linux-kernel - [PATCH 5.15 158/171] misc: rtsx: Avoid mangling IRQ during runtime PM

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Message-Id: <20211213092950.316672624@linuxfoundation.org>
Date:   Mon, 13 Dec 2021 10:31:13 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: [PATCH 5.15 158/171] misc: rtsx: Avoid mangling IRQ during runtime PM

From: Kai-Heng Feng <kai.heng.feng@...onical.com>

commit 0edeb8992db8e7de9b8fe3164ace9a4356b17021 upstream.

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.

Fixes: 5b4258f6721f ("misc: rtsx: rts5249 support runtime PM")
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
BugLink: https://bugs.launchpad.net/bugs/1951784
Link: https://lore.kernel.org/r/20211126003246.1068770-1-kai.heng.feng@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/misc/cardreader/rtsx_pcr.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/drivers/misc/cardreader/rtsx_pcr.c
+++ b/drivers/misc/cardreader/rtsx_pcr.c
@@ -1803,8 +1803,6 @@ static int rtsx_pci_runtime_suspend(stru
 	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(struc
 	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);