diff options
| author |   Alex Estrin <alex.estrin@intel.com> | 2017-07-29 08:43:20 -0700 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2017-07-31 15:18:37 -0400 |
| commit | 5efd40cad4bf98f0d1f6b726d67e39decd85edc9 (patch) | |
| tree | ddcd4af0836f6a0332d719aa9adc240fca7b5cfc /drivers | |
| parent | IB/hfi1: Split copy_to_user data copy for better security (diff) | |
| download | linux-dev-5efd40cad4bf98f0d1f6b726d67e39decd85edc9.tar.xz linux-dev-5efd40cad4bf98f0d1f6b726d67e39decd85edc9.zip | |
IB/hfi1: Harden state transition to Armed and Active
There is a window that allows other threads to read state of
'host_link_state' as a new, before the hardware actual state is set.
This patch closes the window by indicating a new state only after
hardware transition is complete.
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Alex Estrin <alex.estrin@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/chip.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c index 8f7ce74a15de..eca31dd49cae 100644 --- a/drivers/infiniband/hw/hfi1/chip.c +++ b/drivers/infiniband/hw/hfi1/chip.c @@ -10602,16 +10602,15 @@ int set_link_state(struct hfi1_pportdata *ppd, u32 state) break; } - ppd->host_link_state = HLS_UP_ARMED; set_logical_state(dd, LSTATE_ARMED); ret = wait_logical_linkstate(ppd, IB_PORT_ARMED, 1000); if (ret) { - /* logical state didn't change, stay at init */ - ppd->host_link_state = HLS_UP_INIT; dd_dev_err(dd, "%s: logical state did not change to ARMED\n", __func__); + break; } + ppd->host_link_state = HLS_UP_ARMED; /* * The simulator does not currently implement SMA messages, * so neighbor_normal is not set. Set it here when we first @@ -10624,18 +10623,16 @@ int set_link_state(struct hfi1_pportdata *ppd, u32 state) if (ppd->host_link_state != HLS_UP_ARMED) goto unexpected; - ppd->host_link_state = HLS_UP_ACTIVE; set_logical_state(dd, LSTATE_ACTIVE); ret = wait_logical_linkstate(ppd, IB_PORT_ACTIVE, 1000); if (ret) { - /* logical state didn't change, stay at armed */ - ppd->host_link_state = HLS_UP_ARMED; dd_dev_err(dd, "%s: logical state did not change to ACTIVE\n", __func__); } else { /* tell all engines to go running */ sdma_all_running(dd); + ppd->host_link_state = HLS_UP_ACTIVE; /* Signal the IB layer that the port has went active */ event.device = &dd->verbs_dev.rdi.ibdev; |