On Wed, Jun 2, 2010 at 4:30 PM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 2 Jun 2010 15:26:52 -0700
> Cory Maccarrone <darkstar6262@xxxxxxxxx> wrote:
>
>> On Wed, Jun 2, 2010 at 2:05 PM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>> > On Sat, 29 May 2010 19:27:23 -0700
>> > Cory Maccarrone <darkstar6262@xxxxxxxxx> wrote:
>> >
>> >> This change removes a BUG_ON for when interrupts are disabled
>> >> during an MMC request. __During boot, interrupts can be disabled
>> >> when a request is made, causing this bug to be triggered. __In reality,
>> >> there's no reason this should halt the kernel, as the driver has proved
>> >> reliable in spite of disabled interrupts, and additionally, there's
>> >> nothing in this code that would require interrupts to be enabled.
>> >>
>> >> Signed-off-by: Cory Maccarrone <darkstar6262@xxxxxxxxx>
>> >> ---
>> >> __drivers/mmc/host/omap.c | __ __1 -
>> >> __1 files changed, 0 insertions(+), 1 deletions(-)
>> >>
>> >> diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
>> >> index 2b28168..d98ddcf 100644
>> >> --- a/drivers/mmc/host/omap.c
>> >> +++ b/drivers/mmc/host/omap.c
>> >> @@ -1157,7 +1157,6 @@ static void mmc_omap_start_request(struct mmc_omap_host *host,
>> >> __ __ __ mmc_omap_start_command(host, req->cmd);
>> >> __ __ __ if (host->dma_in_use)
>> >> __ __ __ __ __ __ __ omap_start_dma(host->dma_ch);
>> >> - __ __ BUG_ON(irqs_disabled());
>> >> __}
>> >>
>> >> __static void mmc_omap_request(struct mmc_host *mmc, struct mmc_request *req)
>> >
>> > So we need to decide whether this should be backported into 2.6.34.x
>> > and perhaps earlier.
>> >
>> > For that decision we'll need to know the things you didn't tell us:
>> > Which drivers are affected? __Under which setups is it triggering? __Why
>> > aren't lots of people reporting "hey my kernel went BUG"?
>> >
>> >
>>
>> The only setup I've managed to make it trigger on is on the HTC Herald
>> during bootup when the driver is built into the kernel (mostly because
>> that's all I have). I believe it's related to the fact that on bootup
>> I get many timeout errors on "CMD5" while initializing the card. Each
>> CMD5 timeout triggers that bug (I changed it to a WARN_ON to get it to
>> boot in) due to the fact that part of the timeout code involves
>> sending the request again. With interrupts turned off, that BUG would
>> be triggered.
>>
>> I can't answer the question of why other people aren't reporting this
>> -- I know the CMD timeouts are fairly common with this driver, and
>> it's only within the last few kernel releases that their triggering
>> the BUG started happening. (I had only been able to test it because I
>> was carrying forward the MMC 16-bit patch I submitted a while ago
>> which only recently made it in. I'm not sure if that's related or
>> not, but I need that to use the MMC-OMAP on herald.)
>
> Do you have one of these BUG_ON() traces handy, so we can perhaps see
> where local interrupts got disabled?
>
>> I imagine a better solution to this would be to fix the timeout issues
>> so the repeated requests aren't a problem. But any hardware bugs that
>> cause a timeout during boot would cause this bug to be triggered,
>> which is why I'm proposing removing the BUG_ON entirely (since
>> everything seems to work fine anyway).
>>
>> I don't know why interrupts are disabled at this point, but my limited
>> googling around leads me to believe the recent LOCKDEP work may be the
>> cause. I couldn't find enough information on that to know for sure
>> though. I do know that the bug no longer triggers after the card
>> initializes successfully (and presumably interrupts re-enable).
>>
>> My guess is that since other people aren't reporting this problem,
>> it's not hugely important to backport. A better question in that case
>> would be why am I seeing it? I don't understand why interrupts would
>> be disabled at this point in bootup.
>>
>
> Yes, before removing the BUG_ON() it would be most helpful to
> understand why it was added.
>
> It was added by
>
> : commit abfbe5f7854a083ca324282bf7e39f10bc438313
> : Author: Juha Yrjola <juha.yrjola@xxxxxxxxxxxxx>
> : AuthorDate: Wed Mar 26 16:08:57 2008 -0400
> : Commit: Pierre Ossman <drzeus@xxxxxxxxx>
> : CommitDate: Fri Apr 18 20:05:28 2008 +0200
> :
> : MMC: OMAP: Introduce new multislot structure and change driver to use it
> :
> : Introduce new MMC multislot structure and change driver to use it.
