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hujianyang 148ae97d28 UBI: fix soft lockup in ubi_check_volume() 
commit 9aa272b492 upstream.

Running mtd-utils/tests/ubi-tests/io_basic.c could cause
soft lockup or watchdog reset. It is because *updatevol*
will perform ubi_check_volume() after updating finish
and this function will full scan the updated lebs if the
volume is initialized as STATIC_VOLUME.

This patch adds *cond_resched()* in the loop of lebs scan
to avoid soft lockup.

Helped by Richard Weinberger <richard@nod.at>

[ 2158.067096] INFO: rcu_sched self-detected stall on CPU { 1}  (t=2101 jiffies g=1606 c=1605 q=56)
[ 2158.172867] CPU: 1 PID: 2073 Comm: io_basic Tainted: G           O 3.10.53 #21
[ 2158.172898] [<c000f624>] (unwind_backtrace+0x0/0x120) from [<c000c294>] (show_stack+0x10/0x14)
[ 2158.172918] [<c000c294>] (show_stack+0x10/0x14) from [<c008ac3c>] (rcu_check_callbacks+0x1c0/0x660)
[ 2158.172936] [<c008ac3c>] (rcu_check_callbacks+0x1c0/0x660) from [<c002b480>] (update_process_times+0x38/0x64)
[ 2158.172953] [<c002b480>] (update_process_times+0x38/0x64) from [<c005ff38>] (tick_sched_handle+0x54/0x60)
[ 2158.172966] [<c005ff38>] (tick_sched_handle+0x54/0x60) from [<c00601ac>] (tick_sched_timer+0x44/0x74)
[ 2158.172978] [<c00601ac>] (tick_sched_timer+0x44/0x74) from [<c003f348>] (__run_hrtimer+0xc8/0x1b8)
[ 2158.172992] [<c003f348>] (__run_hrtimer+0xc8/0x1b8) from [<c003fd9c>] (hrtimer_interrupt+0x128/0x2a4)
[ 2158.173007] [<c003fd9c>] (hrtimer_interrupt+0x128/0x2a4) from [<c0246f1c>] (arch_timer_handler_virt+0x28/0x30)
[ 2158.173022] [<c0246f1c>] (arch_timer_handler_virt+0x28/0x30) from [<c0086214>] (handle_percpu_devid_irq+0x9c/0x124)
[ 2158.173036] [<c0086214>] (handle_percpu_devid_irq+0x9c/0x124) from [<c0082bd8>] (generic_handle_irq+0x20/0x30)
[ 2158.173049] [<c0082bd8>] (generic_handle_irq+0x20/0x30) from [<c000969c>] (handle_IRQ+0x64/0x8c)
[ 2158.173060] [<c000969c>] (handle_IRQ+0x64/0x8c) from [<c0008544>] (gic_handle_irq+0x3c/0x60)
[ 2158.173074] [<c0008544>] (gic_handle_irq+0x3c/0x60) from [<c02f0f80>] (__irq_svc+0x40/0x50)
[ 2158.173083] Exception stack(0xc4043c98 to 0xc4043ce0)
[ 2158.173092] 3c80:                                                       c4043ce4 00000019
[ 2158.173102] 3ca0: 1f8a865f c050ad10 1f8a864c 00000031 c04b5970 0003ebce 00000000 f3550000
[ 2158.173113] 3cc0: bf00bc68 00000800 0003ebce c4043ce0 c0186d14 c0186cb8 80000013 ffffffff
[ 2158.173130] [<c02f0f80>] (__irq_svc+0x40/0x50) from [<c0186cb8>] (read_current_timer+0x4/0x38)
[ 2158.173145] [<c0186cb8>] (read_current_timer+0x4/0x38) from [<1f8a865f>] (0x1f8a865f)
[ 2183.927097] BUG: soft lockup - CPU#1 stuck for 22s! [io_basic:2073]
[ 2184.002229] Modules linked in: nandflash(O) [last unloaded: nandflash]

Signed-off-by: Wang Kai <morgan.wang@huawei.com>
Signed-off-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2015-05-13 05:17:00 -07:00
..
Kconfig UBI: Wire-up fastmap 2012-10-03 16:39:37 +03:00
Makefile UBI: Wire-up fastmap 2012-10-03 16:39:37 +03:00
attach.c UBI: account for bitflips in both the VID header and data 2015-05-06 21:59:16 +02:00
build.c UBI: fix error return code 2014-01-02 17:16:01 +02:00
cdev.c UBI: fix check for "too many bytes" 2015-05-06 21:59:16 +02:00
debug.c UBI: embed ubi_debug_info field in ubi_device struct 2012-12-10 13:38:59 +02:00
debug.h mtd: rename random32() to prandom_u32() 2013-02-04 09:26:28 +02:00
eba.c UBI: fix out of bounds write 2015-05-06 21:59:16 +02:00
fastmap.c UBI: add missing kmem_cache_free() in process_pool_aeb error path 2014-11-14 08:59:49 -08:00
gluebi.c UBI: gluebi: rename misleading variables 2012-11-30 13:54:41 +02:00
io.c UBI: avoid program operation on NOR flash after erasure interrupted 2014-01-09 18:25:38 +02:00
kapi.c UBI: modify ubi_wl_flush function to clear work queue for a lnum 2012-05-21 11:34:41 +03:00
misc.c UBI: fix soft lockup in ubi_check_volume() 2015-05-13 05:17:00 -07:00
ubi-media.h UBI: Add fastmap on-flash data structures 2012-10-03 12:29:37 +03:00
ubi.h UBI: embed ubi_debug_info field in ubi_device struct 2012-12-10 13:38:59 +02:00
upd.c UBI: Fix invalid vfree() 2015-01-16 06:59:30 -08:00
vmt.c UBI: introduce helpers dbg_chk_{io, gen} 2012-12-10 13:38:59 +02:00
vtbl.c UBI: introduce helpers dbg_chk_{io, gen} 2012-12-10 13:38:59 +02:00
wl.c UBI: initialize LEB number variable 2015-05-06 21:59:16 +02:00