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b581e472d9
Commit 24729b307e ("usb: gadget: f_fs: Fix race between aio_cancel()
and AIO request complete") moved the call to usb_ep_free_request() from
ffs_epfile_async_io_complete() to ffs_user_copy_worker().
In ffs_user_copy_worker(), ki_complete() is called before
usb_ep_free_request(). Once ki_complete() returns, ffs_aio_cancel() can
no longer be invoked for the completed kiocb, as ki_complete() removes it
from the &ctx->active_reqs list in aio.c. ffs_aio_cancel() only applies
to kiocb instances still present on this list.
The potential race between ki_complete() and ffs_aio_cancel() is already
guarded by the &ctx->ctx_lock spinlock in aio.c.
As a result, there is no race condition between the usb_ep_dequeue() call
in ffs_aio_cancel() and the usb_ep_free_request() call in
ffs_user_copy_worker(). Consequently, the spin lock/unlock operations on
&io_data->ffs->eps_lock are no longer necessary.
Signed-off-by: Ingo Rohloff <ingo.rohloff@lauterbach.com>
Link: https://lore.kernel.org/r/20250701113602.33402-2-ingo.rohloff@lauterbach.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.