Commit 4838ae72 authored by Litao Jiao's avatar Litao Jiao
Browse files

net/smc: Add size match for smc_buf_get_slot 

sangfor inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I76JHC



--------------------------------

This add the ability to get a unused smc_buf_desc based on the buf size
which ensures that the size of obtained smc_buf_desc is the same as the
size set.

Signed-off-by: default avatarLitao Jiao <jiaolitao@sangfor.com.cn>
parent 0a6720ed

net/smc/smc_core.c

+3 −3
Original line number Diff line number Diff line
@@ -1432,7 +1432,7 @@ int smc_uncompress_bufsize(u8 compressed) 
/* try to reuse a sndbuf or rmb description slot for a certain

 * buffer size; if not available, return NULL

 */

static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,

static struct smc_buf_desc *smc_buf_get_slot(int bufsize,

					     struct rw_semaphore *lock,

					     struct list_head *buf_list)

{
@@ -1440,7 +1440,7 @@ static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, 


	down_read(lock);

	list_for_each_entry(buf_slot, buf_list, list) {

		if (cmpxchg(&buf_slot->used, 0, 1) == 0) {

		if (buf_slot->len == bufsize && (cmpxchg(&buf_slot->used, 0, 1) == 0)) {

			up_read(lock);

			return buf_slot;

		}
@@ -1773,7 +1773,7 @@ static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 
		bufsize = smc_uncompress_bufsize(bufsize_short);



		/* check for reusable slot in the link group */

		buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);

		buf_desc = smc_buf_get_slot(bufsize, lock, buf_list);

		if (buf_desc) {

			break; /* found reusable slot */

		}