Hi Geert
Thank for your reply.
On 2015年12月18日 19:27, Ulf Hansson wrote:
On 18 December 2015 at 10:33, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
Hi Dung-san,
CC Ulf
On Mon, Dec 14, 2015 at 3:34 AM, Nguyen Viet Dung <nv-dung@xxxxxxxxxxx> wrote:
While is testting LTSI-v4.1.13-rc1, we have found the following the failure
of mmcif.
1. mount mmc block
2. write data to mmc block
3. suspend/resume
4. write data to mmc block one again => happen kernel panic
(Probability in this test procedure is 100%)
We have used git bisect to find cause of failure in LTS-v4.1.13 to
LTSI-v4.1.13-rc1
and have found commit which cause failure.
(On LTS-v4.1.13 has not this failure)
drivers: sh: Disable PM runtime for multi-platform ARM with genpd
commit :cbc41d0a761bffb3166a413a3c77100a737c0cd7
That means there's a bug in Runtime PM handling of the sh_mmcif driver, or
in the MMC subsystem.
Usually such bugs cause a kernel hang on register access, not a NULL pointer
dereference, though.
Agree!
I doubt the bisected commit is where the *real* issue is. Looking into
the details for how system PM and runtime PM is deployed in sh_mmcif,
I believe some improvements are needed.
Actually, I made an attempt to modernize the PM code for sh_mmcif a while ago.
http://marc.info/?l=linux-mmc&m=138245085523815&w=2
Whether that fixes the problem reported here, I have no idea. Although
if not, it should move the code to a position where it becomes easier
to properly fix this issue.
I am willing to help and rebase that patchset, but I require help in
testing since I haven't been able to get a hold of a HW. Can I count
on that?
Yes , I can help you test.
If you have rebased patchset, phease tell me.
Best regards,
Nguyen Viet Dung
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