> :
> : Note that MMC clocking is now enabled in mmc_omap_select_slot()
> : and disabled in mmc_omap_release_slot().
> :
> : Signed-off-by: Juha Yrjola <juha.yrjola@xxxxxxxxxxxxx>
> : Signed-off-by: Jarkko Lavinen <jarkko.lavinen@xxxxxxxxx>
> : Signed-off-by: Carlos Eduardo Aguiar <carlos.aguiar@xxxxxxxxxxx>
> : Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
> : Signed-off-by: Pierre Ossman <drzeus@xxxxxxxxx>
>
> Hopefully the email still works.. Juha, do you recall why you added
> the BUG_ON(irqs_disabled()) to mmc_omap_start_request()?
>
I can only get the last screenful of output from the BUG, since I
don't have serial debugging capabilities:
Exception stack(0xc3c25d20 to 0xc3c25d68)
5d20: 00000032 c02ac86a c3c25d5c 00000000 c32a9a00 00000000 c3c77f0c 00000005
5d40: 00000001 00000000 00000001 c3c43878 00000000 c3c25d68 c0028be0 c0028be4
5d60: 60000093 ffffffff
[<c0025a28>] (__dabt_svc+0x48/0x60) from [<c0028be4]> (__bug+0x18/0x24)
[<c0028be4>] (__bug+0x18/0x24) from [<c01963bc>]
(mmc_omap_start_request+0x358/0x38c)
[<c01963bc>] (mmc_omap_start_request+0x358/0x38c) from [<c018e948>]
(mmc_request_done+0x6c/0xa8)
[<c018e948>] (mmc_request_done+0x6c/0xa8) from [<c0196e38>]
(mmc_omap_irq+0x2f4/0x3b0)
[<c0196e38>] (mmc_omap_irq+0x2f4/0x3b0) from [<c0063efc>]
(handle_IRQ_event+0x24/0xec)
[<c0064efc>] (handle_IRQ_event+0x24/0xec) from [<c0066054>]
(handle_level_irq+0xdc/0x188)
[<c0066054>] (handle_level_irq+0xdc/0x188) from [<c0025068>]
(asm_do_IRQ+0x68/0x88)
[<c0025068>] (asm_do_IRQ+0x68/0x88) from [<c0025a78>] (__irq_svc+0x38/0xa8)
Exception stack(0xc3c25e08 to 0xc3c25e50)
5e00: 00000001 fffffff9 c0319ac8 fffffffb 80000013 c3c43800
5e20: 00000002 c3cc25f30 00000002 00000001 00000002 c3c43878 0000001f c3c25e50
5e40: c002f540 c0031370 60000013 ffffffff
[<c0025a78>] (__irq_svc+0x38/0xa8) from [<c0031370>] (clk_disable+0x7c/0xb4)
[<c0031370>] (clk_disable+0x7c/0xb4) from [<c018b45c>] (omap_i2c_idle+0xb8/0xcc)
[<c018b45c>] (omap_i2c_idle+0xb8/0xcc) from [<c018b7e0>]
(omap_i2c_xfer+0x370/0x3a8)
[<c018b7e0>] (omap_i2c_xfer+0x370/0x3a8) from [<c0187fa4>]
(i2c_transfer+0x9c/0xf4)
[<c0187fa4>] (i2c_transfer+0x9c/0xf4) from [<c01883e8>]
(i2c_smbus_xfer+0x3ec/0x52c)
[<c01883e8>] (i2c_smbus_xfer+0x3ec/0x52c) from [<c01887e8>]
(i2c_smbus_read_byte_data+0x34/0x44)
[<c01887e8>] (i2c_smbus_read_byte_data+0x34/0x44) from [<c004c118>]
(worker_thread+0x180/0x244)
[<c004c118>] (worker_thread+0x180/0x244) from [<c004f4cc>] (kthread+0x78/0x80)
[<c004f4cc>] (kthread+0x78/0x80) from [<c00268e4>] (kernel_thread_exit+0x0/0x8)
If I replace BUG_ON with WARN_ON, I can get the whole dmesg output,
which contains much the same information (but also the rest of it).
I've attached that here.
