[net PATCH v2 1/7] octeontx2-af: Secure APR table update with the lock

[Sai Krishna <saikrishnag@marvell.com>]

From: Geetha sowjanya <gakula@marvell.com>

APR table contains the lmtst base address of PF/VFs.
These entries are updated by the PF/VF during the
device probe. Due to race condition while updating the
entries are getting corrupted. Hence secure the APR
table update with the lock.

Fixes: 893ae97214c3 ("octeontx2-af: cn10k: Support configurable LMTST regions")
Signed-off-by: Geetha sowjanya <gakula@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Sai Krishna <saikrishnag@marvell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c
index 4ad9ff025c96..8530250f6fba 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_cn10k.c
@@ -142,16 +142,17 @@ int rvu_mbox_handler_lmtst_tbl_setup(struct rvu *rvu,
 	 * region, if so, convert that IOVA to physical address and
 	 * populate LMT table with that address
 	 */
+	mutex_lock(&rvu->rsrc_lock);
 	if (req->use_local_lmt_region) {
 		err = rvu_get_lmtaddr(rvu, req->hdr.pcifunc,
 				      req->lmt_iova, &lmt_addr);
 		if (err < 0)
-			return err;
+			goto error;
 
 		/* Update the lmt addr for this PFFUNC in the LMT table */
 		err = rvu_update_lmtaddr(rvu, req->hdr.pcifunc, lmt_addr);
 		if (err)
-			return err;
+			goto error;
 	}
 
 	/* Reconfiguring lmtst map table in lmt region shared mode i.e. make
@@ -181,7 +182,7 @@ int rvu_mbox_handler_lmtst_tbl_setup(struct rvu *rvu,
 		 */
 		err = rvu_update_lmtaddr(rvu, req->hdr.pcifunc, val);
 		if (err)
-			return err;
+			goto error;
 	}
 
 	/* This mailbox can also be used to update word1 of APR_LMT_MAP_ENTRY_S
@@ -230,6 +231,7 @@ int rvu_mbox_handler_lmtst_tbl_setup(struct rvu *rvu,
 	}
 
 error:
+	mutex_unlock(&rvu->rsrc_lock);
 	return err;
 }
 
-- 
2.25.1