[PATCH 6/6] nvme-auth: use a define for chap buffer size

[Hannes Reinecke <hare@suse.de>]

The chap buffer size is pretty much static, so we can make it
a define and save the variable.

Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/nvme/host/auth.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/nvme/host/auth.c b/drivers/nvme/host/auth.c
index 6ca0c2bb06c0..444f56399ffc 100644
--- a/drivers/nvme/host/auth.c
+++ b/drivers/nvme/host/auth.c
@@ -13,6 +13,8 @@
 #include "fabrics.h"
 #include <linux/nvme-auth.h>
 
+#define CHAP_BUF_SIZE 4096
+
 struct nvme_dhchap_queue_context {
 	struct list_head entry;
 	struct work_struct auth_work;
@@ -20,7 +22,6 @@ struct nvme_dhchap_queue_context {
 	struct crypto_shash *shash_tfm;
 	struct crypto_kpp *dh_tfm;
 	void *buf;
-	size_t buf_size;
 	int qid;
 	int error;
 	u32 s1;
@@ -114,7 +115,7 @@ static int nvme_auth_set_dhchap_negotiate_data(struct nvme_ctrl *ctrl,
 	struct nvmf_auth_dhchap_negotiate_data *data = chap->buf;
 	size_t size = sizeof(*data) + sizeof(union nvmf_auth_protocol);
 
-	if (chap->buf_size < size) {
+	if (CHAP_BUF_SIZE < size) {
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD;
 		return -EINVAL;
 	}
@@ -149,7 +150,7 @@ static int nvme_auth_process_dhchap_challenge(struct nvme_ctrl *ctrl,
 	const char *gid_name = nvme_auth_dhgroup_name(data->dhgid);
 	const char *hmac_name, *kpp_name;
 
-	if (chap->buf_size < size) {
+	if (CHAP_BUF_SIZE < size) {
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD;
 		return NVME_SC_DNR | NVME_SC_INVALID_FIELD;
 	}
@@ -306,7 +307,7 @@ static int nvme_auth_set_dhchap_reply_data(struct nvme_ctrl *ctrl,
 	if (chap->host_key_len)
 		size += chap->host_key_len;
 
-	if (chap->buf_size < size) {
+	if (CHAP_BUF_SIZE < size) {
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD;
 		return -EINVAL;
 	}
@@ -351,7 +352,7 @@ static int nvme_auth_process_dhchap_success1(struct nvme_ctrl *ctrl,
 	if (ctrl->ctrl_key)
 		size += chap->hash_len;
 
-	if (chap->buf_size < size) {
+	if (CHAP_BUF_SIZE < size) {
 		chap->status = NVME_AUTH_DHCHAP_FAILURE_INCORRECT_PAYLOAD;
 		return NVME_SC_DNR | NVME_SC_INVALID_FIELD;
 	}
@@ -711,11 +712,9 @@ static void __nvme_auth_work(struct work_struct *work)
 	chap->error = 0;
 
 	/*
-	 * Allocate a large enough buffer for the entire negotiation:
-	 * 4k should be enough to ffdhe8192.
+	 * Allocate a buffer large enough for the entire negotiation
 	 */
-	chap->buf_size = 4096;
-	chap->buf = kzalloc(chap->buf_size, GFP_KERNEL);
+	chap->buf = kzalloc(CHAP_BUF_SIZE, GFP_KERNEL);
 	if (!chap->buf) {
 		chap->error = -ENOMEM;
 		return;
@@ -740,8 +739,8 @@ static void __nvme_auth_work(struct work_struct *work)
 	dev_dbg(ctrl->device, "%s: qid %d receive challenge\n",
 		__func__, chap->qid);
 
-	memset(chap->buf, 0, chap->buf_size);
-	ret = nvme_auth_submit(ctrl, chap->qid, chap->buf, chap->buf_size, false);
+	memset(chap->buf, 0, CHAP_BUF_SIZE);
+	ret = nvme_auth_submit(ctrl, chap->qid, chap->buf, CHAP_BUF_SIZE, false);
 	if (ret) {
 		dev_warn(ctrl->device,
 			 "qid %d failed to receive challenge, %s %d\n",
@@ -803,8 +802,8 @@ static void __nvme_auth_work(struct work_struct *work)
 	dev_dbg(ctrl->device, "%s: qid %d receive success1\n",
 		__func__, chap->qid);
 
-	memset(chap->buf, 0, chap->buf_size);
-	ret = nvme_auth_submit(ctrl, chap->qid, chap->buf, chap->buf_size, false);
+	memset(chap->buf, 0, CHAP_BUF_SIZE);
+	ret = nvme_auth_submit(ctrl, chap->qid, chap->buf, CHAP_BUF_SIZE, false);
 	if (ret) {
 		dev_warn(ctrl->device,
 			 "qid %d failed to receive success1, %s %d\n",
-- 
2.35.3