From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Igor Mitsyanko <imitsyanko@quantenna.com>,
Avinash Patil <avinashp@quantenna.com>,
Sergey Matyukevich <smatyukevich@quantenna.com>,
Kalle Valo <kvalo@codeaurora.org>,
"David S. Miller" <davem@davemloft.net>
Cc: linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH][next] qtnfmac: replace qtnf_cmd_acl_data_size() with struct_size()
Date: Wed, 3 Apr 2019 12:02:36 -0500 [thread overview]
Message-ID: <20190403170236.GA31637@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 = kzalloc(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);
or
instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL)
Based on the above, replace qtnf_cmd_acl_data_size() with the
new struct_size() helper.
This code was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/net/wireless/quantenna/qtnfmac/commands.c | 15 ++++-----------
1 file changed, 4 insertions(+), 11 deletions(-)
diff --git a/drivers/net/wireless/quantenna/qtnfmac/commands.c b/drivers/net/wireless/quantenna/qtnfmac/commands.c
index 85a2a58f4c16..534d5a4d06fb 100644
--- a/drivers/net/wireless/quantenna/qtnfmac/commands.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/commands.c
@@ -177,14 +177,6 @@ static void qtnf_cmd_tlv_ie_set_add(struct sk_buff *cmd_skb, u8 frame_type,
memcpy(tlv->ie_data, buf, len);
}
-static inline size_t qtnf_cmd_acl_data_size(const struct cfg80211_acl_data *acl)
-{
- size_t size = sizeof(struct qlink_acl_data) +
- acl->n_acl_entries * sizeof(struct qlink_mac_address);
-
- return size;
-}
-
static bool qtnf_cmd_start_ap_can_fit(const struct qtnf_vif *vif,
const struct cfg80211_ap_settings *s)
{
@@ -203,7 +195,7 @@ static bool qtnf_cmd_start_ap_can_fit(const struct qtnf_vif *vif,
if (s->acl)
len += sizeof(struct qlink_tlv_hdr) +
- qtnf_cmd_acl_data_size(s->acl);
+ struct_size(s->acl, mac_addrs, s->acl->n_acl_entries);
if (len > (sizeof(struct qlink_cmd) + QTNF_MAX_CMD_BUF_SIZE)) {
pr_err("VIF%u.%u: can not fit AP settings: %u\n",
@@ -310,7 +302,8 @@ int qtnf_cmd_send_start_ap(struct qtnf_vif *vif,
}
if (s->acl) {
- size_t acl_size = qtnf_cmd_acl_data_size(s->acl);
+ size_t acl_size = struct_size(s->acl, mac_addrs,
+ s->acl->n_acl_entries);
struct qlink_tlv_hdr *tlv =
skb_put(cmd_skb, sizeof(*tlv) + acl_size);
@@ -2592,7 +2585,7 @@ int qtnf_cmd_set_mac_acl(const struct qtnf_vif *vif,
struct qtnf_bus *bus = vif->mac->bus;
struct sk_buff *cmd_skb;
struct qlink_tlv_hdr *tlv;
- size_t acl_size = qtnf_cmd_acl_data_size(params);
+ size_t acl_size = struct_size(params, mac_addrs, params->n_acl_entries);
int ret;
cmd_skb = qtnf_cmd_alloc_new_cmdskb(vif->mac->macid, vif->vifid,
--
2.21.0
next reply other threads:[~2019-04-03 17:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-03 17:02 Gustavo A. R. Silva [this message]
2019-04-04 13:32 ` [PATCH][next] qtnfmac: replace qtnf_cmd_acl_data_size() with struct_size() Sergey Matyukevich
2019-04-04 16:01 ` Gustavo A. R. Silva
2019-04-04 16:33 ` Gustavo A. R. Silva
2019-04-04 16:40 ` Kalle Valo
2019-04-04 16:45 ` Gustavo A. R. Silva
2019-04-04 16:38 ` Kalle Valo
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