[RESEND] [PATCH v3] cxl: Prevent adapter reset if an active context exists

[Andrew Donnellan]

On 05/11/16 00:15, Uma Krishnan wrote:
> Frederic/Andrew,
>
> Just recently this issue has been reported by system test without any
> of the two patches you are suspecting - this patch nor the lspci patch.
> I was hoping the lspci patch from Andrew can possibly solve it.
> System test CQ is SW370625. The stack reported in that is same,
>
> [ 5895.245959] EEH: PHB#2 failure detected, location: N/A
> [ 5895.246078] CPU: 19 PID: 121774 Comm: lspci Not tainted
> 3.10.0-514.el7.ppc64le #1
> [ 5895.246240] Call Trace:
> [ 5895.246307] [c0000009f3707a60] [c000000000017ce0]
> show_stack+0x80/0x330 (unreliable)
> [ 5895.246501] [c0000009f3707b10] [c0000000009b22f4]
> dump_stack+0x30/0x44
> [ 5895.246665] [c0000009f3707b30] [c00000000003b9ac]
> eeh_dev_check_failure+0x21c/0x580
> [ 5895.246855] [c0000009f3707bd0] [c0000000000879dc]
> pnv_pci_read_config+0xbc/0x160
> [ 5895.247045] [c0000009f3707c10] [c000000000527d54]
> pci_user_read_config_dword+0x84/0x160
> [ 5895.247233] [c0000009f3707c60] [c000000000547224]
> pci_read_config+0xf4/0x2e0
> [ 5895.247398] [c0000009f3707ce0] [c0000000003efb3c] read+0x10c/0x2a0
> [ 5895.247561] [c0000009f3707da0] [c00000000031d160]
> vfs_read+0x110/0x290
> [ 5895.247726] [c0000009f3707de0] [c00000000031ec70]
> SyS_pread64+0xb0/0xd0

This isn't a WARN - this stack trace is printed explicitly by the EEH 
code in the case of a PHB failure. arch/powerpc/kernel/eeh.c, line 403.


Andrew

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan at au1.ibm.com  IBM Australia Limited