[PATCH v5 00/19] staging: r8188eu: Shorten and simplify calls chain

Fabio M. De Francesco
2021-09-15T12:42:13Z

io_ops abstraction is useless in this driver, since there is only one ops
registration. Without io_ops we can get rid of indirect calls mess and
shorten the calls chain.

Shorten the calls chain of rtw_read8/16/32() down to the actual reads.
For this purpose unify the three usb_read8/16/32 into the new
usb_read(); make the latter parameterizable with 'size'; embed most of
the code of usbctrl_vendorreq() into usb_read() and use in it the new
usb_control_msg_recv() API of USB Core.

Shorten the calls chain of rtw_write8/16/32() down to the actual writes.
For this purpose unify the four usb_write8/16/32/N() into the new
usb_write(); make the latter parameterizable with 'size'; embed most of
the code of usbctrl_vendorreq() into usb_write() and use in it the new
usb_control_msg_send() API of USB Core.

The code with the modifications was thoroughly tested by Pavel Skripkin
using a TP-Link TL-WN722N v2 / v3 [Realtek RTL8188EUS] and by Fabio M.
De Francesco using a ASUSTek Computer, Inc. Realtek 8188EUS [USB-N10 Nano].

Changelog:

v4->v5:
- 1-14:
No changes;
- 15-16:
Fix minor formatting issues and use "Reverse Xmas Tree" style,
according to suggestions by David Laight and Dan Carpenter;
- 17-18:
Pavel Skripkin found logical errors in the checks of the
values returned by usb_control_msg_{recv,send}(), so fix them;
Dan Carpenter suggested to do error handling before success
handling, so change the code accordingly;
- 19:
Add this patch in order to get rid of the shared buffer in
usb_read() and usb_write() and remove this field from struct
"dvobj_priv".

v3->v4:
- 1-14:
Split a patch into fourteen;
- 15-16:
Add these patches for clean-ups of the code that is going to be
reused in 17-18/18;
- 17-18:
Make some changes according to a first review of Greg
Kroah-Hartman; furthermore, remove the unnecessary while loop
and a couple of if' test; handle the errors returned by
usb_control_msg_recv().

v2->v3:
- 1:
No changes;
- 3:
Fix the version number of the patch.

v1->v2:
- 1:
No changes;
- 3:
Replace parameter REALTEK_USB_VENQT_READ with REALTEK_USB_VENQT_WRITE
in usb_control_msg_send(). More in-depth explanation at
https://lore.kernel.org/lkml/2791328.7pjKATJfGa@localhost.localdomain/T/#m1fc1ab2f7c1f463049ad88d5df5bb1b107b37260

v1: https://lore.kernel.org/lkml/20210904150447.14659-1-fmdefrancesco@gmail.com/
v2: https://lore.kernel.org/lkml/20210904212719.11426-1-fmdefrancesco@gmail.com/
v3: https://lore.kernel.org/lkml/20210904220048.12822-1-fmdefrancesco@gmail.com/
v4: https://lore.kernel.org/lkml/20210913181002.16651-1-fmdefrancesco@gmail.com/

Fabio M. De Francesco (4):
staging: r8188eu: hal: Clean up usbctrl_vendorreq()
staging: r8188eu: hal: Clean up rtw_read*() and rtw_write*()
staging: r8188eu: Shorten calls chain of rtw_read8/16/32()
staging: r8188eu: Shorten calls chain of rtw_write8/16/32/N()

Pavel Skripkin (15):
staging: r8188eu: remove usb_{read,write}_mem
staging: r8188eu: remove the helpers of rtw_read8()
staging: r8188eu: remove the helpers of rtw_read16()
staging: r8188eu: remove the helpers of rtw_read32()
staging: r8188eu: remove the helpers of usb_write8
staging: r8188eu: remove the helpers of usb_write16
staging: r8188eu: remove the helpers of usb_write32
staging: r8188eu: remove the helpers of usb_writeN
staging: r8188eu: remove the helpers of usb_read_port
staging: r8188eu: remove the helpers of usb_write_port
staging: r8188eu: remove the helpers of usb_read_port_cancel
staging: r8188eu: remove the helpers of usb_write_port_cancel
staging: r8188eu: remove core/rtw_io.c
staging: remove struct _io_ops
staging: r8188eu: remove shared buffer for usb requests

drivers/staging/r8188eu/Makefile | 1 -
drivers/staging/r8188eu/core/rtw_io.c | 299 ------------------
drivers/staging/r8188eu/hal/usb_halinit.c | 6 +-
drivers/staging/r8188eu/hal/usb_ops_linux.c | 261 ++++++++-------
drivers/staging/r8188eu/include/drv_types.h | 5 -
drivers/staging/r8188eu/include/rtw_io.h | 89 +-----
drivers/staging/r8188eu/include/usb_ops.h | 2 -
.../staging/r8188eu/include/usb_ops_linux.h | 8 -
drivers/staging/r8188eu/os_dep/usb_intf.c | 37 +--
.../staging/r8188eu/os_dep/usb_ops_linux.c | 20 +-
10 files changed, 166 insertions(+), 562 deletions(-)
delete mode 100644 drivers/staging/r8188eu/core/rtw_io.c

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2.33.0