2010-05-15 21:17:03

by Julia Lawall

Subject: [PATCH 13/37] drivers/net/wireless/iwmc3200wifi: Use kmemdup

From: Julia Lawall <[email protected]>

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 <[email protected]>

---
drivers/net/wireless/iwmc3200wifi/rx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff -u -p a/drivers/net/wireless/iwmc3200wifi/rx.c b/drivers/net/wireless/iwmc3200wifi/rx.c
--- a/drivers/net/wireless/iwmc3200wifi/rx.c
+++ b/drivers/net/wireless/iwmc3200wifi/rx.c
@@ -321,14 +321,14 @@ iwm_rx_ticket_node_alloc(struct iwm_priv
return ERR_PTR(-ENOMEM);
}

- ticket_node->ticket = kzalloc(sizeof(struct iwm_rx_ticket), GFP_KERNEL);
+ ticket_node->ticket = kmemdup(ticket, sizeof(struct iwm_rx_ticket),
+ GFP_KERNEL);
if (!ticket_node->ticket) {
IWM_ERR(iwm, "Couldn't allocate RX ticket\n");
kfree(ticket_node);
return ERR_PTR(-ENOMEM);
}

- memcpy(ticket_node->ticket, ticket, sizeof(struct iwm_rx_ticket));
INIT_LIST_HEAD(&ticket_node->node);

return ticket_node;

2010-05-16 23:01:10

by Samuel Ortiz

Subject: Re: [PATCH 13/37] drivers/net/wireless/iwmc3200wifi: Use kmemdup

On Sat, May 15, 2010 at 10:16:58PM +0100, Julia Lawall wrote:
> From: Julia Lawall <[email protected]>
>
> 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 <[email protected]>
Acked-by: Samuel Ortiz <[email protected]>

Cheers,
Samuel.

> ---
> drivers/net/wireless/iwmc3200wifi/rx.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff -u -p a/drivers/net/wireless/iwmc3200wifi/rx.c b/drivers/net/wireless/iwmc3200wifi/rx.c
> --- a/drivers/net/wireless/iwmc3200wifi/rx.c
> +++ b/drivers/net/wireless/iwmc3200wifi/rx.c
> @@ -321,14 +321,14 @@ iwm_rx_ticket_node_alloc(struct iwm_priv
> return ERR_PTR(-ENOMEM);
> }
>
> - ticket_node->ticket = kzalloc(sizeof(struct iwm_rx_ticket), GFP_KERNEL);
> + ticket_node->ticket = kmemdup(ticket, sizeof(struct iwm_rx_ticket),
> + GFP_KERNEL);
> if (!ticket_node->ticket) {
> IWM_ERR(iwm, "Couldn't allocate RX ticket\n");
> kfree(ticket_node);
> return ERR_PTR(-ENOMEM);
> }
>
> - memcpy(ticket_node->ticket, ticket, sizeof(struct iwm_rx_ticket));
> INIT_LIST_HEAD(&ticket_node->node);
>
> return ticket_node;

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