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authorJames Smart <jsmart2021@gmail.com>2017-11-30 03:47:30 +0300
committerChristoph Hellwig <hch@lst.de>2018-01-08 13:01:53 +0300
commit278e096063f1914fccfc77a617be9fc8dbb31b0e (patch)
tree8bbb60c518b3ea73bc14e8848acff1e3acd969a9 /drivers/nvme
parent6a1c57acab85e2e7a18827b43710b4e16c11148d (diff)
downloadlinux-278e096063f1914fccfc77a617be9fc8dbb31b0e.tar.xz
nvme_fcloop: fix abort race condition
A test case revealed a race condition of an i/o completing on a thread parallel to the delete_association generating the aborts for the outstanding ios on the controller. The i/o completion was freeing the target fcloop context, thus the abort task referenced the just-freed memory. Correct by clearing the target/initiator cross pointers in the io completion and abort tasks before calling the callbacks. On aborts that detect already finished io's, ensure the complete context is called. Signed-off-by: James Smart <james.smart@broadcom.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/target/fcloop.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
index 7b75d9de55ab..3eb2a0733f46 100644
--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -370,6 +370,7 @@ fcloop_tgt_fcprqst_done_work(struct work_struct *work)
spin_lock(&tfcp_req->reqlock);
fcpreq = tfcp_req->fcpreq;
+ tfcp_req->fcpreq = NULL;
spin_unlock(&tfcp_req->reqlock);
if (tport->remoteport && fcpreq) {
@@ -611,11 +612,7 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
if (!tfcp_req)
/* abort has already been called */
- return;
-
- if (rport->targetport)
- nvmet_fc_rcv_fcp_abort(rport->targetport,
- &tfcp_req->tgt_fcp_req);
+ goto finish;
/* break initiator/target relationship for io */
spin_lock(&tfcp_req->reqlock);
@@ -623,6 +620,11 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
tfcp_req->fcpreq = NULL;
spin_unlock(&tfcp_req->reqlock);
+ if (rport->targetport)
+ nvmet_fc_rcv_fcp_abort(rport->targetport,
+ &tfcp_req->tgt_fcp_req);
+
+finish:
/* post the aborted io completion */
fcpreq->status = -ECANCELED;
schedule_work(&inireq->iniwork);