- Cory
Linux version 2.6.34-08342-g4eab418-dirty (darkstar62@runt) (gcc version 4.4.1 (Sourcery G++ Lite 2009q3-68) ) #13 PREEMPT Wed Jun 2 17:00:17 PDT 2010
CPU: ARM926EJ-S [41069263] revision 3 (ARMv5TEJ), cr=00053177
CPU: VIVT data cache, VIVT instruction cache
Machine: HTC Herald
Memory policy: ECC disabled, Data cache writethrough
On node 0 totalpages: 16384
free_area_init_node: node 0, pgdat c0319010, node_mem_map c0330000
Normal zone: 128 pages used for memmap
Normal zone: 0 pages reserved
Normal zone: 16256 pages, LIFO batch:3
OMAP0850
revision 1 handled as 07xx id: 0000000000000000
SRAM: Mapped pa 0x20000000 to va 0xd8000000 size: 0x100000
Timeout waiting for end of frame -- LCD may not be available
htcherald_map_io done.
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
Kernel command line: init=/sbin/init console=tty0 video=omapfb:accel fbcon=rotate:3 gsm-wizard.noreset=1 gsm-wizard.noload=1 android:rotate_ccw 3
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 57576k/57576k available, 7960k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
vmalloc : 0xc4800000 - 0xd8000000 ( 312 MB)
lowmem : 0xc0000000 - 0xc4000000 ( 64 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc0025000 ( 116 kB)
.text : 0xc0025000 - 0xc02e3000 (2808 kB)
.data : 0xc02fa000 - 0xc0319620 ( 126 kB)
Hierarchical RCU implementation.
RCU-based detection of stalled CPUs is disabled.
Verbose stalled-CPUs detection is disabled.
NR_IRQS:432
htcherald_init_irq.
Clocks: ARM_SYSST: 0x1040 DPLL_CTL: 0x2fb3 ARM_CKCTL: 0x6506
Clocking rate (xtal/DPLL1/MPU): 13.0/195.0/0.0 MHz
Total of 96 interrupts in 3 interrupt banks
Console: colour dummy device 80x30
console [tty0] enabled
Calibrating delay loop... 97.07 BogoMIPS (lpj=485376)
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
HTC Herald init.
OMAP850 Watchdog seems to be activated, disabling it for now.
USB setup complete.
USB: hmc 4, usb2 alt 0 wires
OMAP DMA hardware version 1
DMA capabilities: 000c0000:00000000:01ff:003f:007f
bio: create slab <bio-0> at 0
i2c_omap i2c_omap.1: bus 1 rev2.2 at 100 kHz
Bluetooth: Core ver 2.15
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Switching to clocksource mpu_timer2
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
NET: Registered protocol family 1
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Unpacking initramfs...
Freeing initrd memory: 4120K
Power Management for TI OMAP.
msgmni has been set to 120
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
omapfb: configured for panel lcd_herald
omapfb: LCDC initialized
Console: switching to colour frame buffer device 80x40
omapfb: Framebuffer initialized. Total vram 155648 planes 1
omapfb: Pixclock 5735 kHz hfreq 20.1 kHz vfreq 62.6 Hz
Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO 0xfffb0000 (irq = 47) is a ST16654
serial8250.0: ttyS1 at MMIO 0xfffb0800 (irq = 46) is a ST16654
serial8250 serial8250.0: unable to register port at index 2 (IO0 MEM0 IRQ15): -28
loop: module loaded
i2c-htcpld i2c-htcpld: Registered chip at 0x3
i2c-htcpld i2c-htcpld: Registered chip at 0x4
i2c-htcpld i2c-htcpld: Registered chip at 0x5
