linux-kernel - Re: [PATCH] cxl: Don't remove AFUs/vPHBs in cxl

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Date:	Tue, 29 Sep 2015 15:27:24 +1000
From:	Daniel Axtens <dja@...ens.net>
To:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	akpm@...ux-foundation.org, shuah.kh@...sung.com,
	stable@...r.kernel.org
Subject: Re: [PATCH] cxl: Don't remove AFUs/vPHBs in cxl_reset

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Hi,

Yep, this is OK. It broke because vPHB support was added in 4.2.

The commit message and title are technically slightly wrong as there are
no vPHBs, but I don't think that's serious.

Thanks Sudip!

Regards,
Daniel


Sudip Mukherjee <sudipm.mukherjee@...il.com> writes:

> From: Daniel Axtens <dja@...ens.net>
>
> commit 4e1efb403c1c016ae831bd9988a7d2e5e0af41a0 upstream.
>
> If the driver doesn't participate in EEH, the AFUs will be removed
> by cxl_remove, which will be invoked by EEH.
>
> If the driver does particpate in EEH, the vPHB needs to stick around
> so that the it can particpate.
>
> In both cases, we shouldn't remove the AFU/vPHB.
>
> Reviewed-by: Cyril Bur <cyrilbur@...il.com>
> Signed-off-by: Daniel Axtens <dja@...ens.net>
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
> Cc: <stable@...r.kernel.org> # 4.1.9
> ---
>  drivers/misc/cxl/pci.c | 3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
> index 9eab76c..4f1b0bd 100644
> --- a/drivers/misc/cxl/pci.c
> +++ b/drivers/misc/cxl/pci.c
> @@ -781,9 +781,6 @@ int cxl_reset(struct cxl *adapter)
>  
>  	dev_info(&dev->dev, "CXL reset\n");
>  
> -	for (i = 0; i < adapter->slices; i++)
> -		cxl_remove_afu(adapter->afu[i]);
> -
>  	/* pcie_warm_reset requests a fundamental pci reset which includes a
>  	 * PERST assert/deassert.  PERST triggers a loading of the image
>  	 * if "user" or "factory" is selected in sysfs */
> -- 
> 1.9.1
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