On Sat, Jun 3, 2017 at 8:21 PM, <priyalee.kushwaha@xxxxxxxxx> wrote:
> From: Priyalee Kushwaha <priyalee.kushwaha@xxxxxxxxx>
>
> This fix oops found while testing load/unload test of
> intel_telemetry_debugfs module. Module_init uses register_pm_notifier
> for PM callbacks, but unregister_pm_notifier was missing from
> module_exit.
>
> [ 97.481860] BUG: unable to handle kernel paging request at ffffffffa006f010
> [ 97.489742] IP: blocking_notifier_chain_register+0x3a/0xa0
> [ 97.495898] PGD 2e0a067
> [ 97.495899] PUD 2e0b063
> [ 97.498737] PMD 179e29067
> [ 97.501573] PTE 0
>
> [ 97.508423] Oops: 0000 1 PREEMPT SMP
> [ 97.512724] Modules linked in: intel_telemetry_debugfs intel_rapl gpio_keys dwc3 udc_core intel_telemetry_pltdrv intel_punit_ipc intel_telemetry_core rtc_cmos efivars x86_pkg_temp_thermal iwlwifi snd_hda_codec_hdmi soc_button_array btusb cfg80211 btrtl mei_me hci_uart btbcm mei btintel i915 bluetooth intel_pmc_ipc snd_hda_intel spi_pxa2xx_platform snd_hda_codec dwc3_pci snd_hda_core tpm_tis tpm_tis_core tpm efivarfs
> [ 97.558453] CPU: 0 PID: 889 Comm: modprobe Not tainted 4.11.0-rc6-intel-dev-bkc #1
> [ 97.566950] Hardware name: Intel Corp. Joule DVT3/SDS, BIOS GTPP181A.X64.0143.B30.1701132137 01/13/2017
> [ 97.577518] task: ffff8801793a21c0 task.stack: ffff8801793f0000
> [ 97.584162] RIP: 0010:blocking_notifier_chain_register+0x3a/0xa0
> [ 97.590903] RSP: 0018:ffff8801793f3c58 EFLAGS: 00010286
> [ 97.596802] RAX: ffffffffa006f000 RBX: ffffffff81e3ea20 RCX: 0000000000000000
> [ 97.604812] RDX: ffff880179eaf210 RSI: ffffffffa0131000 RDI: ffffffff81e3ea20
> [ 97.612821] RBP: ffff8801793f3c68 R08: 0000000000000006 R09: 000000000000005c
> [ 97.620847] R10: 0000000000000000 R11: 0000000000000006 R12: ffffffffa0131000
> [ 97.628855] R13: 0000000000000000 R14: ffff880176e35f48 R15: ffff8801793f3ea8
> [ 97.636865] FS: 00007f7eeba07700(0000) GS:ffff88017fc00000(0000) knlGS:0000000000000000
> [ 97.645948] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 97.652423] CR2: ffffffffa006f010 CR3: 00000001775ef000 CR4: 00000000003406f0
> [ 97.660423] Call Trace:
> [ 97.663166] ? 0xffffffffa0031000
> [ 97.666885] register_pm_notifier+0x18/0x20
> [ 97.671581] telemetry_debugfs_init+0x92/0x1000
Pushed to testing, thanks!
Darren, do we need this in v4.12-rcX?
>
> Signed-off-by: Priyalee Kushwaha <priyalee.kushwaha@xxxxxxxxx>
> ---
> drivers/platform/x86/intel_telemetry_debugfs.c | 16 +++++++---------
> 1 file changed, 7 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/platform/x86/intel_telemetry_debugfs.c b/drivers/platform/x86/intel_telemetry_debugfs.c
> index ef29f18..4cc2f4e 100644
> --- a/drivers/platform/x86/intel_telemetry_debugfs.c
> +++ b/drivers/platform/x86/intel_telemetry_debugfs.c
> @@ -97,11 +97,9 @@
> } \
> }
>
> -#ifdef CONFIG_PM_SLEEP
> static u8 suspend_prep_ok;
> static u32 suspend_shlw_ctr_temp, suspend_deep_ctr_temp;
> static u64 suspend_shlw_res_temp, suspend_deep_res_temp;
> -#endif
>
> struct telemetry_susp_stats {
> u32 shlw_swake_ctr;
> @@ -807,7 +805,6 @@ static const struct file_operations telem_ioss_trc_verb_ops = {
> .release = single_release,
> };
>
> -#ifdef CONFIG_PM_SLEEP
> static int pm_suspend_prep_cb(void)
> {
> struct telemetry_evtlog evtlog[TELEM_MAX_OS_ALLOCATED_EVENTS];
> @@ -937,7 +934,6 @@ static int pm_notification(struct notifier_block *this,
> static struct notifier_block pm_notifier = {
> .notifier_call = pm_notification,
> };
> -#endif /* CONFIG_PM_SLEEP */
>
> static int __init telemetry_debugfs_init(void)
> {
> @@ -960,14 +956,13 @@ static int __init telemetry_debugfs_init(void)
> if (err < 0)
> return -EINVAL;
>
> -
> -#ifdef CONFIG_PM_SLEEP
> register_pm_notifier(&pm_notifier);
> -#endif /* CONFIG_PM_SLEEP */
>
> debugfs_conf->telemetry_dbg_dir = debugfs_create_dir("telemetry", NULL);
> - if (!debugfs_conf->telemetry_dbg_dir)
> - return -ENOMEM;
> + if (!debugfs_conf->telemetry_dbg_dir) {
> + err = -ENOMEM;
> + goto out_pm;
> + }
>
> f = debugfs_create_file("pss_info", S_IFREG | S_IRUGO,
> debugfs_conf->telemetry_dbg_dir, NULL,
> @@ -1014,6 +1009,8 @@ static int __init telemetry_debugfs_init(void)
> out:
> debugfs_remove_recursive(debugfs_conf->telemetry_dbg_dir);
> debugfs_conf->telemetry_dbg_dir = NULL;
> +out_pm:
> + unregister_pm_notifier(&pm_notifier);
>
> return err;
> }
> @@ -1022,6 +1019,7 @@ static void __exit telemetry_debugfs_exit(void)
> {
> debugfs_remove_recursive(debugfs_conf->telemetry_dbg_dir);
> debugfs_conf->telemetry_dbg_dir = NULL;
> + unregister_pm_notifier(&pm_notifier);
> }
>
> late_initcall(telemetry_debugfs_init);
> --
> 2.10.0
>
--
With Best Regards,
Andy Shevchenko
