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Subject[PATCH v3] firewire: Fix ohci free_irq() warning
Date
This patch fixes the kernel warning below, generated when putting an
MSI MS-1727 GT740 laptop into suspend mode. The call sequence in this
case calls free_irq() twice, once in pci_suspend() and once then in
pci_remove().

The fix breaks up the ohci_enable() call into four separate calls -
ohci_enable_regs(), ohci_create_irq(), ohci_enable_irq() and
ohci_enable_run(). The original call sequence of ohci_enable() is replaced
by the four calls, but the ohci_enable() called from pci_resume() is
replaced by three of the calls, missing out ohci_create_irq().

Finally, a new call, ohci_disable_irq(), replaces the free_irq() in
pci_suspend() which sets the irq mask to zero.

[ 262.299486] WARNING: at /build/buildd/linux-3.5.0/kernel/irq/manage.c:1198 __free_irq+0xa3/0x1e0()
[ 262.299487] Hardware name: MS-1727
[ 262.299488] Trying to free already-free IRQ 16
[ 262.299488] Modules linked in: ip6table_filter ip6_tables ebtable_nat ebtables xt_state ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter snd_hda_codec_hdmi ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables bridge stp llc joydev arc4 parport_pc ppdev coretemp kvm_intel snd_hda_codec_realtek kvm microcode snd_seq_midi snd_rawmidi psmouse snd_seq_midi_event serio_raw nvidia(PO) i7core_edac snd_seq edac_core snd_hda_intel iwlwifi snd_hda_codec jmb38x_ms snd_hwdep mac80211 snd_pcm lpc_ich memstick snd_seq_device cfg80211 snd_timer snd soundcore snd_page_alloc ir_lirc_codec lirc_dev ir_mce_kbd_decoder ir_sanyo_decoder ir_sony_decoder ir_jvc_decoder ir_rc6_decoder ir_rc5_decoder ir_nec_decoder rfcomm bnep rc_rc6_mce mxm_wmi ene_ir rc_core bluetooth wmi video acpiphp mac_hid lp parport binfmt_misc hid_generic usbhid hid firewire_ohci sdhci_pci r8169 firewire_core sdhci crc_itu_t
[ 262.299537] Pid: 4, comm: kworker/0:0 Tainted: P O 3.5.0-22-generic #34-Ubuntu
[ 262.299538] Call Trace:
[ 262.299540] [<ffffffff81051c1f>] warn_slowpath_common+0x7f/0xc0
[ 262.299545] [<ffffffff81051d16>] warn_slowpath_fmt+0x46/0x50
[ 262.299548] [<ffffffff8103fa39>] ? default_spin_lock_flags+0x9/0x10
[ 262.299551] [<ffffffff810df6b3>] __free_irq+0xa3/0x1e0
[ 262.299554] [<ffffffff810df844>] free_irq+0x54/0xc0
[ 262.299558] [<ffffffffa005a27e>] pci_remove+0x6e/0x210 [firewire_ohci]
[ 262.299564] [<ffffffff8135ae7f>] pci_device_remove+0x3f/0x110
[ 262.299569] [<ffffffff8141fdbc>] __device_release_driver+0x7c/0xe0
[ 262.299573] [<ffffffff8141fe4c>] device_release_driver+0x2c/0x40
[ 262.299576] [<ffffffff8141f5f1>] bus_remove_device+0xe1/0x120
[ 262.299578] [<ffffffff8141cd1a>] device_del+0x12a/0x1c0
[ 262.299581] [<ffffffff8141cdc6>] device_unregister+0x16/0x30
[ 262.299583] [<ffffffff81354784>] pci_stop_bus_device+0x94/0xa0
[ 262.299588] [<ffffffffa0091c67>] acpiphp_disable_slot+0xb7/0x1a0 [acpiphp]
[ 262.299594] [<ffffffffa0090716>] ? get_slot_status+0x46/0xc0 [acpiphp]
[ 262.299599] [<ffffffffa0091d7d>] acpiphp_check_bridge.isra.15+0x2d/0xf0 [acpiphp]
[ 262.299604] [<ffffffffa0092442>] _handle_hotplug_event_bridge+0x372/0x4d0 [acpiphp]
[ 262.299608] [<ffffffff81390f8c>] ? acpi_os_execute_deferred+0x2f/0x34
[ 262.299612] [<ffffffff8116e22d>] ? kfree+0xed/0x110
[ 262.299617] [<ffffffff8107086a>] process_one_work+0x12a/0x420
[ 262.299620] [<ffffffffa00920d0>] ? _handle_hotplug_event_func+0x1d0/0x1d0 [acpiphp]
[ 262.299625] [<ffffffff8107141e>] worker_thread+0x12e/0x2f0
[ 262.299627] [<ffffffff810712f0>] ? manage_workers.isra.26+0x200/0x200
[ 262.299629] [<ffffffff81075f13>] kthread+0x93/0xa0
[ 262.299632] [<ffffffff8168d024>] kernel_thread_helper+0x4/0x10
[ 262.299636] [<ffffffff81075e80>] ? kthread_freezable_should_stop+0x70/0x70
[ 262.299639] [<ffffffff8168d020>] ? gs_change+0x13/0x13
[ 262.299641] ---[ end trace 3f830890e076911f ]---

