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Laurence de Bruxelles 9f9ba0b650 rtc: pxa: fix null pointer dereference 
commit 34127b3632 upstream.

With the latest stable kernel versions the rtc on the PXA based
Zaurus does not work, when booting I see the following kernel messages:

pxa-rtc pxa-rtc: failed to find rtc clock source
pxa-rtc pxa-rtc: Unable to init SA1100 RTC sub-device
pxa-rtc: probe of pxa-rtc failed with error -2
hctosys: unable to open rtc device (rtc0)

I think this is because commit f2997775b1 ("rtc: sa1100: fix possible
race condition") moved the allocation of the rtc_device struct out of
sa1100_rtc_init and into sa1100_rtc_probe. This means that pxa_rtc_probe
also needs to do allocation for the rtc_device struct, otherwise
sa1100_rtc_init will try to dereference a null pointer. This patch adds
that allocation by copying how sa1100_rtc_probe in
drivers/rtc/rtc-sa1100.c does it; after the IRQs are set up a managed
rtc_device is allocated.

I've tested this patch with `qemu-system-arm -machine akita` and with a
real Zaurus SL-C1000 applied to 4.19, 5.4, and 5.10.

Signed-off-by: Laurence de Bruxelles <lfdebrux@gmail.com>
Fixes: f2997775b1 ("rtc: sa1100: fix possible race condition")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220101154149.12026-1-lfdebrux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-01-27 09:04:33 +01:00
arch powerpc/fsl/dts: Enable WA for erratum A-009885 on fman3l MDIO buses 2022-01-27 09:04:32 +01:00
block block, bfq: fix use after free in bfq_bfqq_expire 2021-12-29 12:20:43 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-22 11:47:51 +02:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-26 11:36:11 +01:00
Documentation Documentation: refer to config RANDOMIZE_BASE for kernel address-space randomization 2022-01-27 09:04:32 +01:00
drivers rtc: pxa: fix null pointer dereference 2022-01-27 09:04:33 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs ext4: don't use the orphan list when migrating an inode 2022-01-27 09:04:31 +01:00
include ASoC: dpcm: prevent snd_soc_dpcm use after free 2022-01-27 09:04:31 +01:00
init pid: take a reference when initializing cad_pid 2021-06-10 13:24:06 +02:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-12-08 08:50:11 +01:00
kernel cputime, cpuacct: Include guest time in user time in cpuacct.stat 2022-01-27 09:04:30 +01:00
lib ARM: 8800/1: use choice for kernel unwinders 2021-12-22 09:19:03 +01:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm shmem: fix a race between shmem_unused_huge_shrink and shmem_evict_inode 2022-01-27 09:04:16 +01:00
net af_unix: annote lockless accesses to unix_tot_inflight & gc_in_progress 2022-01-27 09:04:32 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:36:11 +01:00
scripts recordmcount.pl: fix typo in s390 mcount regex 2022-01-05 12:34:58 +01:00
security selinux: initialize proto variable in selinux_ip_postroute_compat() 2022-01-05 12:34:58 +01:00
sound ASoC: dpcm: prevent snd_soc_dpcm use after free 2022-01-27 09:04:31 +01:00
tools selftests/net: udpgso_bench_tx: fix dst ip argument 2022-01-05 12:34:59 +01:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: remember position in kvm->vcpus array 2021-09-26 13:39:46 +02:00
.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 Documentation/llvm: add documentation on building w/ Clang/LLVM 2020-09-26 18:01:31 +02:00
Makefile kbuild: Add $(KBUILD_HOSTLDFLAGS) to 'has_libelf' test 2022-01-27 09:04:13 +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.