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* drivers: base: reduce add_memory_section() for boot-time onlySeth Jennings2013-08-212-28/+14
| | | | | | | | Now that add_memory_section() is only called from boot time, reduce the logic and remove the enum. Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: base: unshare add_memory_section() from hotplugSeth Jennings2013-08-211-3/+16
| | | | | | | | | | | | | | add_memory_section() is currently called from both boot time and run time via hotplug and there is a lot of nastiness to allow for shared code including an enum parameter to convey the calling context to add_memory_section(). This patch is the first step in breaking up the messy code sharing by pulling the hotplug path for add_memory_section() directly into register_new_memory(). Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: base: use device get/put functionsSeth Jennings2013-08-211-4/+4
| | | | | | | | | Use the [get|put]_device functions for ref'ing the memory block device rather than the kobject functions which should be hidden away by the device layer. Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: base: remove unneeded variableSeth Jennings2013-08-211-4/+1
| | | | | | | The error variable is not needed. Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers: base: move mutex lock out of add_memory_section()Seth Jennings2013-08-211-4/+9
| | | | | | | | There is no point in releasing the mutex for each section that is added during boot time. Just hold it over the entire initialization loop. Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* ACPI: bgrt: take advantage of binary sysfs groupsGreg KH2013-08-211-16/+10
| | | | | | | | | | | | | | | | | | Attribute groups now can handle binary sysfs attributes, so clean up the code here by using a binary attribute array. This saves us the extra call to create the binary attribute at saves 6 lines overall. Cc: Len Brown <lenb@kernel.org> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> -- I can take this in my driver-core tree if someone from ACPI acks it, otherwise, feel free to take it through the ACPI trees instead, just let me know. drivers/acpi/bgrt.c | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-)
* hid: roccat-pyra: convert class code to use bin_attrs in groupsGreg Kroah-Hartman2013-08-201-78/+62
| | | | | | | | | Now that attribute groups support binary attributes, use them instead of the dev_bin_attrs field in struct class, as that is going away soon. Cc: Jiri Kosina <jkosina@suse.cz> Cc: Stefan Achatz <erazor_de@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* sysfs.h: fix __BIN_ATTR_RW()Greg Kroah-Hartman2013-08-201-1/+1
| | | | | | | | | | __BIN_ATTR_RW() wasn't passing in the _size field. As it would break the build if this macro was ever used, it's obvious no one had ever tried to use it before. Fix it so that it can be used. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hid: roccat-kone: fix off-by-one bug in attributesGreg Kroah-Hartman2013-08-191-1/+1
| | | | | | | | | Stefan pointed out that I messed up the array for the binary attributes, so fix it properly. Reported-by: Stefan Achatz <erazor_de@users.sourceforge.net> Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hid: roccat-kovaplus: convert class code to use bin_attrs in groupsGreg Kroah-Hartman2013-08-191-83/+54
| | | | | | | | Now that attribute groups support binary attributes, use them instead of the dev_bin_attrs field in struct class, as that is going away soon. Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hid: roccat-konepure: convert class code to use bin_attrs in groupsGreg Kroah-Hartman2013-08-191-27/+40
| | | | | | | | Now that attribute groups support binary attributes, use them instead of the dev_bin_attrs field in struct class, as that is going away soon. Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hid: roccat-koneplus: convert class code to use bin_attrs in groupsGreg Kroah-Hartman2013-08-191-87/+66
| | | | | | | | Now that attribute groups support binary attributes, use them instead of the dev_bin_attrs field in struct class, as that is going away soon. Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hid: roccat-savu: convert class code to use bin_attrs in groupsGreg Kroah-Hartman2013-08-191-27/+31
| | | | | | | | Now that attribute groups support binary attributes, use them instead of the dev_bin_attrs field in struct class, as that is going away soon. Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hid: roccat-kone: convert class code to use bin_attrs in groupsGreg Kroah-Hartman2013-08-191-46/+34
| | | | | | | | Now that attribute groups support binary attributes, use them instead of the dev_bin_attrs field in struct class, as that is going away soon. Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hid: roccat-isku: convert class code to use bin_attrs in groupsGreg Kroah-Hartman2013-08-191-38/+49
