1. 03 Jun, 2017 1 commit
    • Sascha Hauer's avatar
      tty: n_gsm: do not send/receive in ldisc close path · 71e07791
      Sascha Hauer authored
      gsm_cleanup_mux() is called in the line discipline close path which
      is called at tty_release() time. At this stage the tty is no longer
      operational enough to send any frames. Sending close frames is
      therefore not possible and waiting for their answers always times
      out.
      
      This patch removes sending close messages and waiting for their answers
      from the tty_release path.
      
      This patch makes explicit what previously implicitly had been the case
      already: We are not able to tell the modem that we are about to close
      the multiplexer on our side. This means the modem will stay in
      multiplexer mode and re-establishing the multiplexer later fails. The
      only way for userspace to work around this is to manually send a close
      frame in N_TTY mode after closing the mux.
      Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      71e07791
  2. 18 Aug, 2016 1 commit
  3. 14 May, 2016 2 commits
  4. 01 May, 2016 1 commit
  5. 16 Apr, 2016 1 commit
  6. 15 Apr, 2016 3 commits
  7. 31 Mar, 2016 9 commits
  8. 27 Jan, 2016 1 commit
  9. 05 Oct, 2015 1 commit
  10. 04 Oct, 2015 1 commit
  11. 13 Jun, 2015 2 commits
  12. 10 May, 2015 1 commit
    • Peter Hurley's avatar
      pty: Fix input race when closing · 1a48632f
      Peter Hurley authored
      A read() from a pty master may mistakenly indicate EOF (errno == -EIO)
      after the pty slave has closed, even though input data remains to be read.
      For example,
      
             pty slave       |        input worker        |    pty master
                             |                            |
                             |                            |   n_tty_read()
      pty_write()            |                            |     input avail? no
        add data             |                            |     sleep
        schedule worker  --->|                            |     .
                             |---> flush_to_ldisc()       |     .
      pty_close()            |       fill read buffer     |     .
        wait for worker      |       wakeup reader    --->|     .
                             |       read buffer full?    |---> input avail ? yes
                             |<---   yes - exit worker    |     copy 4096 bytes to user
        TTY_OTHER_CLOSED <---|                            |<--- kick worker
                             |                            |
      
      		                **** New read() before worker starts ****
      
                             |                            |   n_tty_read()
                             |                            |     input avail? no
                             |                            |     TTY_OTHER_CLOSED? yes
                             |                            |     return -EIO
      
      Several conditions are required to trigger this race:
      1. the ldisc read buffer must become full so the input worker exits
      2. the read() count parameter must be >= 4096 so the ldisc read buffer
         is empty
      3. the subsequent read() occurs before the kicked worker has processed
         more input
      
      However, the underlying cause of the race is that data is pipelined, while
      tty state is not; ie., data already written by the pty slave end is not
      yet visible to the pty master end, but state changes by the pty slave end
      are visible to the pty master end immediately.
      
      Pipeline the TTY_OTHER_CLOSED state through input worker to the reader.
      1. Introduce TTY_OTHER_DONE which is set by the input worker when
         TTY_OTHER_CLOSED is set and either the input buffers are flushed or
         input processing has completed. Readers/polls are woken when
         TTY_OTHER_DONE is set.
      2. Reader/poll checks TTY_OTHER_DONE instead of TTY_OTHER_CLOSED.
      3. A new input worker is started from pty_close() after setting
         TTY_OTHER_CLOSED, which ensures the TTY_OTHER_DONE state will be
         set if the last input worker is already finished (or just about to
         exit).
      
      Remove tty_flush_to_ldisc(); no in-tree callers.
      
      Fixes: 52bce7f8 ("pty, n_tty: Simplify input processing on final close")
      Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=96311
      BugLink: http://bugs.launchpad.net/bugs/1429756
      Cc: <stable@vger.kernel.org> # 3.19+
      Reported-by: default avatarAndy Whitcroft <apw@canonical.com>
      Reported-by: default avatarH.J. Lu <hjl.tools@gmail.com>
      Signed-off-by: default avatarPeter Hurley <peter@hurleysoftware.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      1a48632f
  13. 06 Nov, 2014 1 commit
    • Peter Hurley's avatar
      serial: Fix locking for uart driver set_termios() method · 7c8ab967
      Peter Hurley authored
      The low-level uart driver may modify termios settings to override
      settings that are not compatible with the uart, such as CRTSCTS.
      Thus, callers of the low-level uart driver's set_termios() method must
      hold termios_rwsem write lock to prevent concurrent access to termios,
      in case such override occurs.
      
