bnxt_en: extend RTNL to VF check in devlink driver_reinit

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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c
index 5c464ea..a0a9af4 100644 (file)
--- 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;