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From: Michael Nazzareno Trimarchi <michael@amarulasolutions.com>
Date: Sat, 19 Aug 2017 18:05:56 +0200
Message-ID: <CAOf5uw=DQ1YmuLEAnpjJaLE=oPod3g1WVubMfaWTjNHwOquKhQ@mail.gmail.com>
Subject: Re: [PATCH 3.16 097/134] power: supply: pda_power: move from timer to delayed_work
To: Ben Hutchings <ben@decadent.org.uk>
Cc: LKML <linux-kernel@vger.kernel.org>, stable@vger.kernel.org,
        akpm@linux-foundation.org,
        Anthony Brandon <anthony@amarulasolutions.com>,
        Sebastian Reichel <sebastian.reichel@collabora.co.uk>
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Hi Ben

On Fri, Aug 18, 2017 at 3:13 PM, Ben Hutchings <ben@decadent.org.uk> wrote:
> 3.16.47-rc1 review patch.  If anyone has any objections, please let me know.
>
> ------------------
>
> From: Michael Trimarchi <michael@amarulasolutions.com>
>
> commit 633e8799ddc09431be2744c4a1efdbda13af2b0b upstream.
>
> This changed is needed to avoid locking problem during
> boot as shown:
>

No objection

Michael

> <5>[    8.824096] Registering SWP/SWPB emulation handler
> <6>[    8.977294] clock: disabling unused clocks to save power
> <3>[    9.108154] BUG: sleeping function called from invalid context at kernel_albert/kernel/mutex.c:269
> <3>[    9.122894] in_atomic(): 1, irqs_disabled(): 0, pid: 1, name: swapper/0
> <4>[    9.130249] 3 locks held by swapper/0/1:
> <4>[    9.134613]  #0:  (&__lockdep_no_validate__){......}, at: [<c0342430>] __driver_attach+0x58/0xa8
> <4>[    9.144500]  #1:  (&__lockdep_no_validate__){......}, at: [<c0342440>] __driver_attach+0x68/0xa8
> <4>[    9.154357]  #2:  (&polling_timer){......}, at: [<c0053770>] run_timer_softirq+0x108/0x3ec
> <4>[    9.163726] Backtrace:
> <4>[    9.166473] [<c001269c>] (dump_backtrace+0x0/0x114) from [<c067e5f0>] (dump_stack+0x20/0x24)
> <4>[    9.175811]  r6:00203230 r5:0000010d r4:d782e000 r3:60000113
> <4>[    9.182250] [<c067e5d0>] (dump_stack+0x0/0x24) from [<c007441c>] (__might_sleep+0x10c/0x128)
> <4>[    9.191650] [<c0074310>] (__might_sleep+0x0/0x128) from [<c0688f60>] (mutex_lock_nested+0x34/0x36c)
> <4>[    9.201660]  r5:c02d5350 r4:d79a0c64
> <4>[    9.205688] [<c0688f2c>] (mutex_lock_nested+0x0/0x36c) from [<c02d5350>] (regulator_set_current_limit+0x30/0x118)
> <4>[    9.217071] [<c02d5320>] (regulator_set_current_limit+0x0/0x118) from [<c0435ce0>] (update_charger+0x84/0xc4)
> <4>[    9.228027]  r7:d782fb20 r6:00000101 r5:c1767e94 r4:00000000
> <4>[    9.234436] [<c0435c5c>] (update_charger+0x0/0xc4) from [<c0435d40>] (psy_changed+0x20/0x48)
> <4>[    9.243804]  r5:d782e000 r4:c1767e94
> <4>[    9.247802] [<c0435d20>] (psy_changed+0x0/0x48) from [<c0435dec>] (polling_timer_func+0x84/0xb8)
> <4>[    9.257537]  r4:c1767e94 r3:00000002
> <4>[    9.261566] [<c0435d68>] (polling_timer_func+0x0/0xb8) from [<c00537e4>] (run_timer_softirq+0x17c/0x3ec)
> <4>[    9.272033]  r4:c1767eb0 r3:00000000
> <4>[    9.276062] [<c0053668>] (run_timer_softirq+0x0/0x3ec) from [<c004b000>] (__do_softirq+0xf0/0x298)
> <4>[    9.286010] [<c004af10>] (__do_softirq+0x0/0x298) from [<c004b650>] (irq_exit+0x98/0xa0)
> <4>[    9.295013] [<c004b5b8>] (irq_exit+0x0/0xa0) from [<c000edbc>] (handle_IRQ+0x60/0xc0)
> <4>[    9.303680]  r4:c1194e98 r3:c00bc778
> <4>[    9.307708] [<c000ed5c>] (handle_IRQ+0x0/0xc0) from [<c0008504>] (gic_handle_irq+0x34/0x68)
> <4>[    9.316955]  r8:000ac383 r7:d782fc3c r6:d782fc08 r5:c11936c4 r4:e0802100
> <4>[    9.324310] r3:c026ba48
> <4>[    9.327301] [<c00084d0>] (gic_handle_irq+0x0/0x68) from [<c068c2c0>] (__irq_svc+0x40/0x74)
> <4>[    9.336456] Exception stack(0xd782fc08 to 0xd782fc50)
> <4>[    9.342041] fc00:                   d6e30e6c ac383627 00000000 ac383417 ea19c000 ea200000
> <4>[    9.351104] fc20: beffffff 00000667 000ac383 d6e30670 d6e3066c d782fc94 d782fbe8 d782fc50
> <4>[    9.360168] fc40: c026ba48 c001d1f0 00000113 ffffffff
>
> Fixes: b2998049cfae ("[BATTERY] pda_power platform driver")
> Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
> Signed-off-by: Anthony Brandon <anthony@amarulasolutions.com>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
> [bwh: Backported to 3.16: adjust filename]
> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
> ---
>  drivers/power/pda_power.c | 49 ++++++++++++++++++++++------------------
>  1 file changed, 27 insertions(+), 22 deletions(-)
>
> --- a/drivers/power/pda_power.c
> +++ b/drivers/power/pda_power.c
> @@ -30,9 +30,9 @@ static inline unsigned int get_irq_flags
>  static struct device *dev;
>  static struct pda_power_pdata *pdata;
>  static struct resource *ac_irq, *usb_irq;
> -static struct timer_list charger_timer;
> -static struct timer_list supply_timer;
> -static struct timer_list polling_timer;