      The termios_rwsem lock requirement does not extend to console setup
      (ie., uart_set_options), as console setup cannot race with tty
      operations. Nor does this lock requirement extend to functions which
      cannot be concurrent with tty ioctls (ie., uart_port_startup() and
      uart_resume_port()).
      
      Further, always claim the port mutex to protect hardware
      re-reprogramming in the set_termios() uart driver method. Note this
      is unnecessary for console initialization in uart_set_options()
      which cannot be concurrent with other uart operations.
      Signed-off-by: default avatarPeter Hurley <peter@hurleysoftware.com>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      7c8ab967
  14. 08 Sep, 2014 2 commits
  15. 04 Sep, 2014 1 commit
  16. 26 Aug, 2014 1 commit
  17. 28 May, 2014 1 commit
  18. 16 Apr, 2014 1 commit
  19. 11 Feb, 2014 1 commit
    • Henrik Austad's avatar
      Documentation/: update 00-INDEX files · 3cf8ca1c
      Henrik Austad authored
      Some of the 00-INDEX files are somewhat outdated and some folders does
      not contain 00-INDEX at all.  Only outdated (with the notably exception
      of spi) indexes are touched here, the 169 folders without 00-INDEX has
      not been touched.
      
      New 00-INDEX
       - spi/* was added in a series of commits dating back to 2006
      
      Added files (missing in (*/)00-INDEX)
       - dmatest.txt was added by commit 851b7e16 ("dmatest: run test via
         debugfs")
       - this_cpu_ops.txt was added by commit a1b2a555 ("percpu: add
         documentation on this_cpu operations")
       - ww-mutex-design.txt was added by commit 040a0a37 ("mutex: Add
         support for wound/wait style locks")
       - bcache.txt was added by commit cafe5635 ("bcache: A block layer
         cache")
       - kernel-per-CPU-kthreads.txt was added by commit 49717cb4
         ("kthread: Document ways of reducing OS jitter due to per-CPU
         kthreads")
       - phy.txt was added by commit ff764963 ("drivers: phy: add generic
         PHY framework")
       - block/null_blk was added by commit 12f8f4fc ("null_blk:
         documentation")
       - module-signing.txt was added by commit 3cafea30 ("Add
         Documentation/module-signing.txt file")
       - assoc_array.txt was added by commit 3cb98950 ("Add a generic
         associative array implementation.")
       - arm/IXP4xx was part of the initial repo
       - arm/cluster-pm-race-avoidance.txt was added by commit 7fe31d28
         ("ARM: mcpm: introduce helpers for platform coherency exit/setup")
       - arm/firmware.txt was added by commit 7366b92a ("ARM: Add
         interface for registering and calling firmware-specific operations")
       - arm/kernel_mode_neon.txt was added by commit 2afd0a05 ("ARM:
         7825/1: document the use of NEON in kernel mode")
       - arm/tcm.txt was added by commit bc581770 ("ARM: 5580/2: ARM TCM
         (Tightly-Coupled Memory) support v3")
       - arm/vlocks.txt was added by commit 9762f12d ("ARM: mcpm: Add
         baremetal voting mutexes")
       - blackfin/gptimers-example.c, Makefile was added by commit
         4b60779d ("Blackfin: add an example showing how to use the
         gptimers API")
       - devicetree/usage-model.txt was added by commit 31134efc ("dt:
         Linux DT usage model documentation")
       - fb/api.txt was added by commit fb21c2f4 ("fbdev: Add FOURCC-based
         format configuration API")
       - fb/sm501.txt was added by commit e6a04980 ("video, sm501: add
         edid and commandline support")
       - fb/udlfb.txt was added by commit 96f8d864 ("fbdev: move udlfb out
         of staging.")
       - filesystems/Makefile was added by commit 1e0051ae
         ("Documentation/fs/: split txt and source files")
       - filesystems/nfs/nfsd-admin-interfaces.txt was added by commit
         8a4c6e19 ("nfsd: document kernel interfaces for nfsd
         configuration")
       - ide/warm-plug-howto.txt was added by commit f74c9141 ("ide: add
         warm-plug support for IDE devices (take 2)")
       - laptops/Makefile was added by commit d49129ac
         ("Documentation/laptop/: split txt and source files")
       - leds/leds-blinkm.txt was added by commit b54cf35a ("LEDS: add
