From: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To: Larry.Finger@lwfinger.net, phil@philpotter.co.uk,
gregkh@linuxfoundation.org, straube.linux@gmail.com,
Pavel Skripkin <paskripkin@gmail.com>
Cc: linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org,
Pavel Skripkin <paskripkin@gmail.com>
Subject: Re: [PATCH RFC 1/3] staging: r8188eu: add proper rtw_read* error handling
Date: Sat, 21 Aug 2021 07:55:38 +0200 [thread overview]
Message-ID: <5720270.rXTAdOU5UK@localhost.localdomain> (raw)
In-Reply-To: <f4fb967c992c29c8d2e8f67e78835b52a60d2e52.1629479152.git.paskripkin@gmail.com>
On Friday, August 20, 2021 7:07:36 PM CEST Pavel Skripkin wrote:
> rtw_read*() functions call usb_read* inside. These functions could fail
> in some cases; for example: failed to receive control message. These
> cases should be handled to prevent uninit value bugs, since usb_read*
> functions blindly return stack variable without checking if this value
> _actualy_ initialized.
>
> To achive it, all usb_read* and rtw_read*() argument list is expanded
Dear Pavel,
Please, achive --> achieve.
> with pointer to error and added error usbctrl_vendorreq() error checking.
> If transfer is successful error will be initialized to 0 otherwise to
> error returned from usb_control_msg().
>
> To not break the build, added error checking for rtw_read*() call all
> across the driver.
>
> Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
> ---
> drivers/staging/r8188eu/core/rtw_debug.c | 79 +++-
> drivers/staging/r8188eu/core/rtw_efuse.c | 83 +++-
> drivers/staging/r8188eu/core/rtw_io.c | 18 +-
> drivers/staging/r8188eu/core/rtw_mp.c | 37 +-
> drivers/staging/r8188eu/core/rtw_mp_ioctl.c | 20 +-
> drivers/staging/r8188eu/core/rtw_pwrctrl.c | 6 +-
> drivers/staging/r8188eu/core/rtw_sreset.c | 7 +-
> drivers/staging/r8188eu/hal/HalPwrSeqCmd.c | 9 +-
> drivers/staging/r8188eu/hal/hal_com.c | 22 +-
> drivers/staging/r8188eu/hal/odm_interface.c | 12 +-
> drivers/staging/r8188eu/hal/rtl8188e_cmd.c | 37 +-
> drivers/staging/r8188eu/hal/rtl8188e_dm.c | 6 +-
> .../staging/r8188eu/hal/rtl8188e_hal_init.c | 198 +++++++--
> drivers/staging/r8188eu/hal/rtl8188e_phycfg.c | 26 +-
> drivers/staging/r8188eu/hal/rtl8188e_sreset.c | 20 +-
> drivers/staging/r8188eu/hal/rtl8188eu_led.c | 17 +-
> drivers/staging/r8188eu/hal/usb_halinit.c | 394 ++++++++++++++----
> drivers/staging/r8188eu/hal/usb_ops_linux.c | 16 +-
> drivers/staging/r8188eu/include/rtw_io.h | 18 +-
> drivers/staging/r8188eu/os_dep/ioctl_linux.c | 168 +++++---
> 20 files changed, 941 insertions(+), 252 deletions(-)
I agree with Philip: please, split this long patch. If I were you, I'd make
one patch for each of the three rtw_read*() and a fourth patch for usb_read*().
> --- a/drivers/staging/r8188eu/core/rtw_io.c
> +++ b/drivers/staging/r8188eu/core/rtw_io.c
> @@ -34,44 +34,44 @@ jackson@realtek.com.tw
> #define rtw_cpu_to_le16(val) cpu_to_le16(val)
> #define rtw_cpu_to_le32(val) cpu_to_le32(val)
Not related to your patch, these macros are useless and misleading.
> -u8 _rtw_read8(struct adapter *adapter, u32 addr)
> +u8 _rtw_read8(struct adapter *adapter, u32 addr, int *error)
> {
> u8 r_val;
> struct io_priv *pio_priv = &adapter->iopriv;
> struct intf_hdl *pintfhdl = &pio_priv->intf;
> - u8 (*_read8)(struct intf_hdl *pintfhdl, u32 addr);
> + u8 (*_read8)(struct intf_hdl *pintfhdl, u32 addr, int *error);
>
>
> _read8 = pintfhdl->io_ops._read8;
> - r_val = _read8(pintfhdl, addr);
> + r_val = _read8(pintfhdl, addr, error);
>
> return r_val;
> }
I really don't like passing errors through arguments. Why don't you pass
a storage location where the function save the byte read and instead use the
return for errors? I think that this would result in a cleaner design. Furthermore,
it is used everywhere in the kernel.