i2c-htcpld i2c-htcpld: Registered chip at 0x6
i2c-htcpld i2c-htcpld: Initialized successfully
udc: OMAP UDC driver, version: 4 October 2004 (iso)
udc: OMAP UDC rev 3.6
udc: hmc mode 4, integrated transceiver
udc: fifo mode 3, 648 bytes not used
g_ether gadget: using random self ethernet address
g_ether gadget: using random host ethernet address
usb0: MAC 5e:8d:55:2a:95:74
usb0: HOST MAC 3a:e2:88:39:ef:2b
g_ether gadget: Ethernet Gadget, version: Memorial Day 2008
g_ether gadget: g_ether ready
mice: PS/2 mouse device common for all mice
input: gpio-keys as /devices/platform/gpio-keys/input/input0
OMAP Keypad Driver
input: omap-keypad as /devices/platform/omap-keypad/input/input1
ads7846 spi2.1: touchscreen, irq 236
input: ADS7846 Touchscreen as /devices/platform/omap1_spi100k.2/spi2.1/input/input2
i2c /dev entries driver
Bluetooth: HCI UART driver ver 2.2
Bluetooth: HCILL protocol initialized
Registered led device: dpad
Registered led device: kbd
Registered led device: vibrate
Registered led device: green_solid
Registered led device: green_flash
Registered led device: red_solid
Registered led device: red_flash
Registered led device: wifi
Registered led device: bt
Registered led device: caps
Registered led device: alt
TCP cubic registered
NET: Registered protocol family 17
mmci-omap mmci-omap.0: command timeout (CMD52)
Bluetooth: L2CAP ver 2.14
mmci-omap mmci-omap.0: command timeout (CMD52)
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO (Voice Link) ver 0.6
Bluetooth: SCO socket layer initialized
Bluetooth: RFCOMM TTY layer initialized
udc: USB reset done, gadget g_ether
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM ver 1.11
Bluetooth: BNEP (Ethernet Emulation) ver 1.3
Bluetooth: BNEP filters: protocol multicast
Bluetooth: HIDP (Human Interface Emulation) ver 1.2
mmci-omap mmci-omap.0: command timeout (CMD5)
------------[ cut here ]------------
WARNING: at drivers/mmc/host/omap.c:1160 mmc_omap_start_request+0x354/0x388()
Modules linked in:
[<c002a280>] (unwind_backtrace+0x0/0xec) from [<c0039d94>] (warn_slowpath_common+0x48/0x60)
[<c0039d94>] (warn_slowpath_common+0x48/0x60) from [<c0039dc4>] (warn_slowpath_null+0x18/0x1c)
[<c0039dc4>] (warn_slowpath_null+0x18/0x1c) from [<c01963b8>] (mmc_omap_start_request+0x354/0x388)
[<c01963b8>] (mmc_omap_start_request+0x354/0x388) from [<c018e948>] (mmc_request_done+0x6c/0xa8)
[<c018e948>] (mmc_request_done+0x6c/0xa8) from [<c0196e34>] (mmc_omap_irq+0x2f4/0x3b0)
[<c0196e34>] (mmc_omap_irq+0x2f4/0x3b0) from [<c0063efc>] (handle_IRQ_event+0x24/0xec)
[<c0063efc>] (handle_IRQ_event+0x24/0xec) from [<c0066054>] (handle_level_irq+0xdc/0x188)
[<c0066054>] (handle_level_irq+0xdc/0x188) from [<c0025068>] (asm_do_IRQ+0x68/0x88)
[<c0025068>] (asm_do_IRQ+0x68/0x88) from [<c0025a78>] (__irq_svc+0x38/0xa8)
Exception stack(0xc3c25e08 to 0xc3c25e50)
5e00: 00000001 fffffff9 c0319ac8 fffffffb 80000013 c3c2d800
5e20: 00000002 c3c25f30 00000002 00000001 00000002 c3c2d878 0000001f c3c25e50
5e40: c002f540 c0031370 60000013 ffffffff
[<c0025a78>] (__irq_svc+0x38/0xa8) from [<c0031370>] (clk_disable+0x7c/0xb4)
[<c0031370>] (clk_disable+0x7c/0xb4) from [<c018b45c>] (omap_i2c_idle+0xb8/0xcc)