         BlinkM RGB LED driver, documentation and update MAINTAINERS")
       - leds/ledtrig-oneshot.txt was added by commit 5e417281 ("leds: add
         oneshot trigger")
       - leds/ledtrig-transient.txt was added by commit 44e1e9f8 ("leds:
         add new transient trigger for one shot timer activation")
       - m68k/README.buddha was part of the initial repo
       - networking/LICENSE.(qla3xxx|qlcnic|qlge) was added by commits
         40839129, c4e84bde, 5a4faa87
       - networking/Makefile was added by commit 3794f3e8 ("docsrc: build
         Documentation/ sources")
       - networking/i40evf.txt was added by commit 105bf2fe ("i40evf: add
         driver to kernel build system")
       - networking/ipsec.txt was added by commit b3c6efbc ("xfrm: Add
         file to document IPsec corner case")
       - networking/mac80211-auth-assoc-deauth.txt was added by commit
         3cd7920a ("mac80211: add auth/assoc/deauth flow diagram")
       - networking/netlink_mmap.txt was added by commit 5683264c
         ("netlink: add documentation for memory mapped I/O")
       - networking/nf_conntrack-sysctl.txt was added by commit c9f9e0e1
         ("netfilter: doc: add nf_conntrack sysctl api documentation") lan)
       - networking/team.txt was added by commit 3d249d4c ("net: introduce
         ethernet teaming device")
       - networking/vxlan.txt was added by commit d342894c ("vxlan:
         virtual extensible lan")
       - power/runtime_pm.txt was added by commit 5e928f77 ("PM: Introduce
         core framework for run-time PM of I/O devices (rev.  17)")
       - power/charger-manager.txt was added by commit 3bb3dbbd
         ("power_supply: Add initial Charger-Manager driver")
       - RCU/lockdep-splat.txt was added by commit d7bd2d68 ("rcu:
         Document interpretation of RCU-lockdep splats")
       - s390/kvm.txt was added by 5ecee4ba (KVM: s390: API documentation)
       - s390/qeth.txt was added by commit b4d72c08 ("qeth: bridgeport
         support - basic control")
       - scheduler/sched-bwc.txt was added by commit 88ebc08e ("sched: Add
         documentation for bandwidth control")
       - scsi/advansys.txt was added by commit 4bd6d7f3 ("[SCSI] advansys:
         Move documentation to Documentation/scsi")
       - scsi/bfa.txt was added by commit 1ec90174 ("[SCSI] bfa: add
         readme file")
       - scsi/bnx2fc.txt was added by commit 12b8fc10 ("[SCSI] bnx2fc: Add
         driver documentation")
       - scsi/cxgb3i.txt was added by commit c3673464 ("[SCSI] cxgb3i: Add
         cxgb3i iSCSI driver.")
       - scsi/hpsa.txt was added by commit 992ebcf1 ("[SCSI] hpsa: Add
         hpsa.txt to Documentation/scsi")
       - scsi/link_power_management_policy.txt was added by commit
         ca77329f ("[libata] Link power management infrastructure")
       - scsi/osd.txt was added by commit 78e0c621 ("[SCSI] osd:
         Documentation for OSD library")
       - scsi/scsi-parameter.txt was created/moved by commit 163475fb
         ("Documentation: move SCSI parameters to their own text file")
       - serial/driver was part of the initial repo
       - serial/n_gsm.txt was added by commit 323e8412 ("n_gsm: add a
         documentation")
       - timers/Makefile was added by commit 3794f3e8 ("docsrc: build
         Documentation/ sources")
       - virt/kvm/s390.txt was added by commit d9101fca ("KVM: s390:
         diagnose call documentation")
       - vm/split_page_table_lock was added by commit 49076ec2 ("mm:
         dynamically allocate page->ptl if it cannot be embedded to struct
         page")
       - w1/slaves/w1_ds28e04 was added by commit fbf7f7b4 ("w1: Add
         1-wire slave device driver for DS28E04-100")
       - w1/masters/omap-hdq was added by commit e0a29382 ("hdq:
         documentation for OMAP HDQ")
       - x86/early-microcode.txt was added by commit 0d91ea86 ("x86, doc:
         Documentation for early microcode loading")
       - x86/earlyprintk.txt was added by commit a1aade47 ("x86/doc:
         mini-howto for using earlyprintk=dbgp")
       - x86/entry_64.txt was added by commit 8b4777a4 ("x86-64: Document
         some of entry_64.S")
       - x86/pat.txt was added by commit d27554d8 ("x86: PAT
         documentation")
      