> -u16 _rtw_read16(struct adapter *adapter, u32 addr)
> +u16 _rtw_read16(struct adapter *adapter, u32 addr, int *error)
> {
> u16 r_val;
> struct io_priv *pio_priv = &adapter->iopriv;
> struct intf_hdl *pintfhdl = &pio_priv->intf;
> - u16 (*_read16)(struct intf_hdl *pintfhdl, u32 addr);
> + u16 (*_read16)(struct intf_hdl *pintfhdl, u32 addr, int *error);
>
> _read16 = pintfhdl->io_ops._read16;
>
> - r_val = _read16(pintfhdl, addr);
> + r_val = _read16(pintfhdl, addr, error);
>
> return r_val;
> }
Same.
> -u32 _rtw_read32(struct adapter *adapter, u32 addr)
> +u32 _rtw_read32(struct adapter *adapter, u32 addr, int *error)
> {
> u32 r_val;
> struct io_priv *pio_priv = &adapter->iopriv;
> struct intf_hdl *pintfhdl = &pio_priv->intf;
> - u32 (*_read32)(struct intf_hdl *pintfhdl, u32 addr);
> + u32 (*_read32)(struct intf_hdl *pintfhdl, u32 addr, int *error);
>
> _read32 = pintfhdl->io_ops._read32;
>
> - r_val = _read32(pintfhdl, addr);
> + r_val = _read32(pintfhdl, addr, error);
>
> return r_val;
> }
Same.
I'm done for now: too many lines to read all at once :)
Regards,
Fabio
next prev parent reply other threads:[~2021-08-21 5:59 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-20 17:07 [PATCH RFC 0/3] staging: r8188eu: avoid uninit value bugs Pavel Skripkin
2021-08-20 17:07 ` [PATCH RFC 1/3] staging: r8188eu: add proper rtw_read* error handling Pavel Skripkin
2021-08-20 21:50 ` Pavel Skripkin
2021-08-20 23:41 ` Phillip Potter
2021-08-21 5:55 ` Fabio M. De Francesco [this message]
2021-08-21 10:35 ` Pavel Skripkin
2021-08-21 12:11 ` Fabio M. De Francesco
2021-08-20 17:07 ` [PATCH RFC 2/3] staging: r8188eu: add error handling to ReadFuse Pavel Skripkin
2021-08-20 23:51 ` Phillip Potter
2021-08-21 3:59 ` Fabio M. De Francesco
2021-08-20 17:07 ` [PATCH RFC 3/3] staging: r8188eu: add error argument to read_macreg Pavel Skripkin
2021-08-20 23:18 ` Phillip Potter
2021-08-21 10:38 ` Pavel Skripkin
2021-08-20 23:12 ` [PATCH RFC 0/3] staging: r8188eu: avoid uninit value bugs Phillip Potter
2021-08-21 10:42 ` Pavel Skripkin
2021-08-22 9:53 ` Fabio M. De Francesco
2021-08-22 10:09 ` Pavel Skripkin
2021-08-22 10:59 ` Fabio M. De Francesco
2021-08-22 11:34 ` Fabio M. De Francesco
2021-08-22 12:10 ` Pavel Skripkin
2021-08-22 12:39 ` Greg KH
2021-08-22 12:50 ` Pavel Skripkin
2021-08-22 13:06 ` Greg KH
2021-08-22 13:21 ` Fabio M. De Francesco
2021-08-22 13:30 ` Greg KH
2021-08-22 13:31 ` Pavel Skripkin
2021-08-22 14:35 ` [PATCH RFC v2 0/6] " Pavel Skripkin
2021-08-22 14:35 ` [PATCH RFC v2 1/6] staging: r8188eu: remove {read,write}_macreg Pavel Skripkin
2021-08-22 14:35 ` [PATCH RFC v2 2/6] staging: r8188eu: add helper macro for printing registers Pavel Skripkin
2021-08-22 14:35 ` [PATCH RFC v2 3/6] staging: r8188eu: add error handling of rtw_read8 Pavel Skripkin
2021-08-22 14:35 ` [PATCH RFC v2 4/6] staging: r8188eu: add error handling of rtw_read16 Pavel Skripkin
2021-08-22 14:36 ` [PATCH RFC v2 5/6] staging: r8188eu: add error handling of rtw_read32 Pavel Skripkin
2021-08-23 23:33 ` Phillip Potter
2021-08-24 0:10 ` Fabio M. De Francesco
2021-08-24 6:40 ` Pavel Skripkin
2021-08-24 8:38 ` Fabio M. De Francesco
2021-08-24 8:47 ` Pavel Skripkin
2021-08-24 8:53 ` Pavel Skripkin
2021-08-24 9:46 ` Fabio M. De Francesco
2021-08-24 22:10 ` Phillip Potter
2021-08-24 22:07 ` Phillip Potter
2021-08-24 6:53 ` Pavel Skripkin
