linux-kernel - Re: [PATCH net 1/1] net/mlx5: Clean up only new IRQ glue on request

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Message-ID: <9022a20f-47a7-47f2-9d87-b242cf75b55a@intel.com>
Date: Wed, 2 Jul 2025 10:58:21 -0700
From: Jacob Keller <jacob.e.keller@...el.com>
To: Mohith Kumar Thummaluru <mohith.k.kumar.thummaluru@...cle.com>,
	"saeedm@...dia.com" <saeedm@...dia.com>, "leon@...nel.org" <leon@...nel.org>,
	"tariqt@...dia.com" <tariqt@...dia.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>
CC: "andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, "davem@...emloft.net"
	<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"shayd@...dia.com" <shayd@...dia.com>, "elic@...dia.com" <elic@...dia.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Anand Khoje
	<anand.a.khoje@...cle.com>, Manjunath Patil <manjunath.b.patil@...cle.com>,
	Rama Nichanamatlu <rama.nichanamatlu@...cle.com>, Rajesh Sivaramasubramaniom
	<rajesh.sivaramasubramaniom@...cle.com>, Rohit Sajan Kumar
	<rohit.sajan.kumar@...cle.com>, Moshe Shemesh <moshe@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, Qing Huang <qing.huang@...cle.com>
Subject: Re: [PATCH net 1/1] net/mlx5: Clean up only new IRQ glue on
 request_irq() failure



On 6/26/2025 11:50 PM, Mohith Kumar Thummaluru wrote:
> The mlx5_irq_alloc() function can inadvertently free the entire rmap
> and end up in a crash[1] when the other threads tries to access this,
> when request_irq() fails due to exhausted IRQ vectors. This commit
> modifies the cleanup to remove only the specific IRQ mapping that was
> just added.
> 
> This prevents removal of other valid mappings and ensures precise
> cleanup of the failed IRQ allocation's associated glue object.
> 
> Note: This error is observed when both fwctl and rds configs are enabled.
> 
FWIW, figured i should add it here:

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>


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