      Moved files
       - arm/kernel_user_helpers.txt was moved out of arch/arm/kernel by
         commit 37b83046 ("ARM: kuser: move interface documentation out of
         the source code")
       - efi-stub.txt was moved out of x86/ and down into Documentation/ in
         commit 4172fe2f ("EFI stub documentation updates")
       - laptops/hpfall.c was moved out of hwmon/ and into laptops/ in commit
         efcfed9b ("Move hp_accel to drivers/platform/x86")
       - commit 5616c23a ("x86: doc: move x86-generic documentation from
         Doc/x86/i386"):
         * x86/usb-legacy-support.txt
         * x86/boot.txt
         * x86/zero_page.txt
       - power/video_extension.txt was moved to acpi in commit 70e66e4d
         ("ACPI / video: move video_extension.txt to Documentation/acpi")
      
      Removed files (left in 00-INDEX)
       - memory.txt was removed by commit 00ea8990 ("memory.txt: remove
         stray information")
       - gpio.txt was moved to gpio/ in commit fd8e198c ("Documentation:
         gpiolib: document new interface")
       - networking/DLINK.txt was removed by commit 168e06ae
         ("drivers/net: delete old parallel port de600/de620 drivers")
       - serial/hayes-esp.txt was removed by commit f53a2ade ("tty: esp:
         remove broken driver")
       - s390/TAPE was removed by commit 9e280f66 ("[S390] remove tape
         block docu")
       - vm/locking was removed by commit 57ea8171 ("mm: documentation:
         remove hopelessly out-of-date locking doc")
       - laptops/acer-wmi.txt was remvoed by commit 02003667 ("acer-wmi:
         Delete out-of-date documentation")
      
      Typos/misc issues
       - rpc-server-gss.txt was added as knfsd-rpcgss.txt in commit
         030d794b ("SUNRPC: Use gssproxy upcall for server RPCGSS
         authentication.")
       - commit b88cf73d ("net: add missing entries to
         Documentation/networking/00-INDEX")
         * generic-hdlc.txt was added as generic_hdlc.txt
         * spider_net.txt was added as spider-net.txt
       - w1/master/mxc-w1 was added as mxc_w1 by commit a5fd9139 ("w1: add
         1-wire master driver for i.MX27 / i.MX31")
       - s390/zfcpdump.txt was added as zfcpdump by commit 6920c12a
         ("[S390] Add Documentation/s390/00-INDEX.")
      Signed-off-by: default avatarHenrik Austad <henrik@austad.us>
      Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>	[rcu bits]
      Acked-by: default avatarRob Landley <rob@landley.net>
      Cc: Jiri Kosina <jkosina@suse.cz>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Rob Herring <robh+dt@kernel.org>
      Cc: David S. Miller <davem@davemloft.net>
      Cc: Mark Brown <broonie@kernel.org>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Gleb Natapov <gleb@kernel.org>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Len Brown <len.brown@intel.com>
      Cc: James Bottomley <JBottomley@parallels.com>
      Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3cf8ca1c
  20. 16 Oct, 2013 1 commit
    • Linus Walleij's avatar
      serial: core: delete .set_wake() callback · fa2b5ea0
      Linus Walleij authored
      This deletes the .set_wake() callback in the struct uart_ops.
      Apparently this has been unused since pre-git times. In the
      old-2.6-bkcvs it is deleted as part of a changeset removing
      the PM_SET_WAKEUP from pm_request_t which is since also deleted
      from the kernel.
      
      The apropriate way to set wakeups in the kernel is to have a
      code snippet like this in .suspend() or .runtime_suspend()
      callbacks:
      
      static int foo_suspend(struct device *dev)
      {
      	if (device_may_wakeup(dev)) {
      		/* Enable wakeups, set internal states */
      	}
      }
      
      This specific callback is not coming back.
      
      Cc: Rafael J. Wysocki <rjw@sisk.pl>
      Cc: Len Brown <len.brown@intel.com>
      Cc: Pavel Machek <pavel@ucw.cz>
      Cc: Kevin Hilman <khilman@deeprootsystems.com>
      Cc: Dmitry Artamonow <mad_soft@inbox.ru>
      Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      fa2b5ea0
  21. 03 Jun, 2013 1 commit
  22. 16 Jan, 2013 2 commits
  23. 16 Aug, 2012 1 commit
  24. 17 May, 2012 1 commit
  25. 30 Mar, 2012 1 commit
  26. 05 Jan, 2012 1 commit