linux-kernel - Re: [PATCH v3 4/8] pciehp: Don't disable the link permanently, during removal

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Message-ID: <20131218010207.GC15119@google.com>
Date:	Tue, 17 Dec 2013 18:02:07 -0700
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Rajat Jain <rajatjain.linux@...il.com>
Cc:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>,
	Guenter Roeck <groeck@...iper.net>,
	Rajat Jain <rajatjain@...iper.net>,
	Rajat Jain <rajatxjain@...il.com>, yinghai@...nel.org
Subject: Re: [PATCH v3 4/8] pciehp: Don't disable the link permanently,
 during removal

[+cc yinghai@...nel.org (seems to be Yinghai's preferred email]

On Tue, Dec 17, 2013 at 12:06:05PM -0800, Rajat Jain wrote:
> We need future link up events for hot-add, thus don't disable
> the link permanently during device removal. Also, remove the static
> functions that are now left unused.

The changelog should mention that this reverts part of 2debd9289997 ("PCI:
pciehp: Disable/enable link during slot power off/on").

Yinghai, can you tell us whether this is an issue on your systems?

> Signed-off-by: Rajat Jain <rajatjain@...iper.net>
> Signed-off-by: Guenter Roeck <groeck@...iper.net>
> ---
> v3: no change, created by splitting the patch v2 [2/4]
> v2: (non existent)
> v1: (non existent)
> 
>  drivers/pci/hotplug/pciehp_hpc.c |   18 ------------------
>  1 file changed, 18 deletions(-)
> 
> diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
> index b45b568..ab12555 100644
> --- a/drivers/pci/hotplug/pciehp_hpc.c
> +++ b/drivers/pci/hotplug/pciehp_hpc.c
> @@ -278,11 +278,6 @@ static void pcie_wait_link_active(struct controller *ctrl)
>  	__pcie_wait_link_active(ctrl, true);
>  }
>  
> -static void pcie_wait_link_not_active(struct controller *ctrl)
> -{
> -	__pcie_wait_link_active(ctrl, false);
> -}
> -
>  static bool pci_bus_check_dev(struct pci_bus *bus, int devfn)
>  {
>  	u32 l;
> @@ -383,11 +378,6 @@ static int pciehp_link_enable(struct controller *ctrl)
>  	return __pciehp_link_set(ctrl, true);
>  }
>  
> -static int pciehp_link_disable(struct controller *ctrl)
> -{
> -	return __pciehp_link_set(ctrl, false);
> -}
> -
>  int pciehp_get_attention_status(struct slot *slot, u8 *status)
>  {
>  	struct controller *ctrl = slot->ctrl;
> @@ -620,14 +610,6 @@ int pciehp_power_off_slot(struct slot * slot)
>  	u16 cmd_mask;
>  	int retval;
>  
> -	/* Disable the link at first */
> -	pciehp_link_disable(ctrl);
> -	/* wait the link is down */
> -	if (ctrl->link_active_reporting)
> -		pcie_wait_link_not_active(ctrl);
> -	else
> -		msleep(1000);
> -
>  	slot_cmd = POWER_OFF;
>  	cmd_mask = PCI_EXP_SLTCTL_PCC;
>  	retval = pcie_write_cmd(ctrl, slot_cmd, cmd_mask);
> -- 
> 1.7.9.5
> 
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