• Vaidyanathan Srinivasan's avatar
    cpuidle: Validate cpu_dev in cpuidle_add_sysfs() · ad0a45fd
    Vaidyanathan Srinivasan authored
    If a given cpu is not in cpu_present and cpu hotplug
    is disabled, arch can skip setting up the cpu_dev.
    
    Arch cpuidle driver should pass correct cpu mask
    for registration, but failing to do so by the driver
    causes error to propagate and crash like this:
    
    [   30.076045] Unable to handle kernel paging request for data at address 0x00000048
    [   30.076100] Faulting instruction address: 0xc0000000007b2f30
    cpu 0x4d: Vector: 300 (Data Access) at [c000003feb18b670]
        pc: c0000000007b2f30: kobject_get+0x20/0x70
        lr: c0000000007b3c94: kobject_add_internal+0x54/0x3f0
        sp: c000003feb18b8f0
       msr: 9000000000009033
       dar: 48
     dsisr: 40000000
      current = 0xc000003fd2ed8300
      paca    = 0xc00000000fbab500   softe: 0        irq_happened: 0x01
        pid   = 1, comm = swapper/0
    Linux version 4.11.0-rc2-svaidy+ (sv@sagarika) (gcc version 6.2.0
    20161005 (Ubuntu 6.2.0-5ubuntu12) ) #10 SMP Sun Mar 19 00:08:09 IST 2017
    enter ? for help
    [c000003feb18b960] c0000000007b3c94 kobject_add_internal+0x54/0x3f0
    [c000003feb18b9f0] c0000000007b43a4 kobject_init_and_add+0x64/0xa0
    [c000003feb18ba70] c000000000e284f4 cpuidle_add_sysfs+0xb4/0x130
    [c000003feb18baf0] c000000000e26038 cpuidle_register_device+0x118/0x1c0
    [c000003feb18bb30] c000000000e26c48 cpuidle_register+0x78/0x120
    [c000003feb18bbc0] c00000000168fd9c powernv_processor_idle_init+0x110/0x1c4
    [c000003feb18bc40] c00000000000cff8 do_one_initcall+0x68/0x1d0
    [c000003feb18bd00] c0000000016242f4 kernel_init_freeable+0x280/0x360
    [c000003feb18bdc0] c00000000000d864 kernel_init+0x24/0x160
    [c000003feb18be30] c00000000000b4e8 ret_from_kernel_thread+0x5c/0x74
    
    Validating cpu_dev fixes the crash and reports correct error message like:
    
    [   30.163506] Failed to register cpuidle device for cpu136
    [   30.173329] Registration of powernv driver failed.
    Signed-off-by: default avatarVaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
    [ rjw: Comment massage ]
    Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
    ad0a45fd
sysfs.c 16.5 KB