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From: Julia Lawall on 15 May 2010 17:30
From: Julia Lawall <julia(a)diku.dk>

Use kmemdup when some other buffer is immediately copied into the
allocated region.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
statement S;
@@

- to = \(kmalloc\|kzalloc\)(size,flag);
+ to = kmemdup(from,size,flag);
if (to==NULL || ...) S
- memcpy(to, from, size);
// </smpl>

Signed-off-by: Julia Lawall <julia(a)diku.dk>

---
drivers/s390/char/keyboard.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff -u -p a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c
--- a/drivers/s390/char/keyboard.c
+++ b/drivers/s390/char/keyboard.c
@@ -59,12 +59,11 @@ kbd_alloc(void) {
goto out_kbd;
for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
if (key_maps[i]) {
- kbd->key_maps[i] =
- kmalloc(sizeof(u_short)*NR_KEYS, GFP_KERNEL);
+ kbd->key_maps[i] = kmemdup(key_maps[i],
+ sizeof(u_short) * NR_KEYS,
+ GFP_KERNEL);
if (!kbd->key_maps[i])
goto out_maps;
- memcpy(kbd->key_maps[i], key_maps[i],
- sizeof(u_short)*NR_KEYS);
}
}
kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL);
@@ -83,12 +82,11 @@ kbd_alloc(void) {
kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
if (!kbd->fn_handler)
goto out_func;
- kbd->accent_table =
- kmalloc(sizeof(struct kbdiacruc)*MAX_DIACR, GFP_KERNEL);
+ kbd->accent_table = kmemdup(accent_table,
+ sizeof(struct kbdiacruc) * MAX_DIACR,
+ GFP_KERNEL);
if (!kbd->accent_table)
goto out_fn_handler;
- memcpy(kbd->accent_table, accent_table,
- sizeof(struct kbdiacruc)*MAX_DIACR);
kbd->accent_table_size = accent_table_size;
return kbd;

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Prev: [PATCH 33/37] drivers/net/usb: Use kmemdup
Next: [PATCH 24/37] drivers/net/wireless/b43: Use kmemdup