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Dmitry Baryshkov dd23c11136 dma: gpi: remove spurious unlock in gpi_ch_init 
[ Upstream commit 91d6a468e3 ]

gpi_ch_init() doesn't lock the ctrl_lock mutex, so there is no need to
unlock it too. Instead the mutex is handled by the function
gpi_alloc_chan_resources(), which properly locks and unlocks the mutex.

=====================================
WARNING: bad unlock balance detected!
6.3.0-rc5-00253-g99792582ded1-dirty #15 Not tainted
-------------------------------------
kworker/u16:0/9 is trying to release lock (&gpii->ctrl_lock) at:
[<ffffb99d04e1284c>] gpi_alloc_chan_resources+0x108/0x5bc
but there are no more locks to release!

other info that might help us debug this:
6 locks held by kworker/u16:0/9:
 #0: ffff575740010938 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x220/0x594
 #1: ffff80000809bdd0 (deferred_probe_work){+.+.}-{0:0}, at: process_one_work+0x220/0x594
 #2: ffff575740f2a0f8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x38/0x188
 #3: ffff57574b5570f8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x38/0x188
 #4: ffffb99d06a2f180 (of_dma_lock){+.+.}-{3:3}, at: of_dma_request_slave_channel+0x138/0x280
 #5: ffffb99d06a2ee20 (dma_list_mutex){+.+.}-{3:3}, at: dma_get_slave_channel+0x28/0x10c

stack backtrace:
CPU: 7 PID: 9 Comm: kworker/u16:0 Not tainted 6.3.0-rc5-00253-g99792582ded1-dirty #15
Hardware name: Google Pixel 3 (DT)
Workqueue: events_unbound deferred_probe_work_func
Call trace:
 dump_backtrace+0xa0/0xfc
 show_stack+0x18/0x24
 dump_stack_lvl+0x60/0xac
 dump_stack+0x18/0x24
 print_unlock_imbalance_bug+0x130/0x148
 lock_release+0x270/0x300
 __mutex_unlock_slowpath+0x48/0x2cc
 mutex_unlock+0x20/0x2c
 gpi_alloc_chan_resources+0x108/0x5bc
 dma_chan_get+0x84/0x188
 dma_get_slave_channel+0x5c/0x10c
 gpi_of_dma_xlate+0x110/0x1a0
 of_dma_request_slave_channel+0x174/0x280
 dma_request_chan+0x3c/0x2d4
 geni_i2c_probe+0x544/0x63c
 platform_probe+0x68/0xc4
 really_probe+0x148/0x2ac
 __driver_probe_device+0x78/0xe0
 driver_probe_device+0x3c/0x160
 __device_attach_driver+0xb8/0x138
 bus_for_each_drv+0x84/0xe0
 __device_attach+0x9c/0x188
 device_initial_probe+0x14/0x20
 bus_probe_device+0xac/0xb0
 device_add+0x60c/0x7d8
 of_device_add+0x44/0x60
 of_platform_device_create_pdata+0x90/0x124
 of_platform_bus_create+0x15c/0x3c8
 of_platform_populate+0x58/0xf8
 devm_of_platform_populate+0x58/0xbc
 geni_se_probe+0xf0/0x164
 platform_probe+0x68/0xc4
 really_probe+0x148/0x2ac
 __driver_probe_device+0x78/0xe0
 driver_probe_device+0x3c/0x160
 __device_attach_driver+0xb8/0x138
 bus_for_each_drv+0x84/0xe0
 __device_attach+0x9c/0x188
 device_initial_probe+0x14/0x20
 bus_probe_device+0xac/0xb0
 deferred_probe_work_func+0x8c/0xc8
 process_one_work+0x2bc/0x594
 worker_thread+0x228/0x438
 kthread+0x108/0x10c
 ret_from_fork+0x10/0x20

Fixes: 5d0c3533a1 ("dmaengine: qcom: Add GPI dma driver")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230409233355.453741-1-dmitry.baryshkov@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-05-11 23:00:38 +09:00
arch openrisc: Properly store r31 to pt_regs on unhandled exceptions 2023-05-11 23:00:37 +09:00
block blk-crypto: make blk_crypto_evict_key() more robust 2023-05-11 23:00:16 +09:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:22:01 +02:00
crypto crypto: drbg - Only fail when jent is unavailable in FIPS mode 2023-05-11 23:00:27 +09:00
Documentation riscv: Move early dtb mapping into the fixmap region 2023-05-01 08:23:24 +09:00
drivers dma: gpi: remove spurious unlock in gpi_ch_init 2023-05-11 23:00:38 +09:00
fs ext4: fix use-after-free read in ext4_find_extent for bigalloc + inline 2023-05-11 23:00:37 +09:00
include SUNRPC: remove the maximum number of retries in call_bind_status 2023-05-11 23:00:37 +09:00
init kbuild: Add CONFIG_PAHOLE_VERSION 2023-02-25 12:06:45 +01:00
io_uring io_uring: avoid null-ptr-deref in io_arm_poll_handler 2023-03-22 13:31:37 +01:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:28:45 +01:00
kernel timekeeping: Fix references to nonexistent ktime_get_fast_ns() 2023-05-11 23:00:37 +09:00
lib debugobject: Prevent init race with static objects 2023-05-11 23:00:25 +09:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm writeback, cgroup: fix null-ptr-deref write in bdi_split_work_to_wbs 2023-05-11 23:00:18 +09:00
net SUNRPC: remove the maximum number of retries in call_bind_status 2023-05-11 23:00:37 +09:00
samples samples: vfio-mdev: Fix missing pci_disable_device() in mdpy_fb_probe() 2022-12-31 13:14:31 +01:00
scripts scripts/gdb: raise error with reduced debugging information 2023-05-11 23:00:33 +09:00
security selinux: ensure av_permissions.h is built when needed 2023-05-11 23:00:19 +09:00
sound ASoC: fsl_mqs: move of_node_put() to the correct location 2023-05-11 23:00:33 +09:00
tools Revert "objtool: Support addition to set CFA base" 2023-05-11 23:00:35 +09:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:27:15 +01:00
virt KVM: fix memoryleak in kvm_init() 2023-03-17 08:49:04 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +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: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
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 counter: Internalize sysfs interface code 2023-04-20 12:13:55 +02:00
Makefile Linux 5.15.110 2023-05-01 08:23:24 +09:00
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.