Okash Khawaja
12e84c71b7
tty: export tty_open_by_driver ...
This exports tty_open_by_driver so that it can be called from other
places inside the kernel. The checks for null file pointer are based on
Alan Cox's patch here:
http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1215095.html .
Description below is quoted from it:
"[RFC] tty_port: allow a port to be opened with a tty that has no file handle
Let us create tty objects entirely in kernel space. Untested proposal to
show why all the ideas around rewriting half the uart stack are not needed.
With this a kernel created non file backed tty object could be used to handle
data, and set terminal modes. Not all ldiscs can cope with this as N_TTY in
particular has to work back to the fs/tty layer.
The tty_port code is however otherwise clean of file handles as far as I can
tell as is the low level tty port write path used by the ldisc, the
configuration low level interfaces and most of the ldiscs.
Currently you don't have any exposure to see tty hangups because those are
built around the file layer. However a) it's a fixed port so you probably
don't care about that b) if you do we can add a callback and c) you almost
certainly don't want the userspace tear down/rebuild behaviour anyway.
This should however be sufficient if we wanted for example to enumerate all
the bluetooth bound fixed ports via ACPI and make them directly available.
It doesn't deal with the case of a user opening a port that's also kernel
opened and that would need some locking out (so it returned EBUSY if bound
to a kernel device of some kind). That needs resolving along with how you
"up" or "down" your new bluetooth device, or enumerate it while providing
the existing tty API to avoid regressions (and to debug)."
The exported funtion is used later in this patch set to gain access to tty_struct.
[changed export symbol level - gkh]
Signed-off-by: Okash Khawaja <okash.khawaja@gmail.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-05-16 14:04:49 +02:00
Merge branch 'topic/pl330' into for-linus
2017-05-04 16:08:52 +05:30
scripts/spelling.txt: add regsiter -> register spelling mistake
2017-05-08 17:15:13 -07:00
can: complete initial namespace support
2017-04-25 09:04:29 +02:00
ceph: fix file open flags on ppc64
2017-05-04 09:19:24 +02:00
firmware /meson
This is the bulk of GPIO changes for the v4.12 kernel cycle:
2017-05-04 12:05:32 -07:00
Merge branch 'for-4.12/asus' into for-linus
2017-05-02 11:02:41 +02:00
Second round of KVM/ARM Changes for v4.12.
2017-05-09 12:51:49 +02:00
pci-v4.12-changes
2017-05-08 19:03:25 -07:00
treewide: spelling: correct diffrent[iate] and banlance typos
2017-05-08 17:15:13 -07:00
Updates #2 for 4.12 kernel merge window
2017-05-08 20:07:29 -07:00
mmc: core: Export API to allow hosts to get the card address
2017-04-24 21:49:15 +02:00
MTD updates for 4.12-rc1:
2017-05-11 10:44:22 -07:00
ebtables: remove nf_hook_register usage
2017-04-26 09:30:21 +02:00
This is the bulk of pin control changes for the v4.12 cycle:
2017-05-02 17:59:33 -07:00
fbdev changes for v4.12:
2017-05-11 11:12:26 -07:00
power: supply: max17042_battery: Add support for the STATUS property
2017-05-01 12:37:29 +02:00
qed*: Fix possible overflow for status block id field.
