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Noralf Trønnes 9e9435bc0b fbdev: fbcon: Fix unregister crash when more than one framebuffer 
[ Upstream commit 2122b40580 ]

When unregistering fbdev using unregister_framebuffer(), any bound
console will unbind automatically. This is working fine if this is the
only framebuffer, resulting in a switch to the dummy console. However if
there is a fb0 and I unregister fb1 having a bound console, I eventually
get a crash. The fastest way for me to trigger the crash is to do a
reboot, resulting in this splat:

[   76.478825] WARNING: CPU: 0 PID: 527 at linux/kernel/workqueue.c:1442 __queue_work+0x2d4/0x41c
[   76.478849] Modules linked in: raspberrypi_hwmon gpio_backlight backlight bcm2835_rng rng_core [last unloaded: tinydrm]
[   76.478916] CPU: 0 PID: 527 Comm: systemd-udevd Not tainted 4.20.0-rc4+ #4
[   76.478933] Hardware name: BCM2835
[   76.478949] Backtrace:
[   76.478995] [<c010d388>] (dump_backtrace) from [<c010d670>] (show_stack+0x20/0x24)
[   76.479022]  r6:00000000 r5:c0bc73be r4:00000000 r3:6fb5bf81
[   76.479060] [<c010d650>] (show_stack) from [<c08e82f4>] (dump_stack+0x20/0x28)
[   76.479102] [<c08e82d4>] (dump_stack) from [<c0120070>] (__warn+0xec/0x12c)
[   76.479134] [<c011ff84>] (__warn) from [<c01201e4>] (warn_slowpath_null+0x4c/0x58)
[   76.479165]  r9:c0eb6944 r8:00000001 r7:c0e927f8 r6:c0bc73be r5:000005a2 r4:c0139e84
[   76.479197] [<c0120198>] (warn_slowpath_null) from [<c0139e84>] (__queue_work+0x2d4/0x41c)
[   76.479222]  r6:d7666a00 r5:c0e918ee r4:dbc4e700
[   76.479251] [<c0139bb0>] (__queue_work) from [<c013a02c>] (queue_work_on+0x60/0x88)
[   76.479281]  r10:c0496bf8 r9:00000100 r8:c0e92ae0 r7:00000001 r6:d9403700 r5:d7666a00
[   76.479298]  r4:20000113
[   76.479348] [<c0139fcc>] (queue_work_on) from [<c0496c28>] (cursor_timer_handler+0x30/0x54)
[   76.479374]  r7:d8a8fabc r6:c0e08088 r5:d8afdc5c r4:d8a8fabc
[   76.479413] [<c0496bf8>] (cursor_timer_handler) from [<c0178744>] (call_timer_fn+0x100/0x230)
[   76.479435]  r4:c0e9192f r3:d758a340
[   76.479465] [<c0178644>] (call_timer_fn) from [<c0178980>] (expire_timers+0x10c/0x12c)
[   76.479495]  r10:40000000 r9:c0e9192f r8:c0e92ae0 r7:d8afdccc r6:c0e19280 r5:c0496bf8
[   76.479513]  r4:d8a8fabc
[   76.479541] [<c0178874>] (expire_timers) from [<c0179630>] (run_timer_softirq+0xa8/0x184)
[   76.479570]  r9:00000001 r8:c0e19280 r7:00000000 r6:c0e08088 r5:c0e1a3e0 r4:c0e19280
[   76.479603] [<c0179588>] (run_timer_softirq) from [<c0102404>] (__do_softirq+0x1ac/0x3fc)
[   76.479632]  r10:c0e91680 r9:d8afc020 r8:0000000a r7:00000100 r6:00000001 r5:00000002
[   76.479650]  r4:c0eb65ec
[   76.479686] [<c0102258>] (__do_softirq) from [<c0124d10>] (irq_exit+0xe8/0x168)
[   76.479716]  r10:d8d1a9b0 r9:d8afc000 r8:00000001 r7:d949c000 r6:00000000 r5:c0e8b3f0
[   76.479734]  r4:00000000
[   76.479764] [<c0124c28>] (irq_exit) from [<c016b72c>] (__handle_domain_irq+0x94/0xb0)
[   76.479793] [<c016b698>] (__handle_domain_irq) from [<c01021dc>] (bcm2835_handle_irq+0x3c/0x48)
[   76.479823]  r8:d8afdebc r7:d8afddfc r6:ffffffff r5:c0e089f8 r4:d8afddc8 r3:d8afddc8
[   76.479851] [<c01021a0>] (bcm2835_handle_irq) from [<c01019f0>] (__irq_svc+0x70/0x98)

