linux-kernel - Re: [PATCH] block: prevent deadlock in del

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Message-ID: <CALkFLLLTBfLxtq0Euz6tYb0gwgDs37P8_TmfNQ8qaPZ5D9SuMA@mail.gmail.com>
Date: Wed, 6 Aug 2025 20:47:27 +0530
From: Ujwal Kundur <ujwal.kundur@...il.com>
To: Yu Kuai <yukuai1@...weicloud.com>
Cc: Hillf Danton <hdanton@...a.com>, axboe@...nel.dk, ming.lei@...hat.com, 
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzbot+2e9e529ac0b319316453@...kaller.appspotmail.com, 
	"yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH] block: prevent deadlock in del_gendisk()

> This problem is already fixed inside nbd by:
> 8b428f42f3ed ("nbd: fix lockdep deadlock warning")

Thanks for letting me know.

Would this patch still make sense as it narrows the scope of the
read-critical section? It reduces the chances of holding other locks
while trying to update the number of hw queues (and thus avoids more
lockdep warnings for this particular lock in the future).

Thanks,
Ujwal