[<c018b45c>] (omap_i2c_idle+0xb8/0xcc) from [<c018b7e0>] (omap_i2c_xfer+0x370/0x3a8)
[<c018b7e0>] (omap_i2c_xfer+0x370/0x3a8) from [<c0187fa4>] (i2c_transfer+0x9c/0xf4)
[<c0187fa4>] (i2c_transfer+0x9c/0xf4) from [<c01883e8>] (i2c_smbus_xfer+0x3ec/0x52c)
[<c01883e8>] (i2c_smbus_xfer+0x3ec/0x52c) from [<c01887e8>] (i2c_smbus_read_byte_data+0x34/0x44)
[<c01887e8>] (i2c_smbus_read_byte_data+0x34/0x44) from [<c004c118>] (worker_thread+0x180/0x244)
[<c004c118>] (worker_thread+0x180/0x244) from [<c004f4cc>] (kthread+0x78/0x80)
[<c004f4cc>] (kthread+0x78/0x80) from [<c00268e4>] (kernel_thread_exit+0x0/0x8)
---[ end trace 7a5aada48eab534b ]---
mmci-omap mmci-omap.0: command timeout (CMD5)
------------[ cut here ]------------
WARNING: at drivers/mmc/host/omap.c:1160 mmc_omap_start_request+0x354/0x388()
Modules linked in:
[<c002a280>] (unwind_backtrace+0x0/0xec) from [<c0039d94>] (warn_slowpath_common+0x48/0x60)
[<c0039d94>] (warn_slowpath_common+0x48/0x60) from [<c0039dc4>] (warn_slowpath_null+0x18/0x1c)
[<c0039dc4>] (warn_slowpath_null+0x18/0x1c) from [<c01963b8>] (mmc_omap_start_request+0x354/0x388)
[<c01963b8>] (mmc_omap_start_request+0x354/0x388) from [<c018e948>] (mmc_request_done+0x6c/0xa8)
[<c018e948>] (mmc_request_done+0x6c/0xa8) from [<c0196e34>] (mmc_omap_irq+0x2f4/0x3b0)
[<c0196e34>] (mmc_omap_irq+0x2f4/0x3b0) from [<c0063efc>] (handle_IRQ_event+0x24/0xec)
[<c0063efc>] (handle_IRQ_event+0x24/0xec) from [<c0066054>] (handle_level_irq+0xdc/0x188)
[<c0066054>] (handle_level_irq+0xdc/0x188) from [<c0025068>] (asm_do_IRQ+0x68/0x88)
[<c0025068>] (asm_do_IRQ+0x68/0x88) from [<c0025a78>] (__irq_svc+0x38/0xa8)
Exception stack(0xc3c25d80 to 0xc3c25dc8)
5d80: 3801fe31 00000000 00000003 20000013 c3c24000 00000202 00000000 00000002
5da0: 0000000a c3c24000 00000002 c3c2d878 c3c15350 c3c25dc8 c003f33c c003f234
5dc0: 20000013 ffffffff
[<c0025a78>] (__irq_svc+0x38/0xa8) from [<c003f234>] (__do_softirq+0x40/0x108)
[<c003f234>] (__do_softirq+0x40/0x108) from [<c003f33c>] (irq_exit+0x40/0x60)
[<c003f33c>] (irq_exit+0x40/0x60) from [<c002506c>] (asm_do_IRQ+0x6c/0x88)
[<c002506c>] (asm_do_IRQ+0x6c/0x88) from [<c0025a78>] (__irq_svc+0x38/0xa8)
Exception stack(0xc3c25e08 to 0xc3c25e50)
5e00: 00000001 fffffff9 c0319ac8 fffffffb 80000013 c3c2d800
5e20: 00000002 c3c25f30 00000002 00000001 00000002 c3c2d878 0000001f c3c25e50
5e40: c002f540 c0031370 60000013 ffffffff
[<c0025a78>] (__irq_svc+0x38/0xa8) from [<c0031370>] (clk_disable+0x7c/0xb4)
[<c0031370>] (clk_disable+0x7c/0xb4) from [<c018b45c>] (omap_i2c_idle+0xb8/0xcc)
[<c018b45c>] (omap_i2c_idle+0xb8/0xcc) from [<c018b7e0>] (omap_i2c_xfer+0x370/0x3a8)
[<c018b7e0>] (omap_i2c_xfer+0x370/0x3a8) from [<c0187fa4>] (i2c_transfer+0x9c/0xf4)
[<c0187fa4>] (i2c_transfer+0x9c/0xf4) from [<c01883e8>] (i2c_smbus_xfer+0x3ec/0x52c)
[<c01883e8>] (i2c_smbus_xfer+0x3ec/0x52c) from [<c01887e8>] (i2c_smbus_read_byte_data+0x34/0x44)
[<c01887e8>] (i2c_smbus_read_byte_data+0x34/0x44) from [<c004c118>] (worker_thread+0x180/0x244)
[<c004c118>] (worker_thread+0x180/0x244) from [<c004f4cc>] (kthread+0x78/0x80)
[<c004f4cc>] (kthread+0x78/0x80) from [<c00268e4>] (kernel_thread_exit+0x0/0x8)