| | | | | | | | Now that attribute groups support binary attributes, use them instead of the dev_bin_attrs field in struct class, as that is going away soon. Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* hid: roccat-arvo: convert class code to use bin_attrs in groupsGreg Kroah-Hartman2013-08-191-15/+19
| | | | | | | | Now that attribute groups support binary attributes, use them instead of the dev_bin_attrs field in struct class, as that is going away soon. Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* backing-dev: convert class code to use dev_groupsGreg Kroah-Hartman2013-08-191-8/+11
| | | | | | | | | | | The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the backing device class code to use the correct field. Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Jan Kara <jack@suse.cz> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* PPS: convert class code to use dev_groupsGreg Kroah-Hartman2013-08-193-22/+37
| | | | | | | | | The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the pps class code to use the correct field. Cc: Rodolfo Giometti <giometti@enneenne.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* x86: wmi: convert class code to use dev_groupsGreg Kroah-Hartman2013-08-191-4/+6
| | | | | | | | | The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the wmi class code to use the correct field. Cc: Matthew Garrett <matthew.garrett@nebula.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* v4l2: convert class code to use dev_groupsGreg Kroah-Hartman2013-08-191-13/+17
| | | | | | | | | | The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the v4l2 class code to use the correct field. Cc: Mauro Carvalho Chehab <mchehab@redhat.com> Cc: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* HID: roccat: convert class code to use dev_groupsGreg Kroah-Hartman2013-08-196-65/+88
| | | | | | | | | The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the roccat class code to use the correct field. Cc: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* devfreq: convert devfreq_class to use dev_groupsGreg Kroah-Hartman2013-08-191-34/+44
| | | | | | | | | | The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the devfreq_class code to use the correct field. Cc: MyungJoo Ham <myungjoo.ham@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* mips: convert vpe_class to use dev_groupsGreg Kroah-Hartman2013-08-191-7/+10
| | | | | | | | | | The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the MIPS vpe_class code to use the correct field. Cc: Ralf Baechle <ralf@linux-mips.org> Cc: John Crispin <blogic@openwrt.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers / dma-contiguous: Fix __init attribute locationHanjun Guo2013-08-191-2/+2
| | | | | | | __init belongs after the return type on functions, not before it. Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers / platform: Fix __init attribute locationHanjun Guo2013-08-191-2/+2
| | | | | | | __init belongs after the return type on functions, not before it. Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* drivers / base: Fix sysfs_deprecated_setup() __init attribute locationHanjun Guo2013-08-191-1/+1
| | | | | | | __init belongs after the return type on functions, not before it. Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* driver core / cpu: Check if NUMA node is valid before bringing CPU upRafael J. Wysocki2013-08-121-1/+5
| | | | | | | | | | | | | | There is a potential race condition between cpu_subsys_online() and either acpi_processor_remove() or remove_memory() that execute try_offline_node(). Namely, it is possible that cpu_subsys_online() will run right after the CPUs NUMA node has been put offline and cpu_to_node() executed by it will return NUMA_NO_NODE (-1). In that case the CPU is gone and it doesn't make sense to call cpu_up() for it, so make cpu_subsys_online() return -ENODEV then. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Correct unfaithful translation on HOWTO in ko_KRLee, Jae-Hong2013-08-121-2/+2
| | | | | | | | This patch corrects unfaithful Korean translation in Documentation/ko_KR/HOWTO. Signed-off-by: Lee, Jae-Hong <pyrasis@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Type fix on stable_api_nonsense.txtLee, Jae-Hong2013-08-121-3/+3
| | | | | | | | This patch fixes some minor typos in Documentation/ko_KR/stable_api_nonsense.txt Signed-off-by: Lee, Jae-Hong <pyrasis@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Type fix on HOWTO in ko_KRLee, Jae-Hong2013-08-121-10/+11
| | | | | | | | This patch fixes some minor typos in Documentation/ko_KR/HOWTO. Signed-off-by: Lee, Jae-Hong <pyrasis@gmail.com> Acked-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* driver core: bus_type: add bus_groupsGreg Kroah-Hartman2013-08-122-1/+40
| | | | | | | | | | | attribute groups are much more flexible than just a list of attributes, due to their support for visibility of the attributes, and binary attributes. Add bus_groups to struct bus_type which should be used instead of bus_attrs. bus_attrs will be removed from the structure soon. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* driver core: bus_type: add drv_groupsGreg Kroah-Hartman2013-08-124-5/+17