The problem is in the console rebinding in fbcon_fb_unbind(). It uses the
virtual console index as the new framebuffer index to bind the console(s)
to. The correct way is to use the con2fb_map lookup table to find the
framebuffer index.

Fixes: cfafca8067 ("fbdev: fbcon: console unregistration from unregister_framebuffer")
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-02-12 19:47:15 +01:00
arch powerpc/powernv/ioda: Allocate indirect TCE levels of cached userspace addresses on demand 2019-02-12 19:47:14 +01:00
block block: use rcu_work instead of call_rcu to avoid sleep in softirq 2019-01-22 21:40:35 +01:00
certs export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR() 2018-08-22 23:21:44 +09:00
crypto crypto: aes_ti - disable interrupts while accessing S-box 2019-02-12 19:46:58 +01:00
Documentation mm, proc: be more verbose about unstable VMA flags in /proc/<pid>/smaps 2019-01-26 09:32:44 +01:00
drivers fbdev: fbcon: Fix unregister crash when more than one framebuffer 2019-02-12 19:47:15 +01:00
firmware kbuild: remove all dummy assignments to obj- 2017-11-18 11:46:06 +09:00
fs btrfs: use tagged writepage to mitigate livelock of snapshot 2019-02-12 19:47:11 +01:00
include drbd: Avoid Clang warning about pointless switch statment 2019-02-12 19:47:14 +01:00
init kbuild: Disable LD_DEAD_CODE_DATA_ELIMINATION with ftrace & GCC <= 4.7 2019-01-22 21:40:34 +01:00
ipc ipc/shm.c: use ERR_CAST() for shm_lock() error return 2018-10-05 16:32:04 -07:00
kernel kobject: return error code if writing /sys/.../uevent fails 2019-02-12 19:47:06 +01:00
lib fix int_sqrt64() for very large numbers 2019-01-22 21:40:34 +01:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm percpu: convert spin_lock_irq to spin_lock_irqsave. 2019-02-12 19:47:12 +01:00
net xfrm6_tunnel: Fix spi check in __xfrm6_tunnel_alloc_spi 2019-02-12 19:47:13 +01:00
samples livepatch: check kzalloc return values 2019-02-12 19:47:12 +01:00
scripts modpost: validate symbol names also in find_elf_symbol 2019-02-12 19:47:01 +01:00
security smack: fix access permissions for keyring 2019-02-12 19:47:05 +01:00
sound ASoC: fsl: Fix SND_SOC_EUKREA_TLV320 build error on i.MX8M 2019-02-12 19:47:09 +01:00
tools perf tools: Cast off_t to s64 to avoid warning on bionic libc 2019-02-12 19:47:12 +01:00
usr initramfs: move gen_initramfs_list.sh from scripts/ to usr/ 2018-08-22 23:21:44 +09:00
virt arm64: KVM: Skip MMIO insn after emulation 2019-02-12 19:47:12 +01:00
.clang-format clang-format: Set IndentWrappedFunctionNames false 2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore Kbuild updates for v4.17 (2nd) 2018-04-15 17:21:30 -07:00
.mailmap libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS 9p: remove Ron Minnich from MAINTAINERS 2018-08-17 16:20:26 -07:00
Kbuild Kbuild updates for v4.15 2017-11-17 17:45:29 -08:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS MAINTAINERS: Add Sasha as a stable branch maintainer 2018-12-01 09:37:25 +01:00
Makefile Linux 4.19.20 2019-02-06 17:30:16 +01:00
README Docs: Added a pointer to the formatted docs to README 2018-03-21 09:02:53 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.