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If the MGID/MLID pair is not on the list return an error in ibcore.

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A list of MGID/MLID pairs is built when doing a multicast attach.  When
the multicast detach is called, the list is searched, and regardless of
the search outcome, the driver detach is called.

If an MGID/MLID pair is not on the list, driver detach should not be
called, and an error should be returned.  Calling the driver without
removing an MGID/MLID pair from the list can leave the core and driver
out of sync.

Linux commit:
20c7840a77ddcb2ed2fbd66e8197db2868495751

MFC after:		1 week
Sponsored by:		Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2018-07-17 08:54:40 +00:00
parent ef24f05897
commit 7a658d6545
1 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
sys/ofed/drivers/infiniband/core/ib_uverbs_cmd.c
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@ -3071,6 +3071,7 @@ ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
struct ib_qp *qp;
struct ib_uverbs_mcast_entry *mcast;
int ret = -EINVAL;
bool found = false;
if (copy_from_user(&cmd, buf, sizeof cmd))
return -EFAULT;
@ -3082,18 +3083,22 @@ ssize_t ib_uverbs_detach_mcast(struct ib_uverbs_file *file,
obj = container_of(qp->uobject, struct ib_uqp_object, uevent.uobject);
mutex_lock(&obj->mcast_lock);
ret = ib_detach_mcast(qp, (union ib_gid *) cmd.gid, cmd.mlid);
if (ret)
goto out_put;
list_for_each_entry(mcast, &obj->mcast_list, list)
if (cmd.mlid == mcast->lid &&
!memcmp(cmd.gid, mcast->gid.raw, sizeof mcast->gid.raw)) {
list_del(&mcast->list);
kfree(mcast);
found = true;
break;
}
if (!found) {
ret = -EINVAL;
goto out_put;
}
ret = ib_detach_mcast(qp, (union ib_gid *)cmd.gid, cmd.mlid);
out_put:
mutex_unlock(&obj->mcast_lock);
put_qp_write(qp);