bnxt_en: Fix wrong return value check in bnxt_close_nic()

The wait_event_interruptible_timeout() function returns 0
if the timeout elapsed, -ERESTARTSYS if it was interrupted
by a signal, and the remaining jiffies otherwise if the
condition evaluated to true before the timeout elapsed.

Driver should have checked for zero return value instead of
a positive value.

MChan: Print a warning for -ERESTARTSYS.  The close operation
will proceed anyway when wait_event_interruptible_timeout()
returns for any reason.  Since we do the close no matter what,
we should not return this error code to the caller.  Change
bnxt_close_nic() to a void function and remove all error
handling from some of the callers.

Fixes: c0c050c ("bnxt_en: New Broadcom ethernet driver.")
Reviewed-by: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Reviewed-by: Vikas Gupta <vikas.gupta@broadcom.com>
Reviewed-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20231208001658.14230-4-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kaleshap86

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

@@ -10732,10 +10732,8 @@ static void __bnxt_close_nic(struct bnxt *bp, bool irq_re_init,
 	bnxt_free_mem(bp, irq_re_init);
 }
 
-int bnxt_close_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init)
+void bnxt_close_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init)
 {
-	int rc = 0;
-
 	if (test_bit(BNXT_STATE_IN_FW_RESET, &bp->state)) {
 		/* If we get here, it means firmware reset is in progress
 		 * while we are trying to close.  We can safely proceed with
@@ -10750,15 +10748,18 @@ int bnxt_close_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init)
 
 #ifdef CONFIG_BNXT_SRIOV
 	if (bp->sriov_cfg) {
+		int rc;
+
 		rc = wait_event_interruptible_timeout(bp->sriov_cfg_wait,
 						      !bp->sriov_cfg,
 						      BNXT_SRIOV_CFG_WAIT_TMO);
-		if (rc)
-			netdev_warn(bp->dev, "timeout waiting for SRIOV config operation to complete!\n");
+		if (!rc)
+			netdev_warn(bp->dev, "timeout waiting for SRIOV config operation to complete, proceeding to close!\n");
+		else if (rc < 0)
+			netdev_warn(bp->dev, "SRIOV config operation interrupted, proceeding to close!\n");
 	}
 #endif
 	__bnxt_close_nic(bp, irq_re_init, link_re_init);
-	return rc;
 }
 
 static int bnxt_close(struct net_device *dev)

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -2375,7 +2375,7 @@ int bnxt_open_nic(struct bnxt *, bool, bool);
 int bnxt_half_open_nic(struct bnxt *bp);
 void bnxt_half_close_nic(struct bnxt *bp);
 void bnxt_reenable_sriov(struct bnxt *bp);
-int bnxt_close_nic(struct bnxt *, bool, bool);
+void bnxt_close_nic(struct bnxt *, bool, bool);
 void bnxt_get_ring_err_stats(struct bnxt *bp,
 			     struct bnxt_total_ring_err_stats *stats);
 int bnxt_dbg_hwrm_rd_reg(struct bnxt *bp, u32 reg_off, u16 num_words,

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

@@ -449,15 +449,8 @@ static int bnxt_dl_reload_down(struct devlink *dl, bool netns_change,
 			return -ENODEV;
 		}
 		bnxt_ulp_stop(bp);
-		if (netif_running(bp->dev)) {
-			rc = bnxt_close_nic(bp, true, true);
-			if (rc) {
-				NL_SET_ERR_MSG_MOD(extack, "Failed to close");
-				dev_close(bp->dev);
-				rtnl_unlock();
-				break;
-			}
-		}
+		if (netif_running(bp->dev))
+			bnxt_close_nic(bp, true, true);
 		bnxt_vf_reps_free(bp);
 		rc = bnxt_hwrm_func_drv_unrgtr(bp);
 		if (rc) {

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

@@ -165,9 +165,8 @@ static int bnxt_set_coalesce(struct net_device *dev,
 reset_coalesce:
 	if (test_bit(BNXT_STATE_OPEN, &bp->state)) {
 		if (update_stats) {
-			rc = bnxt_close_nic(bp, true, false);
-			if (!rc)
-				rc = bnxt_open_nic(bp, true, false);
+			bnxt_close_nic(bp, true, false);
+			rc = bnxt_open_nic(bp, true, false);
 		} else {
 			rc = bnxt_hwrm_set_coal(bp);
 		}
@@ -972,12 +971,7 @@ static int bnxt_set_channels(struct net_device *dev,
 			 * before PF unload
 			 */
 		}
-		rc = bnxt_close_nic(bp, true, false);
-		if (rc) {
-			netdev_err(bp->dev, "Set channel failure rc :%x\n",
-				   rc);
-			return rc;
-		}
+		bnxt_close_nic(bp, true, false);
 	}
 
 	if (sh) {
@@ -4042,12 +4036,7 @@ static void bnxt_self_test(struct net_device *dev, struct ethtool_test *etest,
 		bnxt_run_fw_tests(bp, test_mask, &test_results);
 	} else {
 		bnxt_ulp_stop(bp);
-		rc = bnxt_close_nic(bp, true, false);
-		if (rc) {
-			etest->flags |= ETH_TEST_FL_FAILED;
-			bnxt_ulp_start(bp, rc);
-			return;
-		}
+		bnxt_close_nic(bp, true, false);
 		bnxt_run_fw_tests(bp, test_mask, &test_results);
 
 		buf[BNXT_MACLPBK_TEST_IDX] = 1;

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

@@ -521,9 +521,8 @@ static int bnxt_hwrm_ptp_cfg(struct bnxt *bp)
 
 	if (netif_running(bp->dev)) {
 		if (ptp->rx_filter == HWTSTAMP_FILTER_ALL) {
-			rc = bnxt_close_nic(bp, false, false);
-			if (!rc)
-				rc = bnxt_open_nic(bp, false, false);
+			bnxt_close_nic(bp, false, false);
+			rc = bnxt_open_nic(bp, false, false);
 		} else {
 			bnxt_ptp_cfg_tstamp_filters(bp);
 		}