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: c0c050c58d84 ("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>

1 files changed, 4 insertions, 15 deletions

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index f3f384773ac0..5f67a7f94e7d 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/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;