5.4-stable review patch. If anyone has any objections, please let me know.
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From: Paul Fertser fercerpav@gmail.com
commit 6bb194d036c6e1b329dcdff459338cdd9a54802a upstream.
The NCSI state machine as it's currently implemented assumes that transition to the next logical state is performed either explicitly by calling `schedule_work(&ndp->work)` to re-queue itself or implicitly after processing the predefined (ndp->pending_req_num) number of replies. Thus to avoid the configuration FSM from advancing prematurely and getting out of sync with the process it's essential to not skip waiting for a reply.
This patch makes the code wait for reception of the Deselect Package response for the last package probed before proceeding to channel configuration.
Thanks go to Potin Lai and Cosmo Chou for the initial investigation and testing.
Fixes: 8e13f70be05e ("net/ncsi: Probe single packages to avoid conflict") Cc: stable@vger.kernel.org Signed-off-by: Paul Fertser fercerpav@gmail.com Link: https://patch.msgid.link/20250116152900.8656-1-fercerpav@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ncsi/ncsi-manage.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
--- a/net/ncsi/ncsi-manage.c +++ b/net/ncsi/ncsi-manage.c @@ -1295,6 +1295,12 @@ static void ncsi_probe_channel(struct nc nd->state = ncsi_dev_state_probe_package; break; case ncsi_dev_state_probe_package: + if (ndp->package_probe_id >= 8) { + /* Last package probed, finishing */ + ndp->flags |= NCSI_DEV_PROBED; + break; + } + ndp->pending_req_num = 1;
nca.type = NCSI_PKT_CMD_SP; @@ -1373,13 +1379,8 @@ static void ncsi_probe_channel(struct nc if (ret) goto error;
- /* Probe next package */ + /* Probe next package after receiving response */ ndp->package_probe_id++; - if (ndp->package_probe_id >= 8) { - /* Probe finished */ - ndp->flags |= NCSI_DEV_PROBED; - break; - } nd->state = ncsi_dev_state_probe_package; ndp->active_package = NULL; break;