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

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Message-ID: <20241105133042.GD4507@kernel.org>
Date: Tue, 5 Nov 2024 13:30:42 +0000
From: Simon Horman <horms@...nel.org>
To: Roger Quadros <rogerq@...nel.org>
Cc: 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>,
	Vignesh Raghavendra <vigneshr@...com>,
	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
Subject: Re: [PATCH net v3 2/2] net: ethernet: ti: am65-cpsw: fix warning in
 am65_cpsw_nuss_remove_rx_chns()

On Fri, Nov 01, 2024 at 12:18:51PM +0200, Roger Quadros wrote:
> 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")

Hi Roger,

I wonder if the problem predates the cited commit and was, rather,
introduced by:

Fixes: 24bc19b05f1f ("net: ethernet: ti: am65-cpsw: Add suspend/resume support")

...