staging: rtl8712: get rid of flush_scheduled_work

This patch is preparation for following patch for error handling
refactoring.

flush_scheduled_work() takes (wq_completion)events lock and
it can lead to deadlock when r871xu_dev_remove() is called from workqueue.
To avoid deadlock sutiation we can change flush_scheduled_work() call to
flush_work() call for all possibly scheduled works in this driver,
since next patch adds device_release_driver() in case of fw load failure.

Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/6e028b4c457eeb7156c76c6ea3cdb3cb0207c7e1.1626895918.git.paskripkin@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: r8712_register_cmd_alive(): Change return values

Change return values of r8712_register_cmd_alive from _SUCCESS and _FAIL
to 0 and -EINVAL.
Change the return type of this function from sint to int.
Modify its call site to check for 0 instead of _SUCCESS.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com>
Link: https://lore.kernel.org/r/20190722092341.21030-4-nishkadg.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: rename bSurpriseRemoved to surprise_removed

- Rename structure field bSurprisedRemoved to surprised_removed to avoid
camelcase. Suggested by checkpatch.
- Change type to bool as the variable is used as a boolean.

Signed-off-by: Himadri Pandya <himadri18.07@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: rename bDriverStopped to driver_stopped

- Rename structure field bDriverStopped to driver_stopped to avoid
camelcase. Suggested by checkpatch.
- Change type to bool as the variable is being used as boolean.

Signed-off-by: Himadri Pandya <himadri18.07@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: add SPDX identifiers

This satisfies a checkpatch warning and is the preferred
method for notating the license.

The SPDX identifier is a legally binding shorthand, which
can be used instead of the full boiler plate text.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Florian Schilhabel <florian.c.schilhabel@googlemail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Tejaswini Poluri <tejaswinipoluri3@gmail.com>
Cc: Scott Matheina <scott@matheina.com>
Cc: Varsha Rao <rvarsha016@gmail.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Aleksey Kurbatov <alkbt@yandex.ru>
Cc: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
Cc: Wei Yongjun <weiyongjun1@huawei.com>
Cc: "Raphaël Beamonte" <raphael.beamonte@gmail.com>
Cc: Jannik Becher <becher.jannik@gmail.com>
Cc: Joseph Wright <rjosephwright@gmail.com>
Cc: devel@driverdev.osuosl.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: Fix coding style warnings on Block comments

Fixed checkpatch.pl warnings related to Block comments in
staging/rtl8712/*.c files.

Signed-off-by: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: fix double lock bug in SetPSModeWorkItemCallback()

Fix a double lock bug in SetPSModeWorkItemCallback().

Fixes: 5c2ba8b85e35 ("rtl8712: pwrctrl_priv: Replace semaphore lock with mutex")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: checkpatch cleanup: block comments using a trailing */

Fix checkpatch.pl warning "Block comments use a trailing */ on
a separate line" on multiple files of the driver by editing the
affected comments.

Signed-off-by: Raphaël Beamonte <raphael.beamonte@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

rtl8712: pwrctrl_priv: Replace semaphore lock with mutex

The semaphore 'lock' in 'pwrctrl_priv' is used as a simple mutex, so it
should be written as one. Semaphores are going away in the future.
_enter_pwrlock was using down_interruptible(), so the lock could be broken
by sending a signal. This could be a bug, because nothing checks the return
code here. Hence, using mutex_lock instead of the interruptible version.
Removing the now unused _enter_pwrlock and _down_sema.

Signed-off-by: Binoy Jayan <binoy.jayan@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

rtl8712: Replace semaphore cmd_queue_sema with completion

The semaphore 'cmd_queue_sema' is used as completion,
so convert it to a struct completion type.

Signed-off-by: Binoy Jayan <binoy.jayan@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: Remove boolean comparisons

Boolean tests do not need explicit comparison to true or false.

Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: fix stack dump

del_timer_sync() is not to be called in the interrupt context unless
the timer is irqsafe. but most of the functions where commits
6501c8e7d86cca5f and 382d020f4459cd77 touched were called in interrupt
context. And as a result the WARN_ON was getting triggered. Changed
to del_timer() in places which were called from interrupt.

