linux.git/include/linux/uio_driver.h, branch v7.1-rc4

uio: replace deprecated mmap hook with mmap_prepare in uio_info

2026-04-05T20:53:44+00:00

The f_op->mmap interface is deprecated, so update uio_info to use its
successor, mmap_prepare.

Therefore, replace the uio_info->mmap hook with a new
uio_info->mmap_prepare hook, and update its one user, target_core_user,
to both specify this new mmap_prepare hook and also to use the new
vm_ops->mapped() hook to continue to maintain a correct udev->kref
refcount.

Then update uio_mmap() to utilise the mmap_prepare compatibility layer to
invoke this callback from the uio mmap invocation.

Link: https://lkml.kernel.org/r/157583e4477705b496896c7acd4ac88a937b8fa6.1774045440.git.ljs@kernel.org
Signed-off-by: Lorenzo Stoakes (Oracle) 
Acked-by: Vlastimil Babka (SUSE) 
Cc: Alexander Shishkin 
Cc: Alexandre Torgue 
Cc: Al Viro 
Cc: Arnd Bergmann 
Cc: Bodo Stroesser 
Cc: Christian Brauner 
Cc: Clemens Ladisch 
Cc: David Hildenbrand 
Cc: David Howells 
Cc: Dexuan Cui 
Cc: Greg Kroah-Hartman 
Cc: Haiyang Zhang 
Cc: Jan Kara 
Cc: Jann Horn 
Cc: Jonathan Corbet 
Cc: K. Y. Srinivasan 
Cc: Liam Howlett 
Cc: Long Li 
Cc: Marc Dionne 
Cc: "Martin K. Petersen" 
Cc: Maxime Coquelin 
Cc: Michal Hocko 
Cc: Mike Rapoport 
Cc: Miquel Raynal 
Cc: Pedro Falcato 
Cc: Richard Weinberger 
Cc: Ryan Roberts 
Cc: Suren Baghdasaryan 
Cc: Vignesh Raghavendra 
Cc: Wei Liu 
Signed-off-by: Andrew Morton

treewide: Update email address

2026-01-11T16:09:11+00:00

In a vain attempt to consolidate the email zoo switch everything to the
kernel.org account.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Linus Torvalds

uio: introduce UIO_MEM_DMA_COHERENT type

2024-03-07T21:52:59+00:00

Add a UIO memtype specifically for sharing dma_alloc_coherent
memory with userspace, backed by dma_mmap_coherent.

This is mainly for the bnx2/bnx2x/bnx2i "cnic" interface, although there
are a few other uio drivers which map dma_alloc_coherent memory and will
be converted to use dma_mmap_coherent as well.

Signed-off-by: Nilesh Javali 
Signed-off-by: Chris Leech 
Reviewed-by: Christoph Hellwig 
Link: https://lore.kernel.org/r/20240205200137.138302-1-cleech@redhat.com
Signed-off-by: Greg Kroah-Hartman

uio: fix some kernel-doc markups

2020-11-09T17:39:36+00:00

The definitions for (devm_)uio_register_device should be
at the header file, as the macros are there. The ones
inside uio.c refer, instead, to __(devm_)uio_register_device.

Update them and add new kernel-doc markups for the macros.

Signed-off-by: Mauro Carvalho Chehab 
Link: https://lore.kernel.org/r/82ab7b68d271aeda7396e369ff8a629491b9d628.1603469755.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman

uio: add resource managed devm_uio_register_device() function

2020-03-18T11:34:10+00:00

This change adds a resource managed equivalent of uio_register_device().
Not adding devm_uio_unregister_device(), since the intent is to discourage
it's usage. Having such a function may allow some bad driver designs. Most
users of devm_*register*() functions rarely use the unregister equivalents.

Signed-off-by: Alexandru Ardelean 
Link: https://lore.kernel.org/r/20200306161853.25368-1-alexandru.ardelean@analog.com
Signed-off-by: Greg Kroah-Hartman

UIO: fix up inapposite whiteplace in uio head file

2020-03-18T11:34:10+00:00

Whitespace is used in the inapposite place,
which makes checkpatch complain.

Signed-off-by: Qiang Su 
Link: https://lore.kernel.org/r/20200306070359.71398-1-suqiang4@huawei.com
Signed-off-by: Greg Kroah-Hartman

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 305

2019-06-05T15:37:04+00:00

Based on 1 normalized pattern(s):

  licensed under the gplv2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 6 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Alexios Zavras 
Reviewed-by: Kate Stewart 
Reviewed-by: Allison Randal 
Reviewed-by: Armijn Hemel 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190530000433.961827334@linutronix.de
Signed-off-by: Greg Kroah-Hartman

uio: introduce UIO_MEM_IOVA

2018-09-25T18:33:24+00:00

Introduce the concept of mapping physical memory locations that
are normal memory. The new type UIO_MEM_IOVA are similar to
existing UIO_MEM_PHYS but the backing memory is not marked as uncached.

Also, indent related switch to the currently used style.

Signed-off-by: Stephen Hemminger 
Signed-off-by: Greg Kroah-Hartman

uio: change to use the mutex lock instead of the spin lock

2018-07-07T14:57:35+00:00

We are hitting a regression with the following commit:

commit a93e7b331568227500186a465fee3c2cb5dffd1f
Author: Hamish Martin 
Date:   Mon May 14 13:32:23 2018 +1200

    uio: Prevent device destruction while fds are open

The problem is the addition of spin_lock_irqsave in uio_write. This
leads to hitting  uio_write -> copy_from_user -> _copy_from_user ->
might_fault and the logs filling up with sleeping warnings.

I also noticed some uio drivers allocate memory, sleep, grab mutexes
from callouts like open() and release and uio is now doing
spin_lock_irqsave while calling them.

Reported-by: Mike Christie 
CC: Hamish Martin 
Reviewed-by: Hamish Martin 
Signed-off-by: Xiubo Li 
Signed-off-by: Greg Kroah-Hartman

uio: Prevent device destruction while fds are open

2018-05-14T14:16:35+00:00

Prevent destruction of a uio_device while user space apps hold open
file descriptors to that device. Further, access to the 'info' member
of the struct uio_device is protected by spinlock. This is to ensure
stale pointers to data not under control of the UIO subsystem are not
dereferenced.

Signed-off-by: Hamish Martin 
Reviewed-by: Chris Packham 
Signed-off-by: Greg Kroah-Hartman