Hello, Here is a proposed patch against trunk for fixing this bug. Patch was written initial by Arnaud Patard, later changed by Uwe Kleine-König.
Best regards
Index: debian/patches/bugfix/arm/rtc_mutex_lockup.patch
===================================================================
--- debian/patches/bugfix/arm/rtc_mutex_lockup.patch (revision 0)
+++ debian/patches/bugfix/arm/rtc_mutex_lockup.patch (revision 0)
@@ -0,0 +1,80 @@
+Fix rtc-mc13xxx lockup
+
+Fix this lock up :
+
+
+[ 240.159703] INFO: task swapper:1 blocked for more than 120 seconds.
+[ 240.166030] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
+[ 240.173976] swapper D c03e688c 0 1 0 0x00000000
+[ 240.180483] Backtrace:
+[ 240.183066] [<c03e65d0>] (schedule+0x0/0x2f0) from [<c03e72f8>]
(__mutex_lock_slowpath+0x88/0xb4)
+[ 240.192086] [<c03e7270>] (__mutex_lock_slowpath+0x0/0xb4) from [<c03e7588>]
(mutex_lock+0x30/0x34)
+[ 240.201151] r8:00000001 r7:df83fd8c r6:00000000 r5:df83fd8c r4:dfbd1204
+[ 240.208091] [<c03e7558>] (mutex_lock+0x0/0x34) from [<c0206644>]
(mc13xxx_lock+0x28/0x2c)
+[ 240.216403] r4:dfbd1204 r3:ffffffff
+[ 240.220181] [<c020661c>] (mc13xxx_lock+0x0/0x2c) from [<c0284d08>]
(mc13xxx_rtc_read_time+0x24/0xf4)
+[ 240.229377] r4:dfbabc40 r3:c0284ce4
+[ 240.233127] [<c0284ce4>] (mc13xxx_rtc_read_time+0x0/0xf4) from [<c0282bd4>]
(__rtc_read_time+0x50/0x5c)
+[ 240.243441] r6:00000000 r5:df83fd8c r4:dfb46c00
+[ 240.248211] [<c0282b84>] (__rtc_read_time+0x0/0x5c) from [<c0282ebc>]
(rtc_read_time+0x34/0x48)
+[ 240.257020] r5:dfb46c00 r4:dfb46ce0
+[ 240.260763] [<c0282e88>] (rtc_read_time+0x0/0x48) from [<c0283090>]
(__rtc_read_alarm+0x24/0x27c)
+[ 240.269740] r7:dfb46c00 r6:dfbdcbd8 r5:dfb46c00 r4:df83fdec
+[ 240.275582] [<c028306c>] (__rtc_read_alarm+0x0/0x27c) from [<c0282994>]
(rtc_device_register+0x160/0x284)
+[ 240.285320] [<c0282834>] (rtc_device_register+0x0/0x284) from [<c03e54a8>]
(mc13xxx_rtc_probe+0x104/0x18c)
+[ 240.295150] [<c03e53a4>] (mc13xxx_rtc_probe+0x0/0x18c) from [<c01fd7d4>]
(platform_drv_probe+0x1c/0x20)
+[ 240.304651] r8:00000000 r7:c0540db4 r6:c0540db4 r5:dfbdcb08 r4:dfbdcb08
+[ 240.311620] [<c01fd7b8>] (platform_drv_probe+0x0/0x20) from [<c01fc388>]
(really_probe+0xa0/0x150)
+[ 240.320730] [<c01fc2e8>] (really_probe+0x0/0x150) from [<c01fc5d0>]
(driver_probe_device+0x28/0x34)
+[ 240.329878] r7:00000000 r6:c0540db4 r5:dfbdcb3c r4:dfbdcb08
+[ 240.335725] [<c01fc5a8>] (driver_probe_device+0x0/0x34) from [<c01fc644>]
(__driver_attach+0x68/0x8c)
+[ 240.345907] [<c01fc5dc>] (__driver_attach+0x0/0x8c) from [<c01fb708>]
(bus_for_each_dev+0x58/0x88)
+[ 240.354976] r6:c01fc5dc r5:df83fee0 r4:c0540db4 r3:df80d4b4
+[ 240.360870] [<c01fb6b0>] (bus_for_each_dev+0x0/0x88) from [<c01fc1dc>]
(driver_attach+0x20/0x28)
+[ 240.369758] r7:00000000 r6:c0539c20 r5:dfba9180 r4:c0540db4
+[ 240.375604] [<c01fc1bc>] (driver_attach+0x0/0x28) from [<c01fbe0c>]
(bus_add_driver+0xb4/0x230)
+[ 240.384453] [<c01fbd58>] (bus_add_driver+0x0/0x230) from [<c01fcbc8>]
(driver_register+0xa8/0x128)
