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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2019-02-18 12:59:37 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-19 14:41:38 +0100 |
| commit | eeca7606dd6e2445f505903f235e908eb7b78dfc (patch) | |
| tree | 4f93ae3cdef55bd900999702450c884907c50b51 /drivers/usb | |
| parent | 4e46f271c37415323f2b650d02ef50c87ff8d092 (diff) | |
| download | linux-eeca7606dd6e2445f505903f235e908eb7b78dfc.tar.bz2 | |
usb: dwc2: use struct_size() in kzalloc()
One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:
struct foo {
int stuff;
struct boo entry[];
};
size = sizeof(struct foo) + count * sizeof(struct boo);
instance = kzalloc(size, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:
instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);
Notice that, in this case, variable size is not necessary, hence
it is removed.
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/dwc2/hcd.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index dd82fa516f3f..3f087962f498 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -3981,10 +3981,8 @@ static struct dwc2_hcd_urb *dwc2_hcd_urb_alloc(struct dwc2_hsotg *hsotg, gfp_t mem_flags) { struct dwc2_hcd_urb *urb; - u32 size = sizeof(*urb) + iso_desc_count * - sizeof(struct dwc2_hcd_iso_packet_desc); - urb = kzalloc(size, mem_flags); + urb = kzalloc(struct_size(urb, iso_descs, iso_desc_count), mem_flags); if (urb) urb->packet_count = iso_desc_count; return urb; |