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When setting an adapter online for the first time, we also create a couple of entries for it in the sysfs device tree. This is also true even if the adapter has not yet ever gone successfully through exchange config and exchange port data. When moving the scsi host object allocation and registration to after the first exchange config and exchange port data, this make the `port_rescan` attribute susceptible to invalid pointer-dereferences of the shost field before the adapter is fully initialized. When written to, it schedules a `scan_work` item that will in turn make use of the associated fibre channel host object to check the topology used for this FCP device. Because scanning for remote ports can't be done successfully without completing exchange config and exchange port data first, we can simply fence `port_rescan`, and so prevent the illegal access. As with cases where we can't get a reference to the adapter, we also return -ENODEV here. Applications need to handle that errno today already. After a successful allocation of the scsi host object nothing changes in the work flow. Link: https://lore.kernel.org/r/ef65366d309993ca91b6917727590ca7ca166c8f.1588956679.git.bblock@linux.ibm.com Reviewed-by: Steffen Maier <maier@linux.ibm.com> Signed-off-by: Benjamin Block <bblock@linux.ibm.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.