On 04/05/15 14:06, Julia Lawall wrote:
Return a negative error code on failure. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier ret; expression e1,e2; @@ ( if (\(ret < 0\|ret != 0\)) { ... return ret; } | ret = 0 ) ... when != ret = e1 when != &ret *if(...) { ... when != ret = e2 when forall return ret; } // </smpl> In the first case, the printk is changed to use the ret value, rather than duplicating PTR_ERR(ch->thread). This requires changing the format from %ld to %d, to account for the type of ret. Signed-off-by: Julia Lawall <Julia.Lawall@xxxxxxx> --- drivers/infiniband/ulp/srpt/ib_srpt.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c index 6e0a477..5ec98f5 100644 --- a/drivers/infiniband/ulp/srpt/ib_srpt.c +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c @@ -2143,8 +2143,8 @@ retry: ch->thread = kthread_run(srpt_compl_thread, ch, "ib_srpt_compl"); if (IS_ERR(ch->thread)) { - printk(KERN_ERR "failed to create kernel thread %ld\n", - PTR_ERR(ch->thread)); + ret = PTR_ERR(ch->thread); + printk(KERN_ERR "failed to create kernel thread %d\n", ret); ch->thread = NULL; goto err_destroy_qp; } @@ -2590,6 +2590,7 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id, " configured yet for initiator %s.\n", ch->sess_name); rej->reason = __constant_cpu_to_be32( SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED); + ret = -EINVAL; goto destroy_ib; } @@ -2598,6 +2599,7 @@ static int srpt_cm_req_recv(struct ib_cm_id *cm_id, rej->reason = __constant_cpu_to_be32( SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES); pr_debug("Failed to create session\n"); + ret = PTR_ERR(ch->sess); goto deregister_session; } ch->sess->se_node_acl = &nacl->nacl;
This is not the proper way to fix srpt_cm_req_recv(). The kthread_run() call must be moved from srpt_create_ch_ib() to after the session registration code in srpt_cm_req_recv(), and the session registration call + the kthread_run() call must be protected via a mutex against concurrent HCA hot-plug removal events (see also srpt_remove_one() and srpt_remove_sdev()).
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