From: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Date: Fri, 22 May 2020 07:39:24 +0200
Subject: RDMA/rtrs: Get rid of the do_next_path while_next_path macros
Patch-mainline: v5.8-rc1
Git-commit: a94dae867c5663f36c950b82832e146a6c2f0e42
References: jsc#SLE-15176
The macros do_each_path/while_each_path lead to a smatch warning:
drivers/infiniband/ulp/rtrs/rtrs-clt.c:1196 rtrs_clt_failover_req() warn: inconsistent indenting
drivers/infiniband/ulp/rtrs/rtrs-clt.c:2890 rtrs_clt_request() warn: inconsistent indenting
Also checkpatch complains:
ERROR: Macros with multiple statements should be enclosed in a do - while loop
The macros are used only in two places: for a normal IO path and for the
failover path triggered after errors.
Get rid of the macros and just use a for loop iterating over the list of
paths in both places. It is easier to read and also less lines of code.
Fixes: 6a98d71daea1 ("RDMA/rtrs: client: main functionality")
Link: https://lore.kernel.org/r/20200522053924.528980-1-danil.kipnis@cloud.ionos.com
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/ulp/rtrs/rtrs-clt.c | 29 +++++++++++++----------------
1 file changed, 13 insertions(+), 16 deletions(-)
--- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
@@ -726,18 +726,6 @@ struct path_it {
struct rtrs_clt_sess *(*next_path)(struct path_it *it);
};
-#define do_each_path(path, clt, it) { \
- path_it_init(it, clt); \
- rcu_read_lock(); \
- for ((it)->i = 0; ((path) = ((it)->next_path)(it)) && \
- (it)->i < (it)->clt->paths_num; \
- (it)->i++)
-
-#define while_each_path(it) \
- path_it_deinit(it); \
- rcu_read_unlock(); \
- }
-
/**
* list_next_or_null_rr_rcu - get next list element in round-robin fashion.
* @head: the head for the list.
@@ -1175,7 +1163,10 @@ static int rtrs_clt_failover_req(struct
int err = -ECONNABORTED;
struct path_it it;
- do_each_path(alive_sess, clt, &it) {
+ rcu_read_lock();
+ for (path_it_init(&it, clt);
+ (alive_sess = it.next_path(&it)) && it.i < it.clt->paths_num;
+ it.i++) {
if (unlikely(READ_ONCE(alive_sess->state) !=
RTRS_CLT_CONNECTED))
continue;
@@ -1191,7 +1182,9 @@ static int rtrs_clt_failover_req(struct
/* Success path */
rtrs_clt_inc_failover_cnt(alive_sess->stats);
break;
- } while_each_path(&it);
+ }
+ path_it_deinit(&it);
+ rcu_read_unlock();
return err;
}
@@ -2862,7 +2855,9 @@ int rtrs_clt_request(int dir, struct rtr
dma_dir = DMA_TO_DEVICE;
}
- do_each_path(sess, clt, &it) {
+ rcu_read_lock();
+ for (path_it_init(&it, clt);
+ (sess = it.next_path(&it)) && it.i < it.clt->paths_num; it.i++) {
if (unlikely(READ_ONCE(sess->state) != RTRS_CLT_CONNECTED))
continue;
@@ -2887,7 +2882,9 @@ int rtrs_clt_request(int dir, struct rtr
}
/* Success path */
break;
- } while_each_path(&it);
+ }
+ path_it_deinit(&it);
+ rcu_read_unlock();
return err;
}