linux-kernel - Re: [PATCH V4] scsi: hpsa: drop shutdown callback

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Message-ID: <9516f507-9c3e-cce0-5557-c5c17388f404@codeaurora.org>
Date:   Fri, 1 Jun 2018 09:47:17 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     linux-pci@...r.kernel.org, ryan@...nie.org, timur@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, stable@...r.kernel.org,
        Don Brace <don.brace@...rosemi.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "open list:HEWLETT-PACKARD SMART ARRAY RAID DRIVER (hpsa)" 
        <esc.storagedev@...rosemi.com>,
        "open list:HEWLETT-PACKARD SMART ARRAY RAID DRIVER (hpsa)" 
        <linux-scsi@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V4] scsi: hpsa: drop shutdown callback

On 6/1/2018 9:46 AM, Sinan Kaya wrote:
> 'Commit cc27b735ad3a ("PCI/portdrv: Turn off PCIe services during
> shutdown")' has been added to kernel to shutdown pending PCIe port
> service interrupts during reboot so that a newly started kexec kernel
> wouldn't observe pending interrupts.
> 
> pcie_port_device_remove() is disabling the root port and switches by
> calling pci_disable_device() after all PCIe service drivers are shutdown.
> 
> This has been found to cause crashes on HP DL360 Gen9 machines during
> reboot due to hpsa driver not clearing the bus master bit during the
> shutdown procedure by calling pci_disable_device().
> 
> Disable device as part of the shutdown sequence.

Forgot to change the commit title. Apologies for that. The rest of the
patch should work. Waiting for tested-bys.

> 
> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=199779
> Fixes: cc27b735ad3a ("PCI/portdrv: Turn off PCIe services during shutdown")
> Cc: stable@...r.kernel.org
> Reported-by: Ryan Finnie <ryan@...nie.org>
> ---
>  drivers/scsi/hpsa.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
> index 3a9eca1..b92f86a 100644
> --- a/drivers/scsi/hpsa.c
> +++ b/drivers/scsi/hpsa.c
> @@ -8869,7 +8869,7 @@ static void hpsa_disable_rld_caching(struct ctlr_info *h)
>  	kfree(options);
>  }
>  
> -static void hpsa_shutdown(struct pci_dev *pdev)
> +static void __hpsa_shutdown(struct pci_dev *pdev)
>  {
>  	struct ctlr_info *h;
>  
> @@ -8884,6 +8884,12 @@ static void hpsa_shutdown(struct pci_dev *pdev)
>  	hpsa_disable_interrupt_mode(h);		/* pci_init 2 */
>  }
>  
> +static void hpsa_shutdown(struct pci_dev *pdev)
> +{
> +	__hpsa_shutdown(pdev);
> +	pci_disable_device(pdev);
> +}
> +
>  static void hpsa_free_device_info(struct ctlr_info *h)
>  {
>  	int i;
> @@ -8927,7 +8933,7 @@ static void hpsa_remove_one(struct pci_dev *pdev)
>  		scsi_remove_host(h->scsi_host);		/* init_one 8 */
>  	/* includes hpsa_free_irqs - init_one 4 */
>  	/* includes hpsa_disable_interrupt_mode - pci_init 2 */
> -	hpsa_shutdown(pdev);
> +	__hpsa_shutdown(pdev);
>  
>  	hpsa_free_device_info(h);		/* scan */
>  
> 


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.