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    Subject[PATCH 20/93] ACPI / cpuidle: Fix NULL pointer issues when cpuidle is disabled
    Date
    3.5.7.5 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

    commit b88a634a903d9670aa5f2f785aa890628ce0dece upstream.

    If cpuidle is disabled, that means that:

    per_cpu(acpi_cpuidle_device, pr->id)

    is set to NULL as the acpi_processor_power_init ends up failing at

    retval = cpuidle_register_driver(&acpi_idle_driver)

    (in acpi_processor_power_init) and never sets the per_cpu idle
    device. So when acpi_processor_hotplug on CPU online notification
    tries to reference said device it crashes:

    cpu 3 spinlock event irq 62
    BUG: unable to handle kernel NULL pointer dereference at 0000000000000004
    IP: [<ffffffff81381013>] acpi_processor_setup_cpuidle_cx+0x3f/0x105
    PGD a259b067 PUD ab38b067 PMD 0
    Oops: 0002 [#1] SMP
    odules linked in: dm_multipath dm_mod xen_evtchn iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi libcrc32c crc32c nouveau mxm_wmi wmi radeon ttm sg sr_mod sd_mod cdrom ata_generic ata_piix libata crc32c_intel scsi_mod atl1c i915 fbcon tileblit font bitblit softcursor drm_kms_helper video xen_blkfront xen_netfront fb_sys_fops sysimgblt sysfillrect syscopyarea xenfs xen_privcmd mperf
    CPU 1
    Pid: 3047, comm: bash Not tainted 3.8.0-rc3upstream-00250-g165c029 #1 MSI MS-7680/H61M-P23 (MS-7680)
    RIP: e030:[<ffffffff81381013>] [<ffffffff81381013>] acpi_processor_setup_cpuidle_cx+0x3f/0x105
    RSP: e02b:ffff88001742dca8 EFLAGS: 00010202
    RAX: 0000000000010be9 RBX: ffff8800a0a61800 RCX: ffff880105380000
    RDX: 0000000000000003 RSI: 0000000000000200 RDI: ffff8800a0a61800
    RBP: ffff88001742dce8 R08: ffffffff81812360 R09: 0000000000000200
    R10: aaaaaaaaaaaaaaaa R11: 0000000000000001 R12: ffff8800a0a61800
    R13: 00000000ffffff01 R14: 0000000000000000 R15: ffffffff81a907a0
    FS: 00007fd6942f7700(0000) GS:ffff880105280000(0000) knlGS:0000000000000000
    CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000004 CR3: 00000000a6773000 CR4: 0000000000042660
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process bash (pid: 3047, threadinfo ffff88001742c000, task ffff880017944000)
    Stack:
    0000000000000150 ffff880100f59e00 ffff88001742dcd8 ffff8800a0a61800
    0000000000000000 00000000ffffff01 0000000000000000 ffffffff81a907a0
    ffff88001742dd18 ffffffff813815b1 ffff88001742dd08 ffffffff810ae336
    Call Trace:
    [<ffffffff813815b1>] acpi_processor_hotplug+0x7c/0x9f
    [<ffffffff810ae336>] ? schedule_delayed_work_on+0x16/0x20
    [<ffffffff8137ee8f>] acpi_cpu_soft_notify+0x90/0xca
    [<ffffffff8166023d>] notifier_call_chain+0x4d/0x70
    [<ffffffff810bc369>] __raw_notifier_call_chain+0x9/0x10
    [<ffffffff81094a4b>] __cpu_notify+0x1b/0x30
    [<ffffffff81652cf7>] _cpu_up+0x103/0x14b
    [<ffffffff81652e18>] cpu_up+0xd9/0xec
    [<ffffffff8164a254>] store_online+0x94/0xd0
    [<ffffffff814122fb>] dev_attr_store+0x1b/0x20
    [<ffffffff81216404>] sysfs_write_file+0xf4/0x170

    This patch fixes it.

    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
    ---
    drivers/acpi/processor_idle.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
    index 47a8caa..4a33518 100644
    --- a/drivers/acpi/processor_idle.c
    +++ b/drivers/acpi/processor_idle.c
    @@ -1046,6 +1046,9 @@ static int acpi_processor_setup_cpuidle_cx(struct acpi_processor *pr)
    return -EINVAL;
    }

    + if (!dev)
    + return -EINVAL;
    +
    dev->cpu = pr->id;

    if (max_cstate == 0)
    --
    1.7.9.5


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