linux-kernel - Re: [PATCH] ibmvnic: remove excessive irqsave

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Message-ID: <20210305041910.GA1396452@us.ibm.com>
Date:   Thu, 4 Mar 2021 20:19:10 -0800
From:   Sukadev Bhattiprolu <sukadev@...ux.ibm.com>
To:     angkery <angkery@....com>
Cc:     mpe@...erman.id.au, benh@...nel.crashing.org, paulus@...ba.org,
        drt@...ux.ibm.com, ljp@...ux.ibm.com, davem@...emloft.net,
        kuba@...nel.org, linuxppc-dev@...ts.ozlabs.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Junlin Yang <yangjunlin@...ong.com>
Subject: Re: [PATCH] ibmvnic: remove excessive irqsave

angkery [angkery@....com] wrote:
> From: Junlin Yang <yangjunlin@...ong.com>
> 
> ibmvnic_remove locks multiple spinlocks while disabling interrupts:
> spin_lock_irqsave(&adapter->state_lock, flags);
> spin_lock_irqsave(&adapter->rwi_lock, flags);
> 
> there is no need for the second irqsave,since interrupts are disabled
> at that point, so remove the second irqsave:
> spin_lock_irqsave(&adapter->state_lock, flags);
> spin_lock(&adapter->rwi_lock);
> 
> Generated by: ./scripts/coccinelle/locks/flags.cocci
> ./drivers/net/ethernet/ibm/ibmvnic.c:5413:1-18:
> ERROR: nested lock+irqsave that reuses flags from line 5404.
> 

Thanks. Please add

Fixes: 4a41c421f367 ("ibmvnic: serialize access to work queue on remove")

> Signed-off-by: Junlin Yang <yangjunlin@...ong.com>

Reviewed-by: Sukadev Bhattiprolu <sukadev@...ux.ibm.com>