[PATCH] octeontx2-af: Fix PF driver crash with kexec kernel booting

When both AF and PF drivers are built as modules, the PF driver in the
kexec kernel may probe before the AF driver is ready. This leads to
a crash due to uninitialized hardware state.

This patch ensures the PF driver properly detects and waits for AF
driver readiness before proceeding with initialization.

Fixes: 54494aa5d1e6 ("octeontx2-af: Add Marvell OcteonTX2 RVU AF driver")
Signed-off-by: Anshumali Gaur <redacted>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
index 747fbdf2a908..8530df8b3fda 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c

@@ -3632,11 +3632,22 @@ static void rvu_remove(struct pci_dev *pdev)
 	devm_kfree(&pdev->dev, rvu);
 }
 
+static void rvu_shutdown(struct pci_dev *pdev)
+{
+	struct rvu *rvu = pci_get_drvdata(pdev);
+
+	if (!rvu)
+		return;
+
+	rvu_clear_rvum_blk_revid(rvu);
+}
+
 static struct pci_driver rvu_driver = {
 	.name = DRV_NAME,
 	.id_table = rvu_id_table,
 	.probe = rvu_probe,
 	.remove = rvu_remove,
+	.shutdown = rvu_shutdown,
 };
 
 static int __init rvu_init_module(void)

-- 
2.25.1