cxgb4: fix sleep in atomic when flashing PHY firmware

[ Upstream commit f046bd0 ]

Before writing new PHY firmware to on-chip memory, driver queries
firmware for current running PHY firmware version, which can result
in sleep waiting for reply. So, move spinlock closer to the actual
on-chip memory write operation, instead of taking it at the callers.

Fixes: 5fff701 ("cxgb4: always sync access when flashing PHY firmware")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/ethernet/chelsio/cxgb4/cxgb4_ethtool.c

@@ -1337,9 +1337,7 @@ static int cxgb4_ethtool_flash_phy(struct net_device *netdev,
 		return ret;
 	}
 
-	spin_lock_bh(&adap->win0_lock);
 	ret = t4_load_phy_fw(adap, MEMWIN_NIC, NULL, data, size);
-	spin_unlock_bh(&adap->win0_lock);
 	if (ret)
 		dev_err(adap->pdev_dev, "Failed to load PHY FW\n");
 

drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c

@@ -4428,10 +4428,8 @@ static int adap_init0_phy(struct adapter *adap)
 
 	/* Load PHY Firmware onto adapter.
 	 */
-	spin_lock_bh(&adap->win0_lock);
 	ret = t4_load_phy_fw(adap, MEMWIN_NIC, phy_info->phy_fw_version,
 			     (u8 *)phyf->data, phyf->size);
-	spin_unlock_bh(&adap->win0_lock);
 	if (ret < 0)
 		dev_err(adap->pdev_dev, "PHY Firmware transfer error %d\n",
 			-ret);

drivers/net/ethernet/chelsio/cxgb4/t4_hw.c

@@ -3827,9 +3827,11 @@ int t4_load_phy_fw(struct adapter *adap, int win,
 	/* Copy the supplied PHY Firmware image to the adapter memory location
 	 * allocated by the adapter firmware.
 	 */
+	spin_lock_bh(&adap->win0_lock);
 	ret = t4_memory_rw(adap, win, mtype, maddr,
 			   phy_fw_size, (__be32 *)phy_fw_data,
 			   T4_MEMORY_WRITE);
+	spin_unlock_bh(&adap->win0_lock);
 	if (ret)
 		return ret;