[PATCH 1/2] cxlflash: Verify problem state area is mapped before notifying shutdown

[Matthew R. Ochs]

> On Jul 21, 2016, at 3:44 PM, Uma Krishnan <ukrishn at linux.vnet.ibm.com> wrote:
> 
> If an EEH or some other hard error occurs while the
> adapter instance was being initialized, on the subsequent
> shutdown of the device, the system could crash with:
> 
> [c000000f1da03b60] c0000000005eccfc pci_device_shutdown+0x6c/0x100
> [c000000f1da03ba0] c0000000006d67d4 device_shutdown+0x1b4/0x2c0
> [c000000f1da03c40] c0000000000ea30c kernel_restart_prepare+0x5c/0x80
> [c000000f1da03c70] c0000000000ea48c kernel_restart+0x2c/0xc0
> [c000000f1da03ce0] c0000000000ea970 SyS_reboot+0x1c0/0x2d0
> [c000000f1da03e30] c000000000009204 system_call+0x38/0xb4
> 
> This crash is due to the AFU not being mapped when the shutdown
> notification routine is called and is a regression that was inserted
> recently with Commit 704c4b0ddc03 ("cxlflash: Shutdown notify support
> for CXL Flash cards").
> 
> As a fix, shutdown notification should only occur when the AFU is mapped.
> 
> Fixes: 704c4b0ddc03 ("cxlflash: Shutdown notify support for CXL Flash cards")
> Signed-off-by: Uma Krishnan <ukrishn at linux.vnet.ibm.com>

Acked-by: Matthew R. Ochs <mrochs at linux.vnet.ibm.com>