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net/smc: fix smc_buf_unuse to use the lgr pointer 

The pointer to the link group is unset in the smc connection structure
right before the call to smc_buf_unuse. Provide the lgr pointer to
smc_buf_unuse explicitly.
And move the call to smc_lgr_schedule_free_work to the end of
smc_conn_free.

Fixes: a6920d1d13 ("net/smc: handle unregistered buffers")
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2018-10-25 13:25:28 +02:00 committed by David S. Miller
parent ee1abcf689
commit fb692ec411
1 changed files with 12 additions and 13 deletions
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25
net/smc/smc_core.c
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@ -122,22 +122,17 @@ static void __smc_lgr_unregister_conn(struct smc_connection *conn)
sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
}
/* Unregister connection and trigger lgr freeing if applicable
/* Unregister connection from lgr
*/
static void smc_lgr_unregister_conn(struct smc_connection *conn)
{
struct smc_link_group *lgr = conn->lgr;
int reduced = 0;
write_lock_bh(&lgr->conns_lock);
if (conn->alert_token_local) {
reduced = 1;
__smc_lgr_unregister_conn(conn);
}
write_unlock_bh(&lgr->conns_lock);
if (!reduced || lgr->conns_num)
return;
smc_lgr_schedule_free_work(lgr);
}
/* Send delete link, either as client to request the initiation
@ -291,7 +286,8 @@ out:
return rc;
}
static void smc_buf_unuse(struct smc_connection *conn)
static void smc_buf_unuse(struct smc_connection *conn,
struct smc_link_group *lgr)
{
if (conn->sndbuf_desc)
conn->sndbuf_desc->used = 0;
@ -301,8 +297,6 @@ static void smc_buf_unuse(struct smc_connection *conn)
conn->rmb_desc->used = 0;
} else {
/* buf registration failed, reuse not possible */
struct smc_link_group *lgr = conn->lgr;
write_lock_bh(&lgr->rmbs_lock);
list_del(&conn->rmb_desc->list);
write_unlock_bh(&lgr->rmbs_lock);
@ -315,16 +309,21 @@ static void smc_buf_unuse(struct smc_connection *conn)
/* remove a finished connection from its link group */
void smc_conn_free(struct smc_connection *conn)
{
if (!conn->lgr)
struct smc_link_group *lgr = conn->lgr;
if (!lgr)
return;
if (conn->lgr->is_smcd) {
if (lgr->is_smcd) {
smc_ism_unset_conn(conn);
tasklet_kill(&conn->rx_tsklet);
} else {
smc_cdc_tx_dismiss_slots(conn);
}
smc_lgr_unregister_conn(conn);
smc_buf_unuse(conn);
smc_lgr_unregister_conn(conn); /* unsets conn->lgr */
smc_buf_unuse(conn, lgr); /* allow buffer reuse */
if (!lgr->conns_num)
smc_lgr_schedule_free_work(lgr);
}
static void smc_link_clear(struct smc_link *lnk)