2017-05-04 12:31:02 -04:00
Merge remote-tracking branches 'regulator/topic/notifier', 'regulator/topic/pfuze100', 'regulator/topic/settle', 'regulator/topic/tps65132' and 'regulator/topic/twl6030' into regulator-next
2017-04-30 22:17:36 +09:00
mm: introduce memalloc_noreclaim_{save,restore}
2017-05-08 17:15:15 -07:00
USB patches for 4.12-rc1
2017-05-04 18:03:51 -07:00
Merge remote-tracking branches 'spi/topic/ti-qspi' and 'spi/topic/xlp' into spi-next
2017-04-26 15:58:22 +01:00
NFSv4: Fix callback server shutdown
2017-04-27 18:00:16 -04:00
USB patches for 4.12-rc1
2017-05-04 18:03:51 -07:00
IOMMU Updates for Linux v4.12
2017-05-09 15:15:47 -07:00
IOMMU Updates for Linux v4.12
2017-05-09 15:15:47 -07:00
libata: remove SCT WRITE SAME support
2017-04-28 18:09:59 -04:00
audit: Use timespec64 to represent audit timestamps
2017-05-02 10:16:05 -04:00
Merge branch 'md-next' into md-linus
2017-05-01 14:09:21 -07:00
blk-mq-debugfs: allow schedulers to register debugfs attributes
2017-05-04 08:24:40 -06:00
Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
2017-05-12 15:43:10 -07:00
fs: remove _submit_bh()
2017-04-26 23:54:06 -04:00
Merge branch 'for-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2017-05-01 13:52:24 -07:00
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-05-01 16:15:18 -07:00
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2017-05-03 08:50:52 -07:00
cpumask: make "nr_cpumask_bits" unsigned
2017-05-08 17:15:11 -07:00
ia64: reuse append_elf_note() and final_note() functions
2017-05-08 17:15:11 -07:00
Merge branch 'akpm' (patches from Andrew)
2017-05-13 09:49:35 -07:00
thermal: devfreq_cooling: add new interface for direct power read
2017-05-05 15:54:45 +08:00
libnvdimm for 4.12
2017-05-05 18:49:20 -07:00
Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next
2017-05-04 18:06:17 +02:00
x86, iommu/vt-d: Add an option to disable Intel IOMMU force on
2017-04-26 23:57:53 +02:00
blk-mq-debugfs: allow schedulers to register debugfs attributes
2017-05-04 08:24:40 -06:00
ia64: reuse append_elf_note() and final_note() functions
2017-05-08 17:15:11 -07:00
f2fs: introduce CP_TRIMMED_FLAG to avoid unneeded discard
2017-05-03 10:04:56 -07:00
fs: add a VALID_OPEN_FLAGS
2017-04-27 05:13:04 -04:00
include/linux/filter.h: use set_memory.h header
2017-05-08 17:15:14 -07:00
time: delete current_fs_time()
2017-05-12 15:57:15 -07:00
fscrypt: remove fscrypt_symlink_data_len()
2017-04-30 01:26:34 -04:00
fscrypt: introduce helper function for filename matching
2017-05-04 11:44:37 -04:00
fscrypt: correct collision claim for digested names
2017-05-04 11:44:41 -04:00
scripts/spelling.txt: add regsiter -> register spelling mistake
2017-05-08 17:15:13 -07:00
mm: fix spelling error
2017-05-03 15:52:10 -07:00
Merge branches 'for-4.11/upstream-fixes', 'for-4.12/accutouch', 'for-4.12/cp2112', 'for-4.12/hid-core-null-state-handling', 'for-4.12/hiddev', 'for-4.12/i2c-hid', 'for-4.12/innomedia', 'for-4.12/logitech-hidpp-battery-power-supply', 'for-4.12/multitouch', 'for-4.12/nti', 'for-4.12/upstream' and 'for-4.12/wacom' into for-linus
2017-05-02 11:01:10 +02:00
char/misc patches for 4.12-rc1
2017-05-04 19:15:35 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2017-05-03 12:38:20 -07:00
mac80211: Add support for BSS max idle period element
2017-04-28 12:28:45 +02:00
bridge: add per-port broadcast flood flag
2017-04-27 16:34:29 -04:00
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2017-05-03 08:50:52 -07:00
ext2, ext4, xfs: retrieve dax_device for iomap operations
2017-04-25 13:20:46 -07:00
Merge branches 'arm/exynos', 'arm/omap', 'arm/rockchip', 'arm/mediatek', 'arm/smmu', 'arm/core', 'x86/vt-d', 'x86/amd' and 'core' into next
2017-05-04 18:06:17 +02:00
sysv,ipc: cacheline align kern_ipc_perm
2017-05-08 17:15:12 -07:00
jbd2: mark the transaction context with the scope GFP_NOFS context
2017-05-03 15:52:09 -07:00
jiffies.h: declare jiffies and jiffies_64 with ____cacheline_aligned_in_smp
2017-05-08 17:15:10 -07:00
Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
2017-05-02 15:53:46 -07:00
crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE
2017-05-08 17:15:11 -07:00
powerpc updates for 4.12 part 1.
2017-05-05 11:36:44 -07:00
kref: remove WARN_ON for NULL release functions
2017-05-08 17:15:14 -07:00
mm: make rmap_walk() return void
2017-05-03 15:52:10 -07:00
Second round of KVM Changes for v4.12:
2017-05-10 11:29:23 -07:00
libnvdimm: convert NDD_ flags to use bitops, introduce NDD_LOCKED
2017-05-04 14:01:24 -07:00
mm: memcontrol: use node page state naming scheme for memcg
2017-05-03 15:52:11 -07:00
include/linux/migrate.h: add arg names to prototype
2017-05-03 15:52:10 -07:00
treewide: use kv[mz]alloc* rather than opencoded variants
2017-05-08 17:15:13 -07:00
mm, compaction: change migrate_async_suitable() to suitable_migration_source()
2017-05-08 17:15:10 -07:00
Modules updates for v4.12
2017-05-03 19:12:27 -07:00
libnvdimm: add an atomic vs process context flag to rw_bytes
2017-05-10 21:46:22 -07:00
xdp: propagate extended ack to XDP setup
2017-05-01 10:35:47 -04:00
xdp: use common helper for netlink extended ack reporting
2017-05-03 09:51:24 -04:00
NFSv4: Don't special case "launder"
2017-04-26 13:03:04 -04:00
NFS client updates for Linux 4.12
2017-05-10 13:03:38 -07:00
NFS append COMMIT after synchronous COPY
2017-05-08 19:01:06 -04:00
powerpc updates for 4.12 part 1.
