[PATCH v4] net/ncsi: fix state race during channel probe completion

[PATCH v4] net/ncsi: fix state race during channel probe completion

[Potin Lai]

From: Cosmo Chou <chou.cosmo@gmail.com>

During channel probing, the last NCSI_PKT_CMD_DP command can trigger
an unnecessary schedule_work() via ncsi_free_request(). We observed
that subsequent config states were triggered before the scheduled
work completed, causing potential state handling issues.

Fix this by clearing req_flags when processing the last package.

Fixes: 8e13f70be05e ("net/ncsi: Probe single packages to avoid conflict")
Signed-off-by: Cosmo Chou <chou.cosmo@gmail.com>
---
Fix state race during channel probe completion.

Signed-off-by: Potin Lai <potin.lai.pt@gmail.com>
---
Changes in v4:
- Remove Paul's patch due to two patches are solving different issues.
- Link to v3: https://lore.kernel.org/r/20250113-fix-ncsi-mac-v3-0-564c8277eb1d@gmail.com

Changes in v3:
- Fix compile error by removing non-exist variable.
- Link to v2: https://lore.kernel.org/r/20250111-fix-ncsi-mac-v2-0-838e0a1a233a@gmail.com

Changes in v2:
- Add second patch for fixing state handling issue.
- Link to v1: https://lore.kernel.org/all/20250109145054.30925-1-fercerpav@gmail.com/
---
 net/ncsi/ncsi-manage.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/ncsi/ncsi-manage.c b/net/ncsi/ncsi-manage.c
index 5cf55bde366d..2feff885eeff 100644
--- a/net/ncsi/ncsi-manage.c
+++ b/net/ncsi/ncsi-manage.c
@@ -1479,7 +1479,10 @@ static void ncsi_probe_channel(struct ncsi_dev_priv *ndp)
 		}
 		break;
 	case ncsi_dev_state_probe_dp:
-		ndp->pending_req_num = 1;
+		if (ndp->package_probe_id + 1 < 8)
+			ndp->pending_req_num = 1;
+		else
+			nca.req_flags = 0;
 
 		/* Deselect the current package */
 		nca.type = NCSI_PKT_CMD_DP;

---
base-commit: 56e6a3499e14716b9a28a307bb6d18c10e95301e
change-id: 20250111-fix-ncsi-mac-1e4b3df431f1

Best regards,
-- 
Potin Lai <potin.lai.pt@gmail.com>