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The commita69755b187("xtensa simdisk: switch to proc_create_data()") split read operation into two parts, first retrieving the path when it's non-null and second retrieving the trailing '\n'. However when the path is non-null the first simple_read_from_buffer updates ppos, and the second simple_read_from_buffer returns 0 if ppos is greater than 1 (i.e. almost always). As a result reading from that proc file is almost always empty. Fix it by making a temporary copy of the path with the trailing '\n' and using simple_read_from_buffer on that copy. Cc: stable@vger.kernel.org Fixes:a69755b187("xtensa simdisk: switch to proc_create_data()") Signed-off-by: Yi Yang <yiyang13@huawei.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.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.