following bug happens with n900 2.6.35 kernel:
[ 28.693756] BUG: sleeping function called from invalid context at
kernel/rwsem.c:21
[ 28.693786] in_atomic(): 1, irqs_disabled(): 128, pid: 706, name:
udisks-part-id
[ 28.693817] 1 lock held by udisks-part-id/706:
[ 28.693817] #0: (&(&musb->lock)->rlock){-.-...}, at: [<c0278590>]
musb_g_disconnect+0x90/0x148
[ 28.693908] irq event stamp: 1169
[ 28.693908] hardirqs last enabled at (1168): [<c00c4b3c>]
kmem_cache_alloc+0xd0/0x128
[ 28.693969] hardirqs last disabled at (1169): [<c002da34>]
__irq_svc+0x34/0xb4
[ 28.694000] softirqs last enabled at (0): [<c0054bcc>]
copy_process+0x304/0xe18
[ 28.694030] softirqs last disabled at (0): [<(null)>] (null)
[ 28.694091] [<c00326a0>] (unwind_backtrace+0x0/0xec) from [<c037e6b0>]
(down_read+0x20/0x5c)
[ 28.694152] [<c037e6b0>] (down_read+0x20/0x5c) from [<c0070770>]
(__blocking_notifier_call_chain+0x2c/0x5c)
[ 28.694183] [<c0070770>] (__blocking_notifier_call_chain+0x2c/0x5c) from
[<c00707b4>] (blocking_notifier_call_chain+0x14/0x18)
[ 28.694213] [<c00707b4>] (blocking_notifier_call_chain+0x14/0x18) from
[<c02784d8>] (musb_gadget_vbus_draw+0x38/0x60)
[ 28.694274] [<c02784d8>] (musb_gadget_vbus_draw+0x38/0x60) from [<c0276d10>]
(musb_interrupt+0xb08/0xcb0)
[ 28.694305] [<c0276d10>] (musb_interrupt+0xb08/0xcb0) from [<c0276f08>]
(generic_interrupt+0x50/0x68)
[ 28.694335] [<c0276f08>] (generic_interrupt+0x50/0x68) from [<c008fcf4>]
(handle_IRQ_event+0x24/0xe8)
[ 28.694396] [<c008fcf4>] (handle_IRQ_event+0x24/0xe8) from [<c0091924>]
(handle_level_irq+0xac/0x128)
[ 28.694427] [<c0091924>] (handle_level_irq+0xac/0x128) from [<c002d070>]
(asm_do_IRQ+0x70/0x90)
[ 28.694458] [<c002d070>] (asm_do_IRQ+0x70/0x90) from [<c002da4c>]
(__irq_svc+0x4c/0xb4)
[ 28.694488] Exception stack(0xcd835ed0 to 0xcd835f18)
[ 28.694519] 5ec0: cfc0a240 c8282000
0000006b 0000006b
[ 28.694549] 5ee0: cfc0a240 0000041a 00001000 00000000 c8282000 cd834000
c8282000 be80c464
[ 28.694580] 5f00: 00000c1e cd835f18 c00c333c c00c297c 80000013 ffffffff
[ 28.694610] [<c002da4c>] (__irq_svc+0x4c/0xb4) from [<c00c297c>]
(check_poison_obj+0x24/0x194)
[ 28.694641] [<c00c297c>] (check_poison_obj+0x24/0x194) from [<c00c333c>]
(cache_alloc_debugcheck_after+0x28/0x188)
[ 28.694671] [<c00c333c>] (cache_alloc_debugcheck_after+0x28/0x188) from
[<c00c4b54>] (kmem_cache_alloc+0xe8/0x128)
[ 28.694732] [<c00c4b54>] (kmem_cache_alloc+0xe8/0x128) from [<c00d79dc>]
(getname+0x18/0xcc)
[ 28.694763] [<c00d79dc>] (getname+0x18/0xcc) from [<c00cbca8>]
(do_sys_open+0x18/0x10c)
[ 28.694793] [<c00cbca8>] (do_sys_open+0x18/0x10c) from [<c002df40>]
(ret_fast_syscall+0x0/0x3c)
[ 28.694854]
[ 28.694854] =================================
[ 28.709014] [ INFO: inconsistent lock state ]
[ 28.717254] 2.6.35.96.5-adaptation-n900 #1
[ 28.725128] ---------------------------------
[ 28.733123] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-R} usage.
