netdev - [PATCH net-next 3/4] ice: remove unused buffer copy code in ice_sq_send_cmd

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Date:   Sat,  1 Apr 2023 19:26:58 +0200
From:   Michal Schmidt <mschmidt@...hat.com>
To:     intel-wired-lan@...ts.osuosl.org
Cc:     netdev@...r.kernel.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Michal Michalik <michal.michalik@...el.com>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        Karol Kolacinski <karol.kolacinski@...el.com>,
        Petr Oros <poros@...hat.com>
Subject: [PATCH net-next 3/4] ice: remove unused buffer copy code in ice_sq_send_cmd_retry()

The 'buf_cpy'-related code in ice_sq_send_cmd_retry() looks broken.
'buf' is nowhere copied into 'buf_cpy'.

The reason this does not cause problems is that all commands for which
'is_cmd_for_retry' is true go with a NULL buf.

Let's remove 'buf_cpy'. Add a WARN_ON in case the assumption no longer
holds in the future.

Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
---
 drivers/net/ethernet/intel/ice/ice_common.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/intel/ice/ice_common.c b/drivers/net/ethernet/intel/ice/ice_common.c
index 14cffe49fa8c..539b756f227c 100644
--- a/drivers/net/ethernet/intel/ice/ice_common.c
+++ b/drivers/net/ethernet/intel/ice/ice_common.c
@@ -1619,7 +1619,6 @@ ice_sq_send_cmd_retry(struct ice_hw *hw, struct ice_ctl_q_info *cq,
 {
 	struct ice_aq_desc desc_cpy;
 	bool is_cmd_for_retry;
-	u8 *buf_cpy = NULL;
 	u8 idx = 0;
 	u16 opcode;
 	int status;
@@ -1629,11 +1628,8 @@ ice_sq_send_cmd_retry(struct ice_hw *hw, struct ice_ctl_q_info *cq,
 	memset(&desc_cpy, 0, sizeof(desc_cpy));
 
 	if (is_cmd_for_retry) {
-		if (buf) {
-			buf_cpy = kzalloc(buf_size, GFP_KERNEL);
-			if (!buf_cpy)
-				return -ENOMEM;
-		}
+		/* All retryable cmds are direct, without buf. */
+		WARN_ON(buf);
 
 		memcpy(&desc_cpy, desc, sizeof(desc_cpy));
 	}
@@ -1645,17 +1641,12 @@ ice_sq_send_cmd_retry(struct ice_hw *hw, struct ice_ctl_q_info *cq,
 		    hw->adminq.sq_last_status != ICE_AQ_RC_EBUSY)
 			break;
 
-		if (buf_cpy)
-			memcpy(buf, buf_cpy, buf_size);
-
 		memcpy(desc, &desc_cpy, sizeof(desc_cpy));
 
 		mdelay(ICE_SQ_SEND_DELAY_TIME_MS);
 
 	} while (++idx < ICE_SQ_SEND_MAX_EXECUTE);
 
-	kfree(buf_cpy);
-
 	return status;
 }
 
-- 
2.39.2