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hujianyang ad233850c2 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 05:15:43 -07:00
..
chips - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
devices mtd: dataflash: Use of_match_ptr() macro 2013-04-05 13:19:51 +01:00
lpddr mtd: lpddr: replace open-coded ARRAY_SIZE with macro 2012-05-13 22:47:31 -05:00
maps - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
nand mtd: nand: omap: Fix 1-bit Hamming code scheme, omap_calculate_ecc() 2014-09-17 09:04:02 -07:00
onenand - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
tests Fairly unexciting MTD merge for 3.9: 2013-03-02 16:33:54 -08:00
ubi UBI: fix soft lockup in ubi_check_volume() 2015-05-13 05:15:43 -07:00
afs.c
ar7part.c mtd: Allow removal of partitioning modules 2013-02-04 09:27:33 +02:00
bcm47xxpart.c mtd: bcm47xxpart: look for NVRAM at the end of device 2013-03-08 11:36:00 +00:00
bcm63xxpart.c mtd: bcm63xxpart: use correct printk format for partitions 2012-11-21 17:15:06 +02:00
cmdlinepart.c mtd: Allow removal of partitioning modules 2013-02-04 09:27:33 +02:00
ftl.c mtd/ftl: fix the double free of the buffers allocated in build_maps() 2014-09-17 09:04:02 -07:00
inftlcore.c mtd: add leading underscore to all mtd functions 2012-03-27 00:20:01 +01:00
inftlmount.c
Kconfig mtd: merge mtdchar module with mtdcore 2013-04-05 13:16:54 +01:00
Makefile mtd: merge mtdchar module with mtdcore 2013-04-05 13:16:54 +01:00
mtd_blkdevs.c block_device_operations->release() should return void 2013-05-07 02:16:21 -04:00
mtdblock.c mtd_blktrans_ops->release() should return void 2013-05-05 21:31:22 -04:00
mtdblock_ro.c
mtdchar.c - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
mtdconcat.c mtd: unify initialization of erase_info->fail_addr 2012-03-27 01:02:24 +01:00
mtdcore.c - Lots of cleanups from Artem, including deletion of some obsolete drivers 2013-05-09 10:15:46 -07:00
mtdcore.h mtd: merge mtdchar module with mtdcore 2013-04-05 13:16:54 +01:00
mtdoops.c mtdoops: don't erase flash at each boot 2012-11-15 15:37:51 +02:00
mtdpart.c mtd: mtdcore: use const qualifier 2013-04-05 13:04:27 +01:00
mtdsuper.c VFS: Pass mount flags to sget() 2012-07-14 16:38:34 +04:00
mtdswap.c
nftlcore.c mtd: nftlcore: remove out-of-date and now irrelevant piece of code 2012-03-27 00:24:03 +01:00
nftlmount.c
ofpart.c mtd: ofpart: support partitions of 4 GiB and larger 2013-04-05 12:05:53 +01:00
redboot.c mtd: redboot: remove useless code 2012-03-27 00:24:14 +01:00
rfd_ftl.c
sm_ftl.c mtd: sm_ftl: heap corruption in sm_create_sysfs_attributes() 2014-05-13 13:59:45 +02:00
sm_ftl.h
ssfdc.c