APPLIED: [SRU][J][PATCH 0/1] Kernel oops while removing device from cio_ignore list (LP: 1980951)

[Stefan Bader]

On 07.07.22 18:23, frank.heimes at canonical.com wrote:
> BugLink: https://bugs.launchpad.net/bugs/1980951
> 
> SRU Justification:
> 
> [Impact]
> 
>   * A kernel Oops occurs when a device is removed from the cio_ignore list
>     (that is used to hide ccw devices) on a system with non-I/O subchannels
>     (e.g. SCM or CHSC subchannels).
> 
>   * As a result, previously ignored devices cannot be activated again,
>     and new devices cannot be found.
> 
> [Fix]
> 
>   * 0c3812c347bf 0c3812c347bfb0dc213556a195e79850c55702f5 "s390/cio: derive cdev information only for IO-subchannels"
> 
> [Test Plan]
> 
>   * An IBM zSystems or LinuxONE LPAR with with non-I/O subchannels.
> 
>   * Ubuntu Server 22.04 LTS (with GA kernel 5.15) installed.
> 
>   * Define a cio_ignore list (to hide ccw devices).
> 
>   * Remove a device from the cio_ignore list.
> 
>   * Due to hardware requirements this test needs to be conducted by IBM.
> 
> [Where problems could occur]
> 
>   * General problems may occur with ccw device activation/deactivation
>     in case the new initialization is erroneous.
> 
>   * Issues may also have an impact on the type of ccw devices,
>     and may no longer be limited to non-I/O subchannels.
> 
>   * Things could still go wrong in case cdev is still not properly
>     derived from sch-type SUBCHANNEL_TYPE_IO.
> 
> [Other Info]
>   
>   * The commit is upstream since kernel 5.16 (next-20220315).
> 
> Vineeth Vijayan (1):
>    s390/cio: derive cdev information only for IO-subchannels
> 
>   drivers/s390/cio/css.c | 9 ++++++---
>   1 file changed, 6 insertions(+), 3 deletions(-)
> 

Applied to jammy:linux/master-next. Thanks.

-Stefan

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