linux-kernel - Re: [PATCH 1/2] Revert "scsi: core: Do not increase scsi_device's iorequest

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Date:   Mon, 15 May 2023 16:45:34 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Wenchao Hao <haowenchao2@...wei.com>
Cc:     "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linfeilong@...wei.com, louhongxiang@...wei.com
Subject: Re: [PATCH 1/2] Revert "scsi: core: Do not increase scsi_device's
 iorequest_cnt if dispatch failed"

On Mon, May 15, 2023 at 03:01:55PM +0800, Wenchao Hao wrote:
> the "atomic_inc(&cmd->device->iorequest_cnt)" in scsi_queue_rq() would
> causes kernel panic, because cmd->device may be freed after returning
> from scsi_dispatch_cmd().
> 
> This reverts commit cfee29ffb45b1c9798011b19d454637d1b0fe87d.
> 
> Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
> Reported-by: Ming Lei <ming.lei@...hat.com>
> Closes:https://lore.kernel.org/linux-scsi/8e0f2d31-e6ff-ec4a-3974-450560ad49c5@huawei.com/T/#t

Reviewed-by: Ming Lei <ming.lei@...hat.com>

Thanks,
Ming