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hujianyang f0958ab02d 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: Luis Henriques <luis.henriques@canonical.com>		History 2015-05-12 09:36:35 +01:00
..
attach.c	UBI: account for bitflips in both the VID header and data	2015-05-05 11:09:35 +01:00
block.c	This pull request contains several UBIFS fixes. One of them fixes a race	2014-06-10 08:55:46 -07:00
build.c	UBI: R/O block driver on top of UBI volumes	2014-02-28 16:29:48 +02:00
cdev.c	UBI: fix check for "too many bytes"	2015-05-05 11:09:36 +01:00
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	2015-05-05 11:09:35 +01:00
fastmap.c	UBI: add missing kmem_cache_free() in process_pool_aeb error path	2014-11-17 14:11:53 +00:00
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
Kconfig	UBI: block: Add CONFIG_BLOCK dependency	2014-03-04 14:49:53 +02:00
Makefile	UBI: R/O block driver on top of UBI volumes	2014-02-28 16:29:48 +02:00
misc.c	UBI: fix soft lockup in ubi_check_volume()	2015-05-12 09:36:35 +01:00
ubi-media.h	UBI: Add fastmap on-flash data structures	2012-10-03 12:29:37 +03:00
ubi.h	MTD updates for 3.15:	2014-04-07 10:17:30 -07:00
upd.c	UBI: Fix invalid vfree()	2015-01-05 13:48:37 +00:00
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	2015-05-05 11:09:36 +01:00