Fixes: 382d020f4459cd77 ("Staging: rtl8712: Eliminate use of _cancel_timer"
Fixes: 6501c8e7d86cca5f ("Staging: rtl8712: Eliminate use of _cancel_timer_ex")
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=97711
Reported-by: Arek Rusniak <arek.rusi@gmail.com>
Tested-by: Arek Rusniak <arek.rusi@gmail.com>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: fix stack dump

del_timer_sync() is not to be called in the interrupt context unless
the timer is irqsafe. but most of the functions where commits
6501c8e7d86cca5f and 382d020f4459cd77 touched were called in interrupt
context. And as a result the WARN_ON was getting triggered. Changed
to del_timer() in places which were called from interrupt.

Fixes: 382d020f4459cd77 ("Staging: rtl8712: Eliminate use of _cancel_timer"
Fixes: 6501c8e7d86cca5f ("Staging: rtl8712: Eliminate use of _cancel_timer_ex")
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=97711
Reported-by: Arek Rusniak <arek.rusi@gmail.com>
Tested-by: Arek Rusniak <arek.rusi@gmail.com>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Staging: rtl8712: Eliminate use of _cancel_timer_ex

Use timer API function del_timer_sync instead of driver
specific function _cancel_timer_ex as besides deactivating
a timer, it ensures that the timer is stopped on all
CPUs before the driver exists. Also, definition of function
_cancel_timer_ex is removed as it is no longer needed after
this change.

This is done using Coccinelle and semantic patch used for
this is as follows:

@@ expression x; @@

- _cancel_timer_ex (&x);
+ del_timer_sync (&x);

Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Staging: rtl8712: Eliminate use of _init_timer

This patch introduces the use of API function setup_timer
instead of driver specific function _init_timer as it is
the preferred and standard way to setup and set the timer.
To be compatible with the change, argument types of
referenced functions are changed. Also, definition of
function _init_timer is removed as it is no longer needed
after this change.

This is done using Coccinelle and semantic patch used for
this is as follows:

@@ expression x, y; identifier a, b;@@

- _init_timer (&x, y, a, b);
+ setup_timer (&x, a, (unsigned long)b);

Signed-off-by: Vaishali Thakkar <vthakkar1994@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: remove unused variables

unused variables are removed. These variables were only assigned some
values and after that they were never being used. So they are safe to
be removed , and it has been build tested.

I left a call to r8712_read32(padapter, TCR) and
r8712_read8(padapter, SDIO_HCPWM) .

r8712_read32() and r8712_read8() is ultimately calling usb_read32()
and usb_read8() respectively. and they are again calling
r8712_usbctrl_vendorreq().
this r8712_usbctrl_vendorreq() is communicating through the usb bus
and is sending and receiving the control msg.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: add new line after declarations

This patch fixes checkpatch.pl warning in hal_init.c file
WARNING : Missing a blank line after declarations

Signed-off-by: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: remove wrapper function _set_workitem()

The inline function _set_workitem() simply wraps schedule_work(). Removed.

Signed-off-by: James A Shackleford <shack@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: remove wrapper function _init_workitem()

The inline function _init_workitem() is just a wrapper around INIT_WORK().
Oddly, this wrapper accepts 3 parameters while INIT_WORK() only accepts 2.
The third parameter is unused.

Signed-off-by: James A Shackleford <shack@linux.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: r8712u: Simplify semaphores

I am preparing to convert this driver from semaphore to mutex locking,
The first step has been to eliminate a number of semaphores that were
initialized but never used, and one whose only use was a single "up"
after initialization. A total of 9 semaphores were removed in this process.

One other change was to remove some inline semaphore routines that were
unused.

In addition, several cases had the following structure:

down()
if () {
...
}
up()

The locking overhead was reduced by moving the up/down inside the if
block.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: rtl8712: rtl871x_pwrctrl.c remove one to many l's in the word.

The patch below removes an extra "l" in the word.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

staging: r8712u: Add the new driver to the mainline kernel

This code is for a completely new version of the Realtek 8192 USB devices
such as the D-Link DWA-130. The Realtek code, which was originally for
Linux, Windows XP and Windows CE, has been stripped of all code not needed
for Linux. In addition, only one additional configuration variable, which
enables AP mode, remains.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Florian Schilhabel <florian.c.schilhabel@googlemail.com>
Tested-by: Frederic Leroy <fredo@starox.org>