---[ end trace 7a5aada48eab534c ]---
mmci-omap mmci-omap.0: command timeout (CMD5)
------------[ cut here ]------------
WARNING: at drivers/mmc/host/omap.c:1160 mmc_omap_start_request+0x354/0x388()
Modules linked in:
[<c002a280>] (unwind_backtrace+0x0/0xec) from [<c0039d94>] (warn_slowpath_common+0x48/0x60)
[<c0039d94>] (warn_slowpath_common+0x48/0x60) from [<c0039dc4>] (warn_slowpath_null+0x18/0x1c)
[<c0039dc4>] (warn_slowpath_null+0x18/0x1c) from [<c01963b8>] (mmc_omap_start_request+0x354/0x388)
[<c01963b8>] (mmc_omap_start_request+0x354/0x388) from [<c018e948>] (mmc_request_done+0x6c/0xa8)
[<c018e948>] (mmc_request_done+0x6c/0xa8) from [<c0196e34>] (mmc_omap_irq+0x2f4/0x3b0)
[<c0196e34>] (mmc_omap_irq+0x2f4/0x3b0) from [<c0063efc>] (handle_IRQ_event+0x24/0xec)
[<c0063efc>] (handle_IRQ_event+0x24/0xec) from [<c0066054>] (handle_level_irq+0xdc/0x188)
[<c0066054>] (handle_level_irq+0xdc/0x188) from [<c0025068>] (asm_do_IRQ+0x68/0x88)
[<c0025068>] (asm_do_IRQ+0x68/0x88) from [<c0025a78>] (__irq_svc+0x38/0xa8)
Exception stack(0xc3c25d80 to 0xc3c25dc8)
5d80: 3801fe31 00000000 00000003 20000013 c3c24000 00000202 00000000 00000002
5da0: 0000000a c3c24000 00000002 c3c2d878 c3c15350 c3c25dc8 c003f33c c003f234
5dc0: 20000013 ffffffff
[<c0025a78>] (__irq_svc+0x38/0xa8) from [<c003f234>] (__do_softirq+0x40/0x108)
[<c003f234>] (__do_softirq+0x40/0x108) from [<c003f33c>] (irq_exit+0x40/0x60)
[<c003f33c>] (irq_exit+0x40/0x60) from [<c002506c>] (asm_do_IRQ+0x6c/0x88)
[<c002506c>] (asm_do_IRQ+0x6c/0x88) from [<c0025a78>] (__irq_svc+0x38/0xa8)
Exception stack(0xc3c25e08 to 0xc3c25e50)
5e00: 00000001 fffffff9 c0319ac8 fffffffb 80000013 c3c2d800
5e20: 00000002 c3c25f30 00000002 00000001 00000002 c3c2d878 0000001f c3c25e50
5e40: c002f540 c0031370 60000013 ffffffff
[<c0025a78>] (__irq_svc+0x38/0xa8) from [<c0031370>] (clk_disable+0x7c/0xb4)
[<c0031370>] (clk_disable+0x7c/0xb4) from [<c018b45c>] (omap_i2c_idle+0xb8/0xcc)
[<c018b45c>] (omap_i2c_idle+0xb8/0xcc) from [<c018b7e0>] (omap_i2c_xfer+0x370/0x3a8)
[<c018b7e0>] (omap_i2c_xfer+0x370/0x3a8) from [<c0187fa4>] (i2c_transfer+0x9c/0xf4)
[<c0187fa4>] (i2c_transfer+0x9c/0xf4) from [<c01883e8>] (i2c_smbus_xfer+0x3ec/0x52c)
[<c01883e8>] (i2c_smbus_xfer+0x3ec/0x52c) from [<c01887e8>] (i2c_smbus_read_byte_data+0x34/0x44)
[<c01887e8>] (i2c_smbus_read_byte_data+0x34/0x44) from [<c004c118>] (worker_thread+0x180/0x244)
[<c004c118>] (worker_thread+0x180/0x244) from [<c004f4cc>] (kthread+0x78/0x80)
[<c004f4cc>] (kthread+0x78/0x80) from [<c00268e4>] (kernel_thread_exit+0x0/0x8)
---[ end trace 7a5aada48eab534d ]---
mmci-omap mmci-omap.0: command timeout (CMD5)
MUX: initialized UART_7XX_1
MUX: initialized UART_7XX_2
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SDHC card at address ede2
mmcblk0: mmc0:ede2 SU16G 14.8 GiB
mmcblk0: p1
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
Freeing init memory: 116K
EXT2-fs (loop0): warning: maximal mount count reached, running e2fsck is recommended
udc: USB reset done, gadget g_ether
udc: USB reset done, gadget g_ether
g_ether gadget: full speed config #1: CDC Ethernet (ECM)
