eth: bnxt: add missing netdev lock management to bnxt_dl_reload_up

bnxt_dl_reload_up is completely missing instance lock management
which can result in `devlink dev reload` leaving with instance
lock held. Add the missing calls.

Also add netdev_assert_locked to make it clear that the up() method
is running with the instance lock grabbed.

v2:
- add net/netdev_lock.h include to bnxt_devlink.c for netdev_assert_locked

Fixes: 004b500 ("eth: bnxt: remove most dependencies on RTNL")
Signed-off-by: Stanislav Fomichev <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Stanislav Fomichev

drivers/net/ethernet/broadcom/bnxt/bnxt_devlink.c

@@ -11,6 +11,7 @@
 #include <linux/netdevice.h>
 #include <linux/vmalloc.h>
 #include <net/devlink.h>
+#include <net/netdev_lock.h>
 #include "bnxt_hsi.h"
 #include "bnxt.h"
 #include "bnxt_hwrm.h"
@@ -518,6 +519,8 @@ static int bnxt_dl_reload_up(struct devlink *dl, enum devlink_reload_action acti
 	struct bnxt *bp = bnxt_get_bp_from_dl(dl);
 	int rc = 0;
 
+	netdev_assert_locked(bp->dev);
+
 	*actions_performed = 0;
 	switch (action) {
 	case DEVLINK_RELOAD_ACTION_DRIVER_REINIT: {
@@ -542,6 +545,7 @@ static int bnxt_dl_reload_up(struct devlink *dl, enum devlink_reload_action acti
 		if (!netif_running(bp->dev))
 			NL_SET_ERR_MSG_MOD(extack,
 					   "Device is closed, not waiting for reset notice that will never come");
+		netdev_unlock(bp->dev);
 		rtnl_unlock();
 		while (test_bit(BNXT_STATE_FW_ACTIVATE, &bp->state)) {
 			if (time_after(jiffies, timeout)) {
@@ -557,6 +561,7 @@ static int bnxt_dl_reload_up(struct devlink *dl, enum devlink_reload_action acti
 			msleep(50);
 		}
 		rtnl_lock();
+		netdev_lock(bp->dev);
 		if (!rc)
 			*actions_performed |= BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT);
 		clear_bit(BNXT_STATE_FW_ACTIVATE, &bp->state);
@@ -575,10 +580,9 @@ static int bnxt_dl_reload_up(struct devlink *dl, enum devlink_reload_action acti
 		}
 		*actions_performed |= BIT(action);
 	} else if (netif_running(bp->dev)) {
-		netdev_lock(bp->dev);
 		netif_close(bp->dev);
-		netdev_unlock(bp->dev);
 	}
+	netdev_unlock(bp->dev);
 	rtnl_unlock();
 	if (action == DEVLINK_RELOAD_ACTION_DRIVER_REINIT)
 		bnxt_ulp_start(bp, rc);