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Enric Balletbo i Serra db7515783b pinctrl: mediatek: Free eint data on failure 
The pinctrl driver can work without the EINT resource, but, if it is
expected to have this resource but the mtk_build_eint() function fails
after allocating their data (because can't get the resource or can't map
the irq), the data is not freed and you end with a NULL pointer
dereference. Fix this by freeing the data if mtk_build_eint() fails, so
pinctrl still works and doesn't hang.

This is noticeable after commit f97dbf48ca ("irqchip/mtk-sysirq: Convert
to a platform driver") on MT8183 because, due this commit, the pinctrl driver
fails to map the irq and spots the following bug:

[    1.947597] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004
[    1.956404] Mem abort info:
[    1.959203]   ESR = 0x96000004
[    1.962259]   EC = 0x25: DABT (current EL), IL = 32 bits
[    1.967565]   SET = 0, FnV = 0
[    1.970613]   EA = 0, S1PTW = 0
[    1.973747] Data abort info:
[    1.976619]   ISV = 0, ISS = 0x00000004
[    1.980447]   CM = 0, WnR = 0
[    1.983410] [0000000000000004] user address but active_mm is swapper
[    1.989759] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[    1.995322] Modules linked in:
[    1.998371] CPU: 7 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc1+ #44
[    2.004715] Hardware name: MediaTek krane sku176 board (DT)
[    2.010280] pstate: 60000005 (nZCv daif -PAN -UAO BTYPE=--)
[    2.015850] pc : mtk_eint_set_debounce+0x48/0x1b8
[    2.020546] lr : mtk_eint_set_debounce+0x34/0x1b8
[    2.025239] sp : ffff80001008baa0
[    2.028544] x29: ffff80001008baa0 x28: ffff0000ff7ff790
[    2.033847] x27: ffff0000f9ec34b0 x26: ffff0000f9ec3480
[    2.039150] x25: ffff0000fa576410 x24: ffff0000fa502800
[    2.044453] x23: 0000000000001388 x22: ffff0000fa635f80
[    2.049755] x21: 0000000000000008 x20: 0000000000000000
[    2.055058] x19: 0000000000000071 x18: 0000000000000001
[    2.060360] x17: 0000000000000000 x16: 0000000000000000
[    2.065662] x15: ffff0000facc8470 x14: ffffffffffffffff
[    2.070965] x13: 0000000000000001 x12: 00000000000000c0
[    2.076267] x11: 0000000000000040 x10: 0000000000000070
[    2.081569] x9 : ffffaec0063d24d8 x8 : ffff0000fa800270
[    2.086872] x7 : 0000000000000000 x6 : 0000000000000011
[    2.092174] x5 : ffff0000fa800248 x4 : ffff0000fa800270
[    2.097476] x3 : ffff8000100c5000 x2 : 0000000000000000
[    2.102778] x1 : 0000000000000000 x0 : 0000000000000000
[    2.108081] Call trace:
[    2.110520]  mtk_eint_set_debounce+0x48/0x1b8
[    2.114870]  mtk_gpio_set_config+0x5c/0x78
[    2.118958]  gpiod_set_config+0x5c/0x78
[    2.122786]  gpiod_set_debounce+0x18/0x28
[    2.126789]  gpio_keys_probe+0x50c/0x910
[    2.130705]  platform_drv_probe+0x54/0xa8
[    2.134705]  really_probe+0xe4/0x3b0
[    2.138271]  driver_probe_device+0x58/0xb8
[    2.142358]  device_driver_attach+0x74/0x80
[    2.146532]  __driver_attach+0x58/0xe0
[    2.150274]  bus_for_each_dev+0x70/0xc0
[    2.154100]  driver_attach+0x24/0x30
[    2.157666]  bus_add_driver+0x14c/0x1f0
[    2.161493]  driver_register+0x64/0x120
[    2.165319]  __platform_driver_register+0x48/0x58
[    2.170017]  gpio_keys_init+0x1c/0x28
[    2.173672]  do_one_initcall+0x54/0x1b4
[    2.177499]  kernel_init_freeable+0x1d0/0x238
[    2.181848]  kernel_init+0x14/0x118
[    2.185328]  ret_from_fork+0x10/0x34
[    2.188899] Code: a9438ac1 12001266 f94006c3 121e766a (b9400421)
[    2.194991] ---[ end trace 168cf7b3324b6570 ]---
[    2.199611] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    2.207260] SMP: stopping secondary CPUs
[    2.211294] Kernel Offset: 0x2ebff4800000 from 0xffff800010000000
[    2.217377] PHYS_OFFSET: 0xffffb50500000000
[    2.221551] CPU features: 0x0240002,2188200c
[    2.225811] Memory Limit: none
[    2.228860] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---

Fixes: 89132dd8ff ("pinctrl: mediatek: extend eint build to pinctrl-mtk-common-v2.c")
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Sean Wang <sean.wang@kernel.org>
Link: https://lore.kernel.org/r/20201001142511.3560143-1-enric.balletbo@collabora.com
[rebased on changed infrastructure]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2020-10-07 10:31:30 +02:00
arch pinctrl: armada-37xx: Add comment for pcie1_reset pin group 2020-08-27 10:25:17 +02:00
block block-5.9-2020-08-14 2020-08-15 20:36:42 -07:00
certs .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2020-08-14 13:09:15 -07:00
Documentation pinctrl: Document pinctrl-single,pins when #pinctrl-cells = 2 2020-09-30 11:41:15 +02:00
drivers pinctrl: mediatek: Free eint data on failure 2020-10-07 10:31:30 +02:00
fs io_uring-5.9-2020-08-15 2020-08-16 10:55:12 -07:00
include dt-bindings: pinctrl: mt8192: add pinctrl file 2020-08-27 10:50:49 +02:00
init OpenRISC updates for 5.9 2020-08-14 14:04:53 -07:00
ipc ipc/shm.c: remove the superfluous break 2020-08-12 10:58:02 -07:00
kernel io_uring-5.9-2020-08-15 2020-08-16 10:55:12 -07:00
lib iomap: constify ioreadX() iomem argument (as in generic implementation) 2020-08-14 19:56:57 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm Merge branch 'akpm' (patches from Andrew) 2020-08-15 08:02:03 -07:00
net 9p pull request for inclusion in 5.9 2020-08-15 08:34:36 -07:00
samples Kbuild updates for v5.9 2020-08-09 14:10:26 -07:00
scripts Kconfig updates for v5.9 2020-08-14 11:04:45 -07:00
security Merge branch 'akpm' (patches from Andrew) 2020-08-12 11:24:12 -07:00
sound sound fixes for 5.9-rc1 2020-08-14 15:58:57 -07:00
tools Cleanup, SECCOMP_FILTER support, message printing fixes, and other 2020-08-15 18:50:32 -07:00
usr Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
virt Merge branch 'akpm' (patches from Andrew) 2020-08-12 11:24:12 -07:00
.clang-format block: add bio_for_each_bvec_all() 2020-05-25 11:25:24 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: Add ZSTD-compressed files 2020-07-31 11:50:49 +02:00
.mailmap mailmap: add entry for Greg Kurz 2020-08-14 19:56:56 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS CREDITS: Replace HTTP links with HTTPS ones 2020-07-23 14:53:58 -06:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS pinctrl: renesas: Updates for v5.10 2020-09-21 23:43:30 +02:00
Makefile Linux 5.9-rc1 2020-08-16 13:04:57 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -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.

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.