netdev - RE: [PATCH V2 net] net: mana: Fix error handling in mana_create

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Message-ID:
 <CH2PPF910B3338DF57021943FF5799FCC75CA882@CH2PPF910B3338D.namprd21.prod.outlook.com>
Date: Fri, 23 Aug 2024 21:12:23 +0000
From: Haiyang Zhang <haiyangz@...rosoft.com>
To: Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>, KY Srinivasan
	<kys@...rosoft.com>, "wei.liu@...nel.org" <wei.liu@...nel.org>, Dexuan Cui
	<decui@...rosoft.com>, "davem@...emloft.net" <davem@...emloft.net>,
	"edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org"
	<kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>, Long Li
	<longli@...rosoft.com>, "yury.norov@...il.com" <yury.norov@...il.com>,
	"leon@...nel.org" <leon@...nel.org>, "cai.huoqing@...ux.dev"
	<cai.huoqing@...ux.dev>, "ssengar@...ux.microsoft.com"
	<ssengar@...ux.microsoft.com>, "vkuznets@...hat.com" <vkuznets@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "linux-hyperv@...r.kernel.org"
	<linux-hyperv@...r.kernel.org>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-rdma@...r.kernel.org"
	<linux-rdma@...r.kernel.org>
CC: Souradeep Chakrabarti <schakrabarti@...rosoft.com>
Subject: RE: [PATCH V2 net] net: mana: Fix error handling in
 mana_create_txq/rxq's NAPI cleanup



> -----Original Message-----
> From: Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>
> Sent: Friday, August 23, 2024 5:44 AM
> To: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; wei.liu@...nel.org; Dexuan Cui
> <decui@...rosoft.com>; davem@...emloft.net; edumazet@...gle.com;
> kuba@...nel.org; pabeni@...hat.com; Long Li <longli@...rosoft.com>;
> yury.norov@...il.com; leon@...nel.org; cai.huoqing@...ux.dev;
> ssengar@...ux.microsoft.com; vkuznets@...hat.com; tglx@...utronix.de;
> linux-hyperv@...r.kernel.org; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-rdma@...r.kernel.org
> Cc: Souradeep Chakrabarti <schakrabarti@...rosoft.com>; Souradeep
> Chakrabarti <schakrabarti@...ux.microsoft.com>
> Subject: [PATCH V2 net] net: mana: Fix error handling in
> mana_create_txq/rxq's NAPI cleanup
> 
> Currently napi_disable() gets called during rxq and txq cleanup,
> even before napi is enabled and hrtimer is initialized. It causes
> kernel panic.
> 
> ? page_fault_oops+0x136/0x2b0
>   ? page_counter_cancel+0x2e/0x80
>   ? do_user_addr_fault+0x2f2/0x640
>   ? refill_obj_stock+0xc4/0x110
>   ? exc_page_fault+0x71/0x160
>   ? asm_exc_page_fault+0x27/0x30
>   ? __mmdrop+0x10/0x180
>   ? __mmdrop+0xec/0x180
>   ? hrtimer_active+0xd/0x50
>   hrtimer_try_to_cancel+0x2c/0xf0
>   hrtimer_cancel+0x15/0x30
>   napi_disable+0x65/0x90
>   mana_destroy_rxq+0x4c/0x2f0
>   mana_create_rxq.isra.0+0x56c/0x6d0
>   ? mana_uncfg_vport+0x50/0x50
>   mana_alloc_queues+0x21b/0x320
>   ? skb_dequeue+0x5f/0x80
> 
> Fixes: e1b5683ff62e ("net: mana: Move NAPI from EQ to CQ")
> Signed-off-by: Souradeep Chakrabarti <schakrabarti@...ux.microsoft.com>

Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>

Please add:
Cc: stable@...r.kernel.org

Thanks.