sfc: don't double-down() filters in ef100_reset()

dev_close(), by way of ef100_net_stop(), already brings down the filter
 table, so there's no need to do it again (which just causes lots of
 WARN_ONs).
Similarly, don't bring it up ourselves, as dev_open() -> ef100_net_open()
 will do it, and will fail if it's already been brought up.

Fixes: a9dc3d56 ("sfc_ef100: RX filter table management and related gubbins")
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/sfc/ef100_nic.c

@@ -428,24 +428,12 @@ static int ef100_reset(struct efx_nic *efx, enum reset_type reset_type)
 		__clear_bit(reset_type, &efx->reset_pending);
 		rc = dev_open(efx->net_dev, NULL);
 	} else if (reset_type == RESET_TYPE_ALL) {
-		/* A RESET_TYPE_ALL will cause filters to be removed, so we remove filters
-		 * and reprobe after reset to avoid removing filters twice
-		 */
-		down_write(&efx->filter_sem);
-		ef100_filter_table_down(efx);
-		up_write(&efx->filter_sem);
 		rc = efx_mcdi_reset(efx, reset_type);
 		if (rc)
 			return rc;
 
 		netif_device_attach(efx->net_dev);
 
-		down_write(&efx->filter_sem);
-		rc = ef100_filter_table_up(efx);
-		up_write(&efx->filter_sem);
-		if (rc)
-			return rc;
-
 		rc = dev_open(efx->net_dev, NULL);
 	} else {
 		rc = 1;	/* Leave the device closed */