Signed-off-by: Mark Einon <mark.einon@gmail.com>
---

Note - This patch has only been tested with a firewire controller, and
not subsequently with any devices plugged into the controller.

drivers/firewire/ohci.c | 134 ++++++++++++++++++++++++++++++++---------------
1 file changed, 91 insertions(+), 43 deletions(-)

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 45912e6..56814b8 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2242,12 +2242,69 @@ static int probe_tsb41ba3d(struct fw_ohci *ohci)
return 1;
}

-static int ohci_enable(struct fw_card *card,
- const __be32 *config_rom, size_t length)
+static int ohci_create_irq(struct fw_card *card)
{
struct fw_ohci *ohci = fw_ohci(card);
struct pci_dev *dev = to_pci_dev(card->device);
- u32 lps, version, irqs;
+
+ if (!(ohci->quirks & QUIRK_NO_MSI))
+ pci_enable_msi(dev);
+ if (request_irq(dev->irq, irq_handler,
+ pci_dev_msi_enabled(dev) ? 0 : IRQF_SHARED,
+ ohci_driver_name, ohci)) {
+ dev_err(card->device, "failed to allocate interrupt %d\n",
+ dev->irq);
+ pci_disable_msi(dev);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void ohci_disable_irq(struct fw_ohci *ohci)
+{
+ reg_write(ohci, OHCI1394_IntMaskSet, 0);
+
+ reg_write(ohci, OHCI1394_HCControlSet,
+ ~(OHCI1394_HCControl_linkEnable &
+ OHCI1394_HCControl_BIBimageValid));
+
+ reg_write(ohci, OHCI1394_LinkControlSet,
+ ~(OHCI1394_LinkControl_rcvSelfID &
+ OHCI1394_LinkControl_rcvPhyPkt));
+}
+
+static void ohci_enable_irq(struct fw_ohci *ohci)
+{
+ int irqs = OHCI1394_reqTxComplete | OHCI1394_respTxComplete |
+ OHCI1394_RQPkt | OHCI1394_RSPkt |
+ OHCI1394_isochTx | OHCI1394_isochRx |
+ OHCI1394_postedWriteErr |
+ OHCI1394_selfIDComplete |
+ OHCI1394_regAccessFail |
+ OHCI1394_cycleInconsistent |
+ OHCI1394_unrecoverableError |
+ OHCI1394_cycleTooLong |
+ OHCI1394_masterIntEnable;
+
+ if (param_debug & OHCI_PARAM_DEBUG_BUSRESETS)
+ irqs |= OHCI1394_busReset;
+ reg_write(ohci, OHCI1394_IntMaskSet, irqs);
+
+ reg_write(ohci, OHCI1394_HCControlSet,
+ OHCI1394_HCControl_linkEnable |
+ OHCI1394_HCControl_BIBimageValid);
+
+ reg_write(ohci, OHCI1394_LinkControlSet,
+ OHCI1394_LinkControl_rcvSelfID |
+ OHCI1394_LinkControl_rcvPhyPkt);
+}
+
+static int ohci_enable_regs(struct fw_card *card,
+ const __be32 *config_rom, size_t length)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+ u32 lps, version;
int i, ret;

if (software_reset(ohci)) {
@@ -2382,53 +2439,41 @@ static int ohci_enable(struct fw_card *card,

reg_write(ohci, OHCI1394_AsReqFilterHiSet, 0x80000000);