[ 28.742980] udisks-part-id/706 [HC1[1]:SC0[0]:HE0:SE1] takes:
[ 28.752441] (&(&twl->otg.notifier)->rwsem){+-+...}, at: [<c0070770>]
__blocking_notifier_call_chain+0x2c/0x5c
[ 28.769836] {HARDIRQ-ON-W} state was registered at:
[ 28.778320] [<c007c1dc>] __lock_acquire+0x618/0x1730
[ 28.787109] [<c007d354>] lock_acquire+0x60/0x74
[ 28.795227] [<c037e67c>] down_write+0x48/0x5c
[ 28.803131] [<c00708a8>] blocking_notifier_chain_register+0x30/0x54
[ 28.812896] [<bf0da9f8>] isp1704_charger_probe+0x268/0x39c
[isp1704_charger]
[ 28.823394] [<c0239410>] platform_drv_probe+0x18/0x1c
[ 28.831787] [<c02385c8>] driver_probe_device+0xa8/0x158
[ 28.840332] [<c02386e0>] __driver_attach+0x68/0x8c
[ 28.848510] [<c0237e68>] bus_for_each_dev+0x44/0x74
[ 28.856689] [<c02377c8>] bus_add_driver+0x9c/0x20c
[ 28.864746] [<c02389b0>] driver_register+0xa8/0x138
[ 28.872955] [<c002d340>] do_one_initcall+0x58/0x1ac
[ 28.881134] [<c0085cdc>] sys_init_module+0x90/0x1b0
[ 28.889343] [<c002df40>] ret_fast_syscall+0x0/0x3c
[ 28.897491] irq event stamp: 1169
[ 28.904083] hardirqs last enabled at (1168): [<c00c4b3c>]
kmem_cache_alloc+0xd0/0x128
[ 28.915557] hardirqs last disabled at (1169): [<c002da34>]
__irq_svc+0x34/0xb4
[ 28.926239] softirqs last enabled at (0): [<c0054bcc>]
copy_process+0x304/0xe18
[ 28.937194] softirqs last disabled at (0): [<(null)>] (null)
[ 28.946258]
[ 28.946258] other info that might help us debug this:
[ 28.959381] 1 lock held by udisks-part-id/706:
[ 28.967163] #0: (&(&musb->lock)->rlock){-.-...}, at: [<c0278590>]
musb_g_disconnect+0x90/0x148
[ 28.979705]
[ 28.979705] stack backtrace:
[ 28.990997] [<c00326a0>] (unwind_backtrace+0x0/0xec) from [<c007a39c>]
(print_usage_bug+0x170/0x1b4)
[ 29.007293] [<c007a39c>] (print_usage_bug+0x170/0x1b4) from [<c007a738>]
(mark_lock+0x358/0x628)
[ 29.019836] [<c007a738>] (mark_lock+0x358/0x628) from [<c007c118>]
(__lock_acquire+0x554/0x1730)
[ 29.032409] [<c007c118>] (__lock_acquire+0x554/0x1730) from [<c007d354>]
(lock_acquire+0x60/0x74)
[ 29.045166] [<c007d354>] (lock_acquire+0x60/0x74) from [<c037e6d8>]
(down_read+0x48/0x5c)
[ 29.057250] [<c037e6d8>] (down_read+0x48/0x5c) from [<c0070770>]
(__blocking_notifier_call_chain+0x2c/0x5c)
[ 29.074920] [<c0070770>] (__blocking_notifier_call_chain+0x2c/0x5c) from
[<c00707b4>] (blocking_notifier_call_chain+0x14/0x18)
[ 29.094573] [<c00707b4>] (blocking_notifier_call_chain+0x14/0x18) from
[<c02784d8>] (musb_gadget_vbus_draw+0x38/0x60)
[ 29.113891] [<c02784d8>] (musb_gadget_vbus_draw+0x38/0x60) from [<c0276d10>]
(musb_interrupt+0xb08/0xcb0)
[ 29.132629] [<c0276d10>] (musb_interrupt+0xb08/0xcb0) from [<c0276f08>]
(generic_interrupt+0x50/0x68)
[ 29.151580] [<c0276f08>] (generic_interrupt+0x50/0x68) from [<c008fcf4>]
(handle_IRQ_event+0x24/0xe8)
[ 29.171081] [<c008fcf4>] (handle_IRQ_event+0x24/0xe8) from [<c0091924>]
(handle_level_irq+0xac/0x128)
[ 29.190948] [<c0091924>] (handle_level_irq+0xac/0x128) from [<c002d070>]
(asm_do_IRQ+0x70/0x90)
[ 29.205291] [<c002d070>] (asm_do_IRQ+0x70/0x90) from [<c002da4c>]
(__irq_svc+0x4c/0xb4)
[ 29.218963] Exception stack(0xcd835ed0 to 0xcd835f18)
[ 29.229644] 5ec0: cfc0a240 c8282000
0000006b 0000006b
[ 29.243591] 5ee0: cfc0a240 0000041a 00001000 00000000 c8282000 cd834000
c8282000 be80c464
[ 29.257629] 5f00: 00000c1e cd835f18 c00c333c c00c297c 80000013 ffffffff
