linux-kernel - Re: [PATCH net] octeontx2-pf: Add missing mutex lock in otx2_get

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Message-ID: <20231128172053.GA43811@kernel.org>
Date:   Tue, 28 Nov 2023 17:20:53 +0000
From:   Simon Horman <horms@...nel.org>
To:     Subbaraya Sundeep <sbhatta@...vell.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kuba@...nel.org, davem@...emloft.net, pabeni@...hat.com,
        edumazet@...gle.com, sgoutham@...vell.com, gakula@...vell.com,
        hkelam@...vell.com
Subject: Re: [PATCH net] octeontx2-pf: Add missing mutex lock in
 otx2_get_pauseparam

On Sat, Nov 25, 2023 at 10:05:41PM +0530, Subbaraya Sundeep wrote:
> All the mailbox messages sent to AF needs to be guarded
> by mutex lock. Add the missing lock in otx2_get_pauseparam
> function.
> 
> Fixes: 75f36270990c ("octeontx2-pf: Support to enable/disable pause frames via ethtool")
> Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>

Hi,

I am wondering if the call to otx2_nix_config_bp()
in otx2_dcbnl_ieee_setpfc() also needs to be protected by mbox.lock.

And although not strictly related to this patch, while looking over this, I
noticed that in otx2_init_hw_resources() it appears that &mbox->lock may be
unlocked twice in some error paths.

e.g.
	/* Init Auras and pools used by NIX RQ, for free buffer ptrs */
	err = otx2_rq_aura_pool_init(pf);
	if (err) {
		mutex_unlock(&mbox->lock);
		goto err_free_nix_lf;
	}
	...
err_free_nix_lf:
	mutex_lock(&mbox->lock);
	...

...