linux-kernel - Re: [PATCH] misc: rtsx: Avoid mangling IRQ during runtime PM

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Date:   Fri, 3 Dec 2021 10:17:24 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Ricky Wu <ricky_wu@...ltek.com>
Cc:     gregkh@...uxfoundation.org, Arnd Bergmann <arnd@...db.de>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] misc: rtsx: Avoid mangling IRQ during runtime PM

Hi Rick,

On Fri, Nov 26, 2021 at 8:33 AM Kai-Heng Feng
<kai.heng.feng@...onical.com> wrote:
>
> After commit 5b4258f6721f ("misc: rtsx: rts5249 support runtime PM"), when the
> rtsx controller is runtime suspended, bring CPUs offline and back online, the
> runtime resume of the controller will fail:
>
> [   47.319391] smpboot: CPU 1 is now offline
> [   47.414140] x86: Booting SMP configuration:
> [   47.414147] smpboot: Booting Node 0 Processor 1 APIC 0x2
> [   47.571334] smpboot: CPU 2 is now offline
> [   47.686055] smpboot: Booting Node 0 Processor 2 APIC 0x4
> [   47.808174] smpboot: CPU 3 is now offline
> [   47.878146] smpboot: Booting Node 0 Processor 3 APIC 0x6
> [   48.003679] smpboot: CPU 4 is now offline
> [   48.086187] smpboot: Booting Node 0 Processor 4 APIC 0x1
> [   48.239627] smpboot: CPU 5 is now offline
> [   48.326059] smpboot: Booting Node 0 Processor 5 APIC 0x3
> [   48.472193] smpboot: CPU 6 is now offline
> [   48.574181] smpboot: Booting Node 0 Processor 6 APIC 0x5
> [   48.743375] smpboot: CPU 7 is now offline
> [   48.838047] smpboot: Booting Node 0 Processor 7 APIC 0x7
> [   48.965447] __common_interrupt: 1.35 No irq handler for vector
> [   51.174065] mmc0: error -110 doing runtime resume
> [   54.978088] I/O error, dev mmcblk0, sector 21479 op 0x1:(WRITE) flags 0x0 phys_seg 11 prio class 0
> [   54.978108] Buffer I/O error on dev mmcblk0p1, logical block 19431, lost async page write
> [   54.978129] Buffer I/O error on dev mmcblk0p1, logical block 19432, lost async page write
> [   54.978134] Buffer I/O error on dev mmcblk0p1, logical block 19433, lost async page write
> [   54.978137] Buffer I/O error on dev mmcblk0p1, logical block 19434, lost async page write
> [   54.978141] Buffer I/O error on dev mmcblk0p1, logical block 19435, lost async page write
> [   54.978145] Buffer I/O error on dev mmcblk0p1, logical block 19436, lost async page write
> [   54.978148] Buffer I/O error on dev mmcblk0p1, logical block 19437, lost async page write
> [   54.978152] Buffer I/O error on dev mmcblk0p1, logical block 19438, lost async page write
> [   54.978155] Buffer I/O error on dev mmcblk0p1, logical block 19439, lost async page write
> [   54.978160] Buffer I/O error on dev mmcblk0p1, logical block 19440, lost async page write
> [   54.978244] mmc0: card aaaa removed
> [   54.978452] FAT-fs (mmcblk0p1): FAT read failed (blocknr 4257)
>
> There's interrupt immediately raised on rtsx_pci_write_register() in
> runtime resume routine, but the IRQ handler hasn't registered yet.
>
> So we can either move rtsx_pci_write_register() after rtsx_pci_acquire_irq(),
> or just stop mangling IRQ on runtime PM. Choose the latter to save some
> CPU cycles.
>
> BugLink: https://bugs.launchpad.net/bugs/1951784
> Fixes: 5b4258f6721f ("misc: rtsx: rts5249 support runtime PM")
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>

May I get an Ack from you?

Kai-Heng

> ---
>  drivers/misc/cardreader/rtsx_pcr.c | 4 ----
>  1 file changed, 4 deletions(-)
>
> diff --git a/drivers/misc/cardreader/rtsx_pcr.c b/drivers/misc/cardreader/rtsx_pcr.c
> index 8c72eb590f79d..6ac509c1821c9 100644
> --- a/drivers/misc/cardreader/rtsx_pcr.c
> +++ b/drivers/misc/cardreader/rtsx_pcr.c
> @@ -1803,8 +1803,6 @@ static int rtsx_pci_runtime_suspend(struct device *device)
>         mutex_lock(&pcr->pcr_mutex);
>         rtsx_pci_power_off(pcr, HOST_ENTER_S3);
>
> -       free_irq(pcr->irq, (void *)pcr);
> -
>         mutex_unlock(&pcr->pcr_mutex);
>
>         pcr->is_runtime_suspended = true;
> @@ -1825,8 +1823,6 @@ static int rtsx_pci_runtime_resume(struct device *device)
>         mutex_lock(&pcr->pcr_mutex);
>
>         rtsx_pci_write_register(pcr, HOST_SLEEP_STATE, 0x03, 0x00);
> -       rtsx_pci_acquire_irq(pcr);
> -       synchronize_irq(pcr->irq);
>
>         if (pcr->ops->fetch_vendor_settings)
>                 pcr->ops->fetch_vendor_settings(pcr);
> --
> 2.32.0
>