2017-05-05 11:36:44 -07:00
IOMMU Updates for Linux v4.12
2017-05-09 15:15:47 -07:00
of/fdt: introduce of_scan_flat_dt_subnodes and of_get_flat_dt_phandle
2017-05-09 22:55:58 +10:00
of: fix sparse warnings in fdt, irq, reserved mem, and resolver code
2017-05-04 14:01:13 -05:00
mm, page_alloc: count movable pages when stealing from pageblock
2017-05-08 17:15:10 -07:00
pci-v4.12-changes
2017-05-08 19:03:25 -07:00
PCI: Add device IDs for DRA74x and DRA72x
2017-04-28 10:23:19 -05:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2017-04-26 22:39:08 -04:00
ARM: SoC driver updates
2017-05-09 10:01:15 -07:00
PM / wakeup: Integrate mechanism to abort transitions in progress
2017-05-05 22:54:28 +02:00
x86, dax, pmem: remove indirection around memcpy_from_pmem()
2017-04-25 13:20:46 -07:00
crash: move crashkernel parsing and vmcore related code under CONFIG_CRASH_CORE
2017-05-08 17:15:11 -07:00
pidns: expose task pid_ns_for_children to userspace
2017-05-08 17:15:12 -07:00
ptr_ring: batch ring zeroing
2017-05-09 16:43:23 +03:00
srcu: Debloat the <linux/rcu_segcblist.h> header
2017-05-02 06:29:22 -07:00
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2017-05-10 10:30:46 -07:00
rhashtable: compact struct rhashtable_params
2017-05-01 16:22:40 -04:00
ring-buffer: Return reader page back into existing ring buffer
2017-05-01 10:26:40 -04:00
mm: remove SWAP_[SUCCESS|AGAIN|FAIL]
2017-05-03 15:52:10 -07:00
mm: remove rodata_test_data export, add pr_fmt
2017-05-03 15:52:09 -07:00
Staging/IIO patches for 4.12-rc1
2017-05-05 18:16:23 -07:00
sysv,ipc: cacheline align kern_ipc_perm
2017-05-08 17:15:12 -07:00
TTY/Serial patches for 4.12-rc1
2017-05-08 18:49:23 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
2017-05-02 16:40:27 -07:00
srcu: Make rcutorture writer stalls print SRCU GP state
2017-04-26 11:23:28 -07:00
srcu: Make rcutorture writer stalls print SRCU GP state
2017-04-26 11:23:28 -07:00
srcu: Specify auto-expedite holdoff time
2017-04-26 16:32:17 -07:00
libnvdimm for 4.12
2017-05-05 18:49:20 -07:00
ACPI / sleep: Ignore spurious SCI wakeups from suspend-to-idle
2017-05-05 22:54:28 +02:00
mm, swap: remove unused function prototype
2017-05-03 15:52:11 -07:00
tcp: switch rcv_rtt_est and rcvq_space to high resolution timestamps
2017-04-26 14:44:39 -04:00
A couple hardened usercopy changes:
2017-05-02 10:45:15 -07:00
time: delete CURRENT_TIME_SEC and CURRENT_TIME
2017-05-08 17:15:15 -07:00
tty: export tty_open_by_driver
2017-05-16 14:04:49 +02:00
include/linux/uaccess.h: remove expensive WARN_ON in pagefault_disabled_dec
2017-05-08 17:15:14 -07:00
virtio: virtio_driver doc
2017-05-09 16:43:22 +03:00
virtio: add context flag to find vqs
2017-05-02 23:41:43 +03:00
virtio: add context flag to find vqs
2017-05-02 23:41:43 +03:00
mm: move MADV_FREE pages into LRU_INACTIVE_FILE list
2017-05-03 15:52:08 -07:00
mm, vmalloc: fix vmalloc users tracking properly
2017-05-12 15:57:15 -07:00
