netdev - [PATCH net v3 2/2] net: ethernet: ti: am65-cpsw: fix warning in am65_cpsw_nuss_remove_rx

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Message-Id: <20241101-am65-cpsw-multi-rx-j7-fix-v3-2-338fdd6a55da@kernel.org>
Date: Fri, 01 Nov 2024 12:18:51 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, 
 Jesper Dangaard Brouer <hawk@...nel.org>, 
 John Fastabend <john.fastabend@...il.com>, Simon Horman <horms@...nel.org>, 
 Vignesh Raghavendra <vigneshr@...com>
Cc: Maxime Chevallier <maxime.chevallier@...tlin.com>, 
 Siddharth Vadapalli <s-vadapalli@...com>, 
 Md Danish Anwar <danishanwar@...com>, 
 Govindarajan Sriramakrishnan <srk@...com>, netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, bpf@...r.kernel.org, 
 Roger Quadros <rogerq@...nel.org>
Subject: [PATCH net v3 2/2] net: ethernet: ti: am65-cpsw: fix warning in
 am65_cpsw_nuss_remove_rx_chns()

flow->irq is initialized to 0 which is a valid IRQ. Set it to -EINVAL
in error path of am65_cpsw_nuss_init_rx_chns() so we do not try
to free an unallocated IRQ in am65_cpsw_nuss_remove_rx_chns().

If user tried to change number of RX queues and am65_cpsw_nuss_init_rx_chns()
failed due to any reason, the warning will happen if user tries to change
the number of RX queues after the error condition.

root@...2xx-evm:~# ethtool -L eth0 rx 3
[   40.385293] am65-cpsw-nuss 8000000.ethernet: set new flow-id-base 19
[   40.393211] am65-cpsw-nuss 8000000.ethernet: Failed to init rx flow2
netlink error: Invalid argument
root@...2xx-evm:~# ethtool -L eth0 rx 2
[   82.306427] ------------[ cut here ]------------
[   82.311075] WARNING: CPU: 0 PID: 378 at kernel/irq/devres.c:144 devm_free_irq+0x84/0x90
[   82.469770] Call trace:
[   82.472208]  devm_free_irq+0x84/0x90
[   82.475777]  am65_cpsw_nuss_remove_rx_chns+0x6c/0xac [ti_am65_cpsw_nuss]
[   82.482487]  am65_cpsw_nuss_update_tx_rx_chns+0x2c/0x9c [ti_am65_cpsw_nuss]
[   82.489442]  am65_cpsw_set_channels+0x30/0x4c [ti_am65_cpsw_nuss]
[   82.495531]  ethnl_set_channels+0x224/0x2dc
[   82.499713]  ethnl_default_set_doit+0xb8/0x1b8
[   82.504149]  genl_family_rcv_msg_doit+0xc0/0x124
[   82.508757]  genl_rcv_msg+0x1f0/0x284
[   82.512409]  netlink_rcv_skb+0x58/0x130
[   82.516239]  genl_rcv+0x38/0x50
[   82.519374]  netlink_unicast+0x1d0/0x2b0
[   82.523289]  netlink_sendmsg+0x180/0x3c4
[   82.527205]  __sys_sendto+0xe4/0x158
[   82.530779]  __arm64_sys_sendto+0x28/0x38
[   82.534782]  invoke_syscall+0x44/0x100
[   82.538526]  el0_svc_common.constprop.0+0xc0/0xe0
[   82.543221]  do_el0_svc+0x1c/0x28
[   82.546528]  el0_svc+0x28/0x98
[   82.549578]  el0t_64_sync_handler+0xc0/0xc4
[   82.553752]  el0t_64_sync+0x190/0x194
[   82.557407] ---[ end trace 0000000000000000 ]---

Fixes: da70d184a8c3 ("net: ethernet: ti: am65-cpsw: Introduce multi queue Rx")
Signed-off-by: Roger Quadros <rogerq@...nel.org>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 70aea654c79f..ba6db61dd227 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2441,6 +2441,7 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
 		flow = &rx_chn->flows[i];
 		flow->id = i;
 		flow->common = common;
+		flow->irq = -EINVAL;

 		rx_flow_cfg.ring_rxfdq0_id = fdqring_id;
 		rx_flow_cfg.rx_cfg.size = max_desc_num;
@@ -2483,6 +2484,7 @@ static int am65_cpsw_nuss_init_rx_chns(struct am65_cpsw_common *common)
 		if (ret) {
 			dev_err(dev, "failure requesting rx %d irq %u, %d\n",
 				i, flow->irq, ret);
+			flow->irq = -EINVAL;
 			goto err;
 		}
 	}

-- 
2.34.1