,8 +1772,8 @@ void libertas_debugfs_remove_one(wlan_private *priv)

/* debug entry */

-#define item_size(n) (sizeof ((wlan_adapter *)0)->n)
-#define item_addr(n) ((u32) &((wlan_adapter *)0)->n)
+#define item_size(n) (FIELD_SIZEOF(wlan_adapter, n))
+#define item_addr(n) (offsetof(wlan_adapter, n))

struct debug_data {
char name[32];
@@ -1789,40 +1789,7 @@ static struct debug_data items[] = {
{"psstate", item_size(psstate), item_addr(psstate)},
};

-static int num_of_items = sizeof(items) / sizeof(items[0]);
-
-/**
- * @brief convert string to number
- *
- * @param s pointer to numbered string
- * @return converted number from string s
- */
-static int string_to_number(char *s)
-{
- int r = 0;
- int base = 0;
-
- if ((strncmp(s, "0x", 2) == 0) || (strncmp(s, "0X", 2) == 0))
- base = 16;
- else
- base = 10;
-
- if (base == 16)
- s += 2;
-
- for (s = s; *s != 0; s++) {
- if ((*s >= 48) && (*s <= 57))
- r = (r * base) + (*s - 48);
- else if ((*s >= 65) && (*s <= 70))
- r = (r * base) + (*s - 55);
- else if ((*s >= 97) && (*s <= 102))
- r = (r * base) + (*s - 87);
- else
- break;
- }
-
- return r;
-}
+static int num_of_items = ARRAY_SIZE(items);

/**
* @brief proc read function
@@ -1912,7 +1879,7 @@ static int wlan_debugfs_write(struct file *f, const char __user *buf,
if (!p2)
break;
p2++;
- r = string_to_number(p2);
+ r = simple_strtoul(p2, NULL, 0);
if (d[i].size == 1)
*((u8 *) d[i].addr) = (u8) r;
else if (d[i].size == 2)
Yours Tony

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