> +static struct delayed_work charger_work;
> +static struct delayed_work polling_work;
> +static struct delayed_work supply_work;
>  static int polling;
>
>  #if IS_ENABLED(CONFIG_USB_PHY)
> @@ -143,7 +143,7 @@ static void update_charger(void)
>         }
>  }
>
> -static void supply_timer_func(unsigned long unused)
> +static void supply_work_func(struct work_struct *work)
>  {
>         if (ac_status == PDA_PSY_TO_CHANGE) {
>                 ac_status = new_ac_status;
> @@ -164,11 +164,12 @@ static void psy_changed(void)
>          * Okay, charger set. Now wait a bit before notifying supplicants,
>          * charge power should stabilize.
>          */
> -       mod_timer(&supply_timer,
> -                 jiffies + msecs_to_jiffies(pdata->wait_for_charger));
> +       cancel_delayed_work(&supply_work);
> +       schedule_delayed_work(&supply_work,
> +                             msecs_to_jiffies(pdata->wait_for_charger));
>  }
>
> -static void charger_timer_func(unsigned long unused)
> +static void charger_work_func(struct work_struct *work)
>  {
>         update_status();
>         psy_changed();
> @@ -187,13 +188,14 @@ static irqreturn_t power_changed_isr(int
>          * Wait a bit before reading ac/usb line status and setting charger,
>          * because ac/usb status readings may lag from irq.
>          */
> -       mod_timer(&charger_timer,
> -                 jiffies + msecs_to_jiffies(pdata->wait_for_status));
> +       cancel_delayed_work(&charger_work);
> +       schedule_delayed_work(&charger_work,
> +                             msecs_to_jiffies(pdata->wait_for_status));
>
>         return IRQ_HANDLED;
>  }
>
> -static void polling_timer_func(unsigned long unused)
> +static void polling_work_func(struct work_struct *work)
>  {
>         int changed = 0;
>
> @@ -214,8 +216,9 @@ static void polling_timer_func(unsigned
>         if (changed)
>                 psy_changed();
>
> -       mod_timer(&polling_timer,
> -                 jiffies + msecs_to_jiffies(pdata->polling_interval));
> +       cancel_delayed_work(&polling_work);
> +       schedule_delayed_work(&polling_work,
> +                             msecs_to_jiffies(pdata->polling_interval));
>  }
>
>  #if IS_ENABLED(CONFIG_USB_PHY)
> @@ -253,8 +256,9 @@ static int otg_handle_notification(struc
>          * Wait a bit before reading ac/usb line status and setting charger,
>          * because ac/usb status readings may lag from irq.
>          */
> -       mod_timer(&charger_timer,
> -                 jiffies + msecs_to_jiffies(pdata->wait_for_status));
> +       cancel_delayed_work(&charger_work);
> +       schedule_delayed_work(&charger_work,
> +                             msecs_to_jiffies(pdata->wait_for_status));
>
>         return NOTIFY_OK;
>  }
> @@ -302,8 +306,8 @@ static int pda_power_probe(struct platfo
>         if (!pdata->ac_max_uA)
>                 pdata->ac_max_uA = 500000;
>
> -       setup_timer(&charger_timer, charger_timer_func, 0);
> -       setup_timer(&supply_timer, supply_timer_func, 0);
> +       INIT_DELAYED_WORK(&charger_work, charger_work_func);
> +       INIT_DELAYED_WORK(&supply_work, supply_work_func);
>
>         ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
>         usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
> @@ -381,9 +385,10 @@ static int pda_power_probe(struct platfo
>
>         if (polling) {
>                 dev_dbg(dev, "will poll for status\n");
> -               setup_timer(&polling_timer, polling_timer_func, 0);
> -               mod_timer(&polling_timer,
> -                         jiffies + msecs_to_jiffies(pdata->polling_interval));
> +               INIT_DELAYED_WORK(&polling_work, polling_work_func);
> +               cancel_delayed_work(&polling_work);
> +               schedule_delayed_work(&polling_work,
> +                                     msecs_to_jiffies(pdata->polling_interval));
>         }
>
>         if (ac_irq || usb_irq)
> @@ -429,9 +434,9 @@ static int pda_power_remove(struct platf
>                 free_irq(ac_irq->start, &pda_psy_ac);
>
>         if (polling)
> -               del_timer_sync(&polling_timer);
> -       del_timer_sync(&charger_timer);
> -       del_timer_sync(&supply_timer);
> +               cancel_delayed_work_sync(&polling_work);
> +       cancel_delayed_work_sync(&charger_work);
> +       cancel_delayed_work_sync(&supply_work);
>
>         if (pdata->is_usb_online)
>                 power_supply_unregister(&pda_psy_usb);
>



-- 
| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
| COO  -  Founder                                      Cruquiuskade 47 |
| +31(0)851119172                                 Amsterdam 1018 AM NL |
|                  [`as] http://www.amarulasolutions.com               |