| | | | | | | | | | | attribute groups are much more flexible than just a list of attributes, due to their support for visibility of the attributes, and binary attributes. Add drv_groups to struct bus_type which should be used instead of drv_attrs. drv_attrs will be removed from the structure soon. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* driver core: bus_type: add dev_groupsGreg Kroah-Hartman2013-08-124-5/+17
| | | | | | | | | | | attribute groups are much more flexible than just a list of attributes, due to their support for visibility of the attributes, and binary attributes. Add dev_groups to struct bus_type which should be used instead of dev_attrs. dev_attrs will be removed from the structure soon. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* tile / cpu topology: remove stale Macro arch_provides_topology_pointersHanjun Guo2013-07-291-3/+0
| | | | | | | | Macro arch_provides_topology_pointers is pointless now, remove it. Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Cc: Chris Metcalf <cmetcalf@tilera.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* x86 / cpu topology: remove the stale macro arch_provides_topology_pointersHanjun Guo2013-07-291-3/+0
| | | | | | | | Macro arch_provides_topology_pointers is pointless now, remove it. Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* cpu topology: remove stale arch_provides_topology_pointers and ↵Hanjun Guo2013-07-291-20/+0
| | | | | | | | | | | | | | | | | | | | | | | | | define_siblings_show_map/list() arch_provides_topology_pointers was introduced in commit 23ca4bba3 (x86: cleanup early per cpu variables/accesses v4) to indicate pointers to the topology cpumask_t maps are valid to avoid copying data on to/off of the stack. But later in commit fbd59a8d (cpumask: Use topology_core_cpumask()/ topology_thread_cpumask()), the pointers to the topology struct cpumask maps are always valid. After that commit, the only difference is that there is a redundant "unsigned int cpu = dev->id;" if arch_provides_topology_pointers defined, but dev->id is type 'u32' which devolves to 'unsigned int' on all supported arches. So this arch_provides_topology_pointers define is pointless and only cause obfuscation now, remove it. Tested on x86 machine, topology information in sys/devices/system/cpu/ cpuX/topology/ is the same after appling this patch set. Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* rtc: convert class code to use dev_groupsGreg Kroah-Hartman2013-07-291-24/+24
| | | | | | | | | The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the rtc class code to use the correct field. Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* Merge 3.11-rc3 into driver-core-nextGreg Kroah-Hartman2013-07-29339-4754/+6882
|\ | | | | | | | | | | We want these fixes in this branch. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| * Linux 3.11-rc3v3.11-rc3Linus Torvalds2013-07-281-1/+1
| |
| * Merge tag 'pinctrl-for-v3.11-2' of ↵Linus Torvalds2013-07-287-19/+49
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control fixes from Linus Walleij: - Driver fixes for AM33xx, SIRF and PFC pin controllers - Fix a compile warning from the pinctrl single-register driver - Fix a little nasty memory leak * tag 'pinctrl-for-v3.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: pinctrl: fix a memleak when freeing maps pinctrl: pinctrl-single: fix compile warning when no CONFIG_PM pinctrl: sh-pfc: fix SDHI0 VccQ regulator on sh73a0 with DT arm/dts: sirf: fix the pingroup name mismatch between drivers and dts pinctrl: sirf: add usp0_uart_nostreamctrl pin group for usp-uart without flowctrl pinctrl: sirf: fix the pin number and mux bit for usp0 pinctrl: am33xx dt binding: correct include path
| | * pinctrl: fix a memleak when freeing mapsLinus Walleij2013-07-251-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | We forgot to free the node itself when free:ing a map. Reported-by: xulinuxkernel <xulinuxkernel@gmail.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * pinctrl: pinctrl-single: fix compile warning when no CONFIG_PMJean-Francois Moine2013-07-221-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | This warning has been introduced by the commit 0f9bc4bcdf4f pinctrl: single: adopt pinctrl sleep mode management Signed-off-by: Jean-Francois Moine <moinejf@free.fr> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * pinctrl: sh-pfc: fix SDHI0 VccQ regulator on sh73a0 with DTGuennadi Liakhovetski2013-07-221-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The PFC pinctrl driver on sh73a0 is also regiatering a VccQ regulator for SDHI0. However, its consumers list only included the platform-data based SDHI device name. When booted with DT SDHI0 couldn't enable VccQ and therefore was unusable. Fix this by adding a consumer with DT-based name. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Acked-by: Simon Horman <horms+renesas@verge.net.au> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * arm/dts: sirf: fix the pingroup name mismatch between drivers and dtsBarry Song2013-07-222-16/+16
