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There's no point to the MPATHF_RETAIN_ATTACHED_HW_HANDLER flag any more. The way setup_scsi_dh() worked, if that flag wasn't set, it would attempt to attach any passed in hardware handler. This would always fail if a different hardware handler was attached, which caused setup_scsi_dh() to rerun as if the flag was set. So the code would already retain any attached handler, because attaching a different one would always fail. Also, the code had a bug. If attached_handler_name was NULL but there was a scsi device handler attached (because either scsi_dh_attached_handler_name failed() to allocate a name, a handler got attached after it was called) the code would loop endlessly. Instead, ignore MPATHF_RETAIN_ATTACHED_HW_HANDLER, and always free the passed in handler if *attached_handler_name is set. This simplifies the code, and avoids the endless loop bug, while keeping the functionality the same. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.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 reStructuredText 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.