+[ 240.393568] [<c01fcb20>] (driver_register+0x0/0x128) from [<c01fdc48>]
(platform_driver_register+0x4c/0x60)
+[ 240.403469] [<c01fdbfc>] (platform_driver_register+0x0/0x60) from
[<c01fdc7c>] (platform_driver_probe+0x20/0x70)
+[ 240.413816] [<c01fdc5c>] (platform_driver_probe+0x0/0x70) from [<c001b458>]
(mc13xxx_rtc_init+0x18/0x24)
+[ 240.423406] r5:c002691c r4:c00267e4
+[ 240.427110] [<c001b440>] (mc13xxx_rtc_init+0x0/0x24) from [<c00304c0>]
(do_one_initcall+0xa4/0x174)
+[ 240.436302] [<c003041c>] (do_one_initcall+0x0/0x174) from [<c00089d4>]
(kernel_init+0xa4/0x154)
+[ 240.445916] [<c0008930>] (kernel_init+0x0/0x154) from [<c0049c74>]
(do_exit+0x0/0x250)
+[ 240.453936] r5:c0008930 r4:00000000
+
+Signed-off-by: Arnaud Patard <arnaud.pat...@rtp-net.org>
+Index: source/drivers/rtc/rtc-mc13xxx.c
+===================================================================
+--- source.orig/drivers/rtc/rtc-mc13xxx.c 2011-05-07 16:44:37.000000000
+0000
++++ source/drivers/rtc/rtc-mc13xxx.c 2011-05-07 17:15:24.000000000 +0000
+@@ -358,9 +358,14 @@
+
+ priv->rtc = rtc_device_register(pdev->name,
+ &pdev->dev, &mc13xxx_rtc_ops, THIS_MODULE);
++
++ mc13xxx_lock(mc13xxx);
++
+ if (IS_ERR(priv->rtc)) {
+ ret = PTR_ERR(priv->rtc);
+
++ mc13xxx_unlock(mc13xxx);
++
+ mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_TODA, priv);
+ err_alarm_irq_request:
+
+@@ -372,12 +377,12 @@
+ mc13xxx_irq_free(mc13xxx, MC13XXX_IRQ_RTCRST, priv);
+ err_reset_irq_request:
+
++ mc13xxx_unlock(mc13xxx);
++
+ platform_set_drvdata(pdev, NULL);
+ kfree(priv);
+ }
+
+- mc13xxx_unlock(mc13xxx);
+-
+ return ret;
+ }
+
Index: debian/patches/series/base
===================================================================
--- debian/patches/series/base (revision 17314)
+++ debian/patches/series/base (working copy)
@@ -44,3 +44,4 @@
+ bugfix/all/rt2800-disable-powersaving-as-default.patch
+ bugfix/powerpc/powerpc-kexec-Fix-build-failure-on-32-bit-SMP.patch
+ bugfix/all/xhci-hcd-Include-linux-slab.h-in-xhci-pci.c.patch
++ bugfix/arm/rtc_mutex_lockup.patch
Index: debian/changelog
===================================================================
--- debian/changelog (revision 17314)
+++ debian/changelog (working copy)
@@ -16,8 +16,13 @@
* [mips,mipsel] Disabled CONFIG_DRM_NOUVEAU and CONFIG_DRM_RADEON_KMS.
* [mips/octeon] Disabled CONFIG_HOTPLUG_CPU and CONFIG_PM.
- -- maximilian attems <m...@debian.org> Tue, 01 May 2011 14:36:33 +0100
+ [ Hector Oron ]
+ * rtc-mc13xxx.c: bugfix rtc-mc13xxx.c lockup on armhf.
+ Thanks to Arnaud Patard, Uwe Kleine-König and Vagrant Cascadian.
+ (Closes: #625804)
+ -- Hector Oron <zu...@debian.org> Sat, 07 May 2011 22:15:47 +0000
+
linux-2.6 (2.6.39~rc5-1~experimental.1) experimental; urgency=low
* New upstream release candidate
--
Héctor Orón
"Our Sun unleashes tremendous flares expelling hot gas into the Solar System,
which one day will disconnect us."
-- Day DVB-T stop working nicely
Video flare: http://antwrp.gsfc.nasa.gov/apod/ap100510.html
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