| | | | | | | | | | | | | | | | | | | | | | | | in drivers/pinctrl/sirf, pingroup name is cko0 and cko1, but in dts, they are cko0 and cko1_rst. this patch fixes the error in dts. Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * pinctrl: sirf: add usp0_uart_nostreamctrl pin group for usp-uart without ↵Qipan Li2013-07-222-0/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | flowctrl this patch adds the lost pin group which supports to let USP0 to simulate a UART without hardware flow control. Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * pinctrl: sirf: fix the pin number and mux bit for usp0Qipan Li2013-07-221-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | we missed a pin and related mux bit for usp pin group, this patch fixes it. Signed-off-by: Qipan Li <Qipan.Li@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| | * pinctrl: am33xx dt binding: correct include pathIan Campbell2013-07-211-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Using #include <include/...> is a bit odd. It happens to work because the DTC flags include -Iarch/FOO/boot/dts as well as arch/FOO/boot/dts/include and arch/FOO/boot/dts/include/dt-bindings is a symlink to include/dt-bindings. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| * | Merge tag 'trace-fixes-3.11-rc2' of ↵Linus Torvalds2013-07-283-128/+95
| |\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fixes from Steven Rostedt: "Oleg is working on fixing a very tight race between opening a event file and deleting that event at the same time (both must be done as root). I also found a bug while testing Oleg's patches which has to do with a race with kprobes using the function tracer. There's also a deadlock fix that was introduced with the previous fixes" * tag 'trace-fixes-3.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Remove locking trace_types_lock from tracing_reset_all_online_cpus() ftrace: Add check for NULL regs if ops has SAVE_REGS set tracing: Kill trace_cpu struct/members tracing: Change tracing_fops/snapshot_fops to rely on tracing_get_cpu() tracing: Change tracing_entries_fops to rely on tracing_get_cpu() tracing: Change tracing_stats_fops to rely on tracing_get_cpu() tracing: Change tracing_buffers_fops to rely on tracing_get_cpu() tracing: Change tracing_pipe_fops() to rely on tracing_get_cpu() tracing: Introduce trace_create_cpu_file() and tracing_get_cpu()
| | * | tracing: Remove locking trace_types_lock from tracing_reset_all_online_cpus()Steven Rostedt (Red Hat)2013-07-261-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit a82274151af "tracing: Protect ftrace_trace_arrays list in trace_events.c" added taking the trace_types_lock mutex in trace_events.c as there were several locations that needed it for protection. Unfortunately, it also encapsulated a call to tracing_reset_all_online_cpus() which also takes the trace_types_lock, causing a deadlock. This happens when a module has tracepoints and has been traced. When the module is removed, the trace events module notifier will grab the trace_types_lock, do a bunch of clean ups, and also clears the buffer by calling tracing_reset_all_online_cpus. This doesn't happen often which explains why it wasn't caught right away. Commit a82274151af was marked for stable, which means this must be sent to stable too. Link: http://lkml.kernel.org/r/51EEC646.7070306@broadcom.com Reported-by: Arend van Spril <arend@broadcom.com> Tested-by: Arend van Spriel <arend@broadcom.com> Cc: Alexander Z Lam <azl@google.com> Cc: Vaibhav Nagarnaik <vnagarnaik@google.com> Cc: David Sharp <dhsharp@google.com> Cc: stable@vger.kernel.org # 3.10 Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| | * | ftrace: Add check for NULL regs if ops has SAVE_REGS setSteven Rostedt (Red Hat)2013-07-241-4/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | If a ftrace ops is registered with the SAVE_REGS flag set, and there's already a ops registered to one of its functions but without the SAVE_REGS flag, there's a small race window where the SAVE_REGS ops gets added to the list of callbacks to call for that function before the callback trampoline gets set to save the regs. The problem is, the function is not currently saving regs, which opens a small race window where the ops that is expecting regs to be passed to it, wont. This can cause a crash if the callback were to reference the regs, as the SAVE_REGS guarantees that regs will be set. To fix this, we add a check in the loop case where it checks if the ops has the SAVE_REGS flag set, and if so, it will ignore it if regs is not set. Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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