- if (!(ohci->quirks & QUIRK_NO_MSI))
- pci_enable_msi(dev);
- if (request_irq(dev->irq, irq_handler,
- pci_dev_msi_enabled(dev) ? 0 : IRQF_SHARED,
- ohci_driver_name, ohci)) {
- dev_err(card->device, "failed to allocate interrupt %d\n",
- dev->irq);
- pci_disable_msi(dev);
+ return 0;
+}
+
+static void ohci_enable_run(struct fw_ohci *ohci)
+{
+ ar_context_run(&ohci->ar_request_ctx);
+ ar_context_run(&ohci->ar_response_ctx);

+ flush_writes(ohci);
+
+ /* We are ready to go, reset bus to finish initialization. */
+ fw_schedule_bus_reset(&ohci->card, false, true);
+}
+
+static int ohci_enable(struct fw_card *card,
+ const __be32 *config_rom, size_t length)
+{
+ struct fw_ohci *ohci = fw_ohci(card);
+ int ret;
+
+ ohci_enable_regs(card, config_rom, length);
+
+ ret = ohci_create_irq(card);
+ if (ret) {
if (config_rom) {
dma_free_coherent(ohci->card.device, CONFIG_ROM_SIZE,
ohci->next_config_rom,
ohci->next_config_rom_bus);
ohci->next_config_rom = NULL;
}
- return -EIO;
+ return ret;
}

- irqs = OHCI1394_reqTxComplete | OHCI1394_respTxComplete |
- OHCI1394_RQPkt | OHCI1394_RSPkt |
- OHCI1394_isochTx | OHCI1394_isochRx |
- OHCI1394_postedWriteErr |
- OHCI1394_selfIDComplete |
- OHCI1394_regAccessFail |
- OHCI1394_cycleInconsistent |
- OHCI1394_unrecoverableError |
- OHCI1394_cycleTooLong |
- OHCI1394_masterIntEnable;
- if (param_debug & OHCI_PARAM_DEBUG_BUSRESETS)
- irqs |= OHCI1394_busReset;
- reg_write(ohci, OHCI1394_IntMaskSet, irqs);
-
- reg_write(ohci, OHCI1394_HCControlSet,
- OHCI1394_HCControl_linkEnable |
- OHCI1394_HCControl_BIBimageValid);
-
- reg_write(ohci, OHCI1394_LinkControlSet,
- OHCI1394_LinkControl_rcvSelfID |
- OHCI1394_LinkControl_rcvPhyPkt);
-
- ar_context_run(&ohci->ar_request_ctx);
- ar_context_run(&ohci->ar_response_ctx);
-
- flush_writes(ohci);
-
- /* We are ready to go, reset bus to finish initialization. */
- fw_schedule_bus_reset(&ohci->card, false, true);
+ ohci_enable_irq(ohci);
+ ohci_enable_run(ohci);

return 0;
}
@@ -3766,7 +3811,7 @@ static int pci_suspend(struct pci_dev *dev, pm_message_t state)
int err;

software_reset(ohci);
- free_irq(dev->irq, ohci);
+ ohci_disable_irq(ohci);
pci_disable_msi(dev);
err = pci_save_state(dev);
if (err) {
@@ -3802,10 +3847,13 @@ static int pci_resume(struct pci_dev *dev)
reg_write(ohci, OHCI1394_GUIDHi, (u32)(ohci->card.guid >> 32));
}

- err = ohci_enable(&ohci->card, NULL, 0);
+ err = ohci_enable_regs(&ohci->card, NULL, 0);
if (err)
return err;

+ ohci_enable_irq(ohci);
+ ohci_enable_run(ohci);
+
ohci_resume_iso_dma(ohci);

return 0;
--
1.7.10.4


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