linux-kernel - Re: [PATCH 1/2] scsi: ufs: Put SCSI host after remove it

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Message-ID: <2956b9c7-b019-e2b3-7a1b-7b796b724add@acm.org>
Date:   Sun, 15 Dec 2019 13:55:41 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     cang@...eaurora.org
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        rnayak@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, saravanak@...gle.com, salyzyn@...gle.com,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Venkat Gopalakrishnan <venkatg@...eaurora.org>,
        Tomas Winkler <tomas.winkler@...el.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] scsi: ufs: Put SCSI host after remove it

On 2019-12-14 14:24, cang@...eaurora.org wrote:
> How do you think if I replace my patch with below one?
> In this way, you can also move blk_cleanup_queue() behind
> cancel_work_sync(eh_work).
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index b5966fa..bd4ae75 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -8251,15 +8251,17 @@ void ufshcd_remove(struct ufs_hba *hba)
>         ufs_bsg_remove(hba);
>         ufs_sysfs_remove_nodes(hba->dev);
>         scsi_remove_host(hba->host);
> -       /* disable interrupts */
> -       ufshcd_disable_intr(hba, hba->intr_mask);
> -       ufshcd_hba_stop(hba, true);
> -
>         ufshcd_exit_clk_scaling(hba);
>         ufshcd_exit_clk_gating(hba);
>         if (ufshcd_is_clkscaling_supported(hba))
>                 device_remove_file(hba->dev,
> &hba->clk_scaling.enable_attr);
> +       cancel_work_sync(&hba->eeh_work);
> +       cancel_work_sync(&hba->eh_work);
> +       /* disable interrupts */
> +       ufshcd_disable_intr(hba, hba->intr_mask);
> +       ufshcd_hba_stop(hba, true);
>         ufshcd_hba_exit(hba);
> +       ufshcd_dealloc_host(hba);
>  }
>  EXPORT_SYMBOL_GPL(ufshcd_remove);

Hi Can,

To which kernel tree does the above patch apply? I'm asking this because
I don't see the recently added blk_cleanup_queue() calls in the above
patch. Please start from Martin's latest scsi-queue branch when
preparing SCSI patches.

Additionally, is it on purpose that there is no scsi_host_put() call in
the above code? I'd like to keep that call because without that call a
memory leak will occur when unloading the ufshcd-core kernel driver.

Thanks,

Bart.