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If a SCSI device handler module is loaded after some SCSI devices have already been probed (e.g. via request_module() by dm-multipath), the "access_state" and "preferred_path" sysfs attributes remain invisible for these devices, although the handler is attached and live. The reason is that the visibility is only checked when the sysfs attribute group is first created. This results in an inconsistent user experience depending on the load order of SCSI low-level drivers vs. device handler modules. This patch changes user space API: attempting to read the "access_state" or "preferred_path" attributes will now result in -EINVAL rather than -ENODEV for devices that have no device handler, and tests for the existence of these attributes will have a different result. Link: https://lore.kernel.org/r/20220127141351.30706-1-mwilck@suse.com Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Martin Wilck <mwilck@suse.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.