[PATCH v2 1/1] staging: ozwpan: Remove allocation from delaration line

[PATCH v2 1/1] staging: ozwpan: Remove allocation from delaration line

[Quentin Lambert]

This patch removes allocation from declaration line because
people are known to gloss over declarations.

Signed-off-by: Quentin Lambert <lambert.quentin@gmail.com>
---
 Changes since v1:
 - Remove the blank line between allocation and NULL check

 drivers/staging/ozwpan/ozhcd.c | 5 +++--
 drivers/staging/ozwpan/ozpd.c  | 8 +++++---
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c
index 8543bb2..96e95bf 100644
--- a/drivers/staging/ozwpan/ozhcd.c
+++ b/drivers/staging/ozwpan/ozhcd.c
@@ -280,8 +280,9 @@ static void oz_free_urb_link(struct oz_urb_link *urbl)
  */
 static struct oz_endpoint *oz_ep_alloc(int buffer_size, gfp_t mem_flags)
 {
-	struct oz_endpoint *ep =
-		kzalloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
+	struct oz_endpoint *ep;
+
+	ep = kzalloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
 	if (ep) {
 		INIT_LIST_HEAD(&ep->urb_list);
 		INIT_LIST_HEAD(&ep->link);
diff --git a/drivers/staging/ozwpan/ozpd.c b/drivers/staging/ozwpan/ozpd.c
index 852c288..1c95d57 100644
--- a/drivers/staging/ozwpan/ozpd.c
+++ b/drivers/staging/ozwpan/ozpd.c
@@ -102,8 +102,9 @@ void oz_pd_put(struct oz_pd *pd)
  */
 struct oz_pd *oz_pd_alloc(const u8 *mac_addr)
 {
-	struct oz_pd *pd = kzalloc(sizeof(struct oz_pd), GFP_ATOMIC);
+	struct oz_pd *pd;
 
+	pd = kzalloc(sizeof(struct oz_pd), GFP_ATOMIC);
 	if (pd) {
 		int i;
 
@@ -652,8 +653,9 @@ static struct oz_isoc_stream *pd_stream_find(struct oz_pd *pd, u8 ep_num)
  */
 int oz_isoc_stream_create(struct oz_pd *pd, u8 ep_num)
 {
-	struct oz_isoc_stream *st =
-		kzalloc(sizeof(struct oz_isoc_stream), GFP_ATOMIC);
+	struct oz_isoc_stream *st;
+
+	st = kzalloc(sizeof(struct oz_isoc_stream), GFP_ATOMIC);
 	if (!st)
 		return -ENOMEM;
 	st->ep_num = ep_num;
-- 
1.9.1

Re: [PATCH v2 1/1] staging: ozwpan: Remove allocation from delaration line

[Dan Carpenter]

Looks good.  Thanks!

> diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c
> index 8543bb2..96e95bf 100644
> --- a/drivers/staging/ozwpan/ozhcd.c
> +++ b/drivers/staging/ozwpan/ozhcd.c
> @@ -280,8 +280,9 @@ static void oz_free_urb_link(struct oz_urb_link *urbl)
>   */
>  static struct oz_endpoint *oz_ep_alloc(int buffer_size, gfp_t mem_flags)
>  {
> -	struct oz_endpoint *ep =
> -		kzalloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
> +	struct oz_endpoint *ep;
> +
> +	ep = kzalloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
>  	if (ep) {

Also notice how in the original code, we had to mangle the code to make
it fit into 80 characters so the new code looks much better.

regards,
dan
carpenter

Re: [PATCH v2 1/1] staging: ozwpan: Remove allocation from delaration line

[Joe Perches]

On Tue, 2015-02-10 at 13:13 +0300, Dan Carpenter wrote:
> > diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c
[]
> > @@ -280,8 +280,9 @@ static void oz_free_urb_link(struct oz_urb_link *urbl)
> >   */
> >  static struct oz_endpoint *oz_ep_alloc(int buffer_size, gfp_t mem_flags)
> >  {
> > -	struct oz_endpoint *ep =
> > -		kzalloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
> > +	struct oz_endpoint *ep;
> > +
> > +	ep = kzalloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
> >  	if (ep) {
> 
> Also notice how in the original code, we had to mangle the code to make
> it fit into 80 characters so the new code looks much better.

or maybe
	ep = kzalloc(sizeof(*ep) + buffer_size, mem_flags);

The current function also tests the return of ep slightly backwards.

static struct oz_endpoint *oz_ep_alloc(int buffer_size, gfp_t mem_flags)
{
	struct oz_endpoint *ep =
		kzalloc(sizeof(struct oz_endpoint)+buffer_size, mem_flags);
	if (ep) {
		INIT_LIST_HEAD(&ep->urb_list);
		INIT_LIST_HEAD(&ep->link);
		ep->credit = -1;
		if (buffer_size) {
			ep->buffer_size = buffer_size;
			ep->buffer = (u8 *)(ep+1);
		}
	}
	return ep;
}

Perhaps more typical would be:

static struct oz_endpoint *oz_ep_alloc(int buffer_size, gfp_t mem_flags)
{
	struct oz_endpoint *ep;

	ep = kzalloc(sizeof(*ep) + buffer_size, mem_flags);
	if (!ep)
		return NULL;

	INIT_LIST_HEAD(&ep->urb_list);
	INIT_LIST_HEAD(&ep->link);
	ep->credit = -1;
	if (buffer_size) {
		ep->buffer_size = buffer_size;
		ep->buffer = (u8 *)(ep + 1);
	}

	return ep;
}

Maybe buffer_size should be size_t too to avoid
possible negative values.