[3.16.y-ckt stable] Patch "drm/radeon: fix hotplug race at startup" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Thu Sep 3 10:36:54 UTC 2015


This is a note to let you know that I have just added a patch titled

    drm/radeon: fix hotplug race at startup

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt17.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 87fdee8a92b03645d126d4ea11cf9299b2d777b2 Mon Sep 17 00:00:00 2001
From: Dave Airlie <airlied at redhat.com>
Date: Thu, 20 Aug 2015 10:13:55 +1000
Subject: drm/radeon: fix hotplug race at startup

commit 7f98ca454ad373fc1b76be804fa7138ff68c1d27 upstream.

We apparantly get a hotplug irq before we've initialised
modesetting,

[drm] Loading R100 Microcode
BUG: unable to handle kernel NULL pointer dereference at   (null)
IP: [<c125f56f>] __mutex_lock_slowpath+0x23/0x91
*pde = 00000000
Oops: 0002 [#1]
Modules linked in: radeon(+) drm_kms_helper ttm drm i2c_algo_bit backlight pcspkr psmouse evdev sr_mod input_leds led_class cdrom sg parport_pc parport floppy intel_agp intel_gtt lpc_ich acpi_cpufreq processor button mfd_core agpgart uhci_hcd ehci_hcd rng_core snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm usbcore usb_common i2c_i801 i2c_core snd_timer snd soundcore thermal_sys
CPU: 0 PID: 15 Comm: kworker/0:1 Not tainted 4.2.0-rc7-00015-gbf67402 #111
Hardware name: MicroLink                               /D850MV                         , BIOS MV85010A.86A.0067.P24.0304081124 04/08/2003
Workqueue: events radeon_hotplug_work_func [radeon]
task: f6ca5900 ti: f6d3e000 task.ti: f6d3e000
EIP: 0060:[<c125f56f>] EFLAGS: 00010282 CPU: 0
EIP is at __mutex_lock_slowpath+0x23/0x91
EAX: 00000000 EBX: f5e900fc ECX: 00000000 EDX: fffffffe
ESI: f6ca5900 EDI: f5e90100 EBP: f5e90000 ESP: f6d3ff0c
 DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
CR0: 8005003b CR2: 00000000 CR3: 36f61000 CR4: 000006d0
Stack:
 f5e90100 00000000 c103c4c1 f6d2a5a0 f5e900fc f6df394c c125f162 f8b0faca
 f6d2a5a0 c138ca00 f6df394c f7395600 c1034741 00d40000 00000000 f6d2a5a0
 c138ca00 f6d2a5b8 c138ca10 c1034b58 00000001 f6d40000 f6ca5900 f6d0c940
Call Trace:
 [<c103c4c1>] ? dequeue_task_fair+0xa4/0xb7
 [<c125f162>] ? mutex_lock+0x9/0xa
 [<f8b0faca>] ? radeon_hotplug_work_func+0x17/0x57 [radeon]
 [<c1034741>] ? process_one_work+0xfc/0x194
 [<c1034b58>] ? worker_thread+0x18d/0x218
 [<c10349cb>] ? rescuer_thread+0x1d5/0x1d5
 [<c103742a>] ? kthread+0x7b/0x80
 [<c12601c0>] ? ret_from_kernel_thread+0x20/0x30
 [<c10373af>] ? init_completion+0x18/0x18
Code: 42 08 e8 8e a6 dd ff c3 57 56 53 83 ec 0c 8b 35 48 f7 37 c1 8b 10 4a 74 1a 89 c3 8d 78 04 8b 40 08 89 63

Reported-and-Tested-by: Meelis Roos <mroos at linux.ee>
Signed-off-by: Dave Airlie <airlied at redhat.com>
Cc: Jan Beulich <JBeulich at suse.com>
Cc: Jiri Slaby <jslaby at suse.cz>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/gpu/drm/radeon/radeon_irq_kms.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/radeon/radeon_irq_kms.c b/drivers/gpu/drm/radeon/radeon_irq_kms.c
index dd49f8c61878..4ae8c2c49d52 100644
--- a/drivers/gpu/drm/radeon/radeon_irq_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_irq_kms.c
@@ -79,6 +79,11 @@ static void radeon_hotplug_work_func(struct work_struct *work)
 	struct drm_mode_config *mode_config = &dev->mode_config;
 	struct drm_connector *connector;

+	/* we can race here at startup, some boards seem to trigger
+	 * hotplug irqs when they shouldn't. */
+	if (!rdev->mode_info.mode_config_initialized)
+		return;
+
 	mutex_lock(&mode_config->mutex);
 	if (mode_config->num_connector) {
 		list_for_each_entry(connector, &mode_config->connector_list, head)




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