This patch is designed to address a possible issue where an interrupt is
fired but not yet handled by the i2c-qup driver and the kernel goes down
as kexec prepares to start a secondary kernel. In this case it is
possible the interrupt will be left unhandled.
This is not unique to the i2c-qup driver, similar patches have gone into
other drivers such as the following for the arm-smmu-v3 driver.
commit 7aa8619a66aea52b145e04cbab4f8d6a4e5f3f3b
Author: Nate Watterson <nwatters@xxxxxxxxxxxxxx>
Date: Thu Jun 29 18:18:15 2017 -0400
iommu/arm-smmu-v3: Implement shutdown method
The shutdown method disables the SMMU to avoid corrupting a new kernel
started with kexec.
Signed-off-by: Nate Watterson <nwatters@xxxxxxxxxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
On 2/2/2018 4:36 PM, Bjorn Andersson wrote:
On Tue 16 Jan 13:35 PST 2018, Austin Christ wrote:
This shutdown method disables I2C to avoid corrupting a new kernel
started with kexec.
Can you elaborate on the issue you're seeing here? In what way is the
i2c-qup driver special, will there be similar patches for all other
drivers in the system?
Regards,
Bjorn
--
Qualcomm Datacenter Technologies as an affiliate of Qualcomm
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
