[PATCH net 1/3] bnxt_en: extend RTNL to VF check in devlink driver_reinit

[Michael Chan <michael.chan@broadcom.com>]

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From: Edwin Peer <edwin.peer@broadcom.com>

The fixes the race condition between configuring SR-IOV and devlink
reload.  The SR-IOV configure logic already takes the RTNL lock,
setting sriov_cfg under the lock while changes are underway. Extend
the lock scope in devlink driver_reinit to cover the VF check and
don't run concurrently with SR-IOV configure.

Reported-by: Leon Romanovsky <leon@kernel.org>
Fixes: 228ea8c187d8 ("bnxt_en: implement devlink dev reload driver_reinit")
Cc: Leon Romanovsky <leon@kernel.org>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
index 5c464ea73576..a0a9af402642 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
@@ -441,12 +441,13 @@ static int bnxt_dl_reload_down(struct devlink *dl, bool netns_change,
 
 	switch (action) {
 	case DEVLINK_RELOAD_ACTION_DRIVER_REINIT: {
-		if (BNXT_PF(bp) && bp->pf.active_vfs) {
+		rtnl_lock();
+		if (BNXT_PF(bp) && (bp->pf.active_vfs || bp->sriov_cfg)) {
 			NL_SET_ERR_MSG_MOD(extack,
-					   "reload is unsupported when VFs are allocated");
+					   "reload is unsupported while VFs are allocated or being configured");
+			rtnl_unlock();
 			return -EOPNOTSUPP;
 		}
-		rtnl_lock();
 		if (bp->dev->reg_state == NETREG_UNREGISTERED) {
 			rtnl_unlock();
 			return -ENODEV;
-- 
2.18.1


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