Re: [PATCH] usb: core: driver: Use kmalloc_array

[Joe Perches <joe@perches.com>]

On Mon, 2015-08-24 at 00:18 +0530, Muhammad Falak R Wani wrote:
> This patch introduces the use of function kmalloc_array(), instead
> of using kmalloc(), for allocating memory for an array and removes
> the corresponding call to kmalloc().
[]
> diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
[]
> @@ -416,7 +416,7 @@ static int usb_unbind_interface(struct device *dev)
>  		if (ep->streams == 0)
>  			continue;
>  		if (j == 0) {
> -			eps = kmalloc(USB_MAXENDPOINTS * sizeof(void *),
> +			eps = kmalloc_array(USB_MAXENDPOINTS, sizeof(void *),
>  				      GFP_KERNEL);
>  			if (!eps) {
>  				dev_warn(dev, "oom, leaking streams\n");

Allocations like this really don't need to use
kmalloc_array as it's unlikely that USB_MAXENDPOINTS
is very large.

If you are going to do this, it'd be nicer to keep
the parenthesis alignment and likely also better to
remove the dev_warn for a memory leak.