[ 29.270111] [<c002da4c>] (__irq_svc+0x4c/0xb4) from [<c00c297c>]
(check_poison_obj+0x24/0x194)
[ 29.284637] [<c00c297c>] (check_poison_obj+0x24/0x194) from [<c00c333c>]
(cache_alloc_debugcheck_after+0x28/0x188)
[ 29.306732] [<c00c333c>] (cache_alloc_debugcheck_after+0x28/0x188) from
[<c00c4b54>] (kmem_cache_alloc+0xe8/0x128)
[ 29.329071] [<c00c4b54>] (kmem_cache_alloc+0xe8/0x128) from [<c00d79dc>]
(getname+0x18/0xcc)
[ 29.343597] [<c00d79dc>] (getname+0x18/0xcc) from [<c00cbca8>]
(do_sys_open+0x18/0x10c)
[ 29.357696] [<c00cbca8>] (do_sys_open+0x18/0x10c) from [<c002df40>]
(ret_fast_syscall+0x0/0x3c)
Actually the blocking notifier chain runs in process context, so not fit for
use here.
Fix it as use atomic_notifier instead.
Signed-off-by: Yang Ruirui <[email protected]>
---
drivers/usb/musb/musb_gadget.c | 2 +-
drivers/usb/otg/twl4030-usb.c | 4 ++--
include/linux/usb/otg.h | 6 +++---
3 files changed, 6 insertions(+), 6 deletions(-)
--- linux-2.6.35.orig/drivers/usb/otg/twl4030-usb.c 2010-08-02
06:11:14.000000000 +0800
+++ linux-2.6.35/drivers/usb/otg/twl4030-usb.c 2011-01-19 16:50:44.729545246
+0800
@@ -494,7 +494,7 @@ static irqreturn_t twl4030_usb_irq(int i
else
twl4030_phy_resume(twl);
- blocking_notifier_call_chain(&twl->otg.notifier, status,
+ atomic_notifier_call_chain(&twl->otg.notifier, status,
twl->otg.gadget);
}
sysfs_notify(&twl->dev->kobj, NULL, "vbus");
@@ -585,7 +585,7 @@ static int __devinit twl4030_usb_probe(s
if (device_create_file(&pdev->dev, &dev_attr_vbus))
dev_warn(&pdev->dev, "could not create sysfs file\n");
- BLOCKING_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
+ ATOMIC_INIT_NOTIFIER_HEAD(&twl->otg.notifier);
/* Our job is to use irqs and status from the power module
* to keep the transceiver disabled when nothing's connected.
--- linux-2.6.35.orig/include/linux/usb/otg.h 2011-01-19 11:11:42.000000000
+0800
+++ linux-2.6.35/include/linux/usb/otg.h 2011-01-19 16:45:06.729546023
+0800
@@ -81,7 +81,7 @@ struct otg_transceiver {
void __iomem *io_priv;
/* for notification of usb_xceiv_events */
- struct blocking_notifier_head notifier;
+ struct atomic_notifier_head notifier;
/* to pass extra port status to the root hub */
u16 port_status;
@@ -241,13 +241,13 @@ otg_detect_charger(struct otg_transceive
static inline int
otg_register_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
{
- return blocking_notifier_chain_register(&otg->notifier, nb);
+ return atomic_notifier_chain_register(&otg->notifier, nb);
}
static inline void
otg_unregister_notifier(struct otg_transceiver *otg, struct notifier_block *nb)
{
- blocking_notifier_chain_unregister(&otg->notifier, nb);
+ atomic_notifier_chain_unregister(&otg->notifier, nb);
}
/* for OTG controller drivers (and maybe other stuff) */
--- linux-2.6.35.orig/drivers/usb/musb/musb_gadget.c 2011-01-19
16:42:48.000000000 +0800
+++ linux-2.6.35/drivers/usb/musb/musb_gadget.c 2011-01-19 16:46:41.096212474
+0800
@@ -1537,7 +1537,7 @@ static int musb_gadget_vbus_draw(struct
if (musb->power_draw != mA && mA > 0) {
musb->power_draw = mA;
- blocking_notifier_call_chain(&musb->xceiv->notifier,
+ atomic_notifier_call_chain(&musb->xceiv->notifier,
USB_EVENT_ENUMERATED,
&musb->power_draw);
}
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