2021-08-24 7:25 ` [PATCH v3 0/6] staging: r8188eu: avoid uninit value bugs Pavel Skripkin
2021-08-24 7:27 ` [PATCH v3 1/6] staging: r8188eu: remove {read,write}_macreg Pavel Skripkin
2021-08-26 10:39 ` Greg KH
2021-08-26 10:40 ` Greg KH
2021-08-24 7:27 ` [PATCH v3 2/6] staging: r8188eu: add helper macro for printing registers Pavel Skripkin
2021-08-26 10:37 ` Greg KH
2021-08-24 7:27 ` [PATCH v3 3/6] staging: r8188eu: add error handling of rtw_read8 Pavel Skripkin
2021-08-25 12:05 ` kernel test robot
2021-08-25 12:17 ` Pavel Skripkin
2021-08-25 12:51 ` Dan Carpenter
2021-08-25 13:02 ` Pavel Skripkin
2021-08-25 13:34 ` Dan Carpenter
2021-08-25 13:44 ` Pavel Skripkin
2021-08-25 17:11 ` Nick Desaulniers
2021-08-26 11:08 ` Dan Carpenter
2021-08-25 23:45 ` Fabio M. De Francesco
2021-08-26 5:13 ` Pavel Skripkin
2021-08-26 8:21 ` David Laight
2021-08-26 8:27 ` Pavel Skripkin
2021-08-26 10:19 ` David Laight
2021-08-26 11:21 ` Dan Carpenter
2021-08-27 8:14 ` David Laight
2021-08-27 8:22 ` Pavel Skripkin
2021-08-27 9:07 ` Dan Carpenter
2021-08-27 9:16 ` Pavel Skripkin
2021-08-27 9:23 ` Dan Carpenter
2021-08-30 11:21 ` kernel test robot
2021-08-24 7:27 ` [PATCH v3 4/6] staging: r8188eu: add error handling of rtw_read16 Pavel Skripkin
2021-08-25 4:35 ` Fabio M. De Francesco
2021-08-25 8:22 ` Pavel Skripkin
2021-08-25 9:48 ` Fabio M. De Francesco
2021-08-25 9:55 ` Pavel Skripkin
2021-08-25 10:06 ` Dan Carpenter
2021-08-25 10:13 ` Pavel Skripkin
2021-08-25 10:38 ` Dan Carpenter
2021-08-25 10:41 ` Pavel Skripkin
2021-08-25 11:06 ` Fabio M. De Francesco
2021-08-25 11:11 ` Fabio M. De Francesco
2021-08-25 11:31 ` Dan Carpenter
2021-08-25 12:11 ` Fabio M. De Francesco
2021-08-25 10:51 ` Fabio M. De Francesco
2021-08-26 10:50 ` Greg KH
2021-08-26 10:58 ` Pavel Skripkin
2021-08-24 7:27 ` [PATCH v3 5/6] staging: r8188eu: add error handling of rtw_read32 Pavel Skripkin
2021-08-25 4:40 ` Fabio M. De Francesco
2021-08-26 8:51 ` David Laight
2021-08-26 9:22 ` Pavel Skripkin
2021-08-26 9:27 ` Pavel Skripkin
2021-08-26 10:22 ` David Laight
2021-08-26 10:55 ` Pavel Skripkin
2021-08-26 10:59 ` David Laight
2021-08-26 20:03 ` Pavel Skripkin
2021-08-27 7:12 ` gregkh
2021-08-27 7:16 ` Pavel Skripkin
2021-08-24 7:27 ` [PATCH v3 6/6] staging: r8188eu: make ReadEFuse return an int Pavel Skripkin
2021-08-25 10:13 ` [PATCH v3 0/6] staging: r8188eu: avoid uninit value bugs Fabio M. De Francesco
2021-08-27 7:49 ` Kari Argillander
2021-08-27 7:52 ` Pavel Skripkin
2021-08-24 6:58 ` [PATCH RFC v2 5/6] staging: r8188eu: add error handling of rtw_read32 Dan Carpenter
2021-08-24 7:01 ` Pavel Skripkin
2021-08-24 15:07 ` Fabio M. De Francesco
2021-08-22 14:36 ` [PATCH RFC v2 6/6] staging: r8188eu: make ReadEFuse return an int Pavel Skripkin
2021-08-22 15:30 ` [PATCH RFC v2 0/6] staging: r8188eu: avoid uninit value bugs Pavel Skripkin
2021-08-22 16:05 ` Michael Straube
2021-08-22 16:26 ` Pavel Skripkin
2021-08-22 23:52 ` Phillip Potter
2021-08-22 17:36 ` Fabio M. De Francesco
2021-08-22 17:38 ` Pavel Skripkin
2021-08-22 20:06 ` Fabio M. De Francesco
2021-08-22 20:19 ` Pavel Skripkin
2021-08-23 0:12 ` Phillip Potter
2021-08-23 6:38 ` Pavel Skripkin
2021-08-23 6:44 ` Pavel Skripkin
2021-08-22 16:03 ` [PATCH RFC 0/3] " Fabio M. De Francesco
2021-08-22 16:15 ` Pavel Skripkin
2021-08-22 15:04 ` Phillip Potter
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