From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
"David S. Miller" <davem@davemloft.net>
Cc: intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH net-next] igb: use struct_size() helper
Date: Thu, 7 Feb 2019 22:15:40 -0600 [thread overview]
Message-ID: <20190208041540.GA28817@embeddedor> (raw)
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 = alloc(size, GFP_KERNEL);
Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:
size = struct_size(instance, entry, count);
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/net/ethernet/intel/igb/igb_main.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 6d812e96572d..69b230c53fed 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -1189,15 +1189,15 @@ static int igb_alloc_q_vector(struct igb_adapter *adapter,
{
struct igb_q_vector *q_vector;
struct igb_ring *ring;
- int ring_count, size;
+ int ring_count;
+ size_t size;
/* igb only supports 1 Tx and/or 1 Rx queue per vector */
if (txr_count > 1 || rxr_count > 1)
return -ENOMEM;
ring_count = txr_count + rxr_count;
- size = sizeof(struct igb_q_vector) +
- (sizeof(struct igb_ring) * ring_count);
+ size = struct_size(q_vector, ring, ring_count);
/* allocate q_vector and rings */
q_vector = adapter->q_vector[v_idx];
--
2.20.1
next reply other threads:[~2019-02-08 4:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-08 4:15 Gustavo A. R. Silva [this message]
2019-02-09 7:04 ` [PATCH net-next] igb: use struct_size() helper David Miller
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