From: Kees Cook <keescook@chromium.org>
To: Scott Branden <scott.branden@broadcom.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
David Brown <david.brown@linaro.org>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Shuah Khan <shuah@kernel.org>,
bjorn.andersson@linaro.org,
Shuah Khan <skhan@linuxfoundation.org>,
Arnd Bergmann <arnd@arndb.de>,
"Rafael J . Wysocki" <rafael@kernel.org>,
linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-fsdevel@vger.kernel.org,
BCM Kernel Feedback <bcm-kernel-feedback-list@broadcom.com>,
Olof Johansson <olof@lixom.net>,
Andrew Morton <akpm@linux-foundation.org>,
Dan Carpenter <dan.carpenter@oracle.com>,
Colin Ian King <colin.king@canonical.com>,
Takashi Iwai <tiwai@suse.de>,
linux-kselftest@vger.kernel.org, Andy Gross <agross@kernel.org>
Subject: Re: [PATCH] test_firmware: remove unnecessary test_fw_mutex in test_dev_config_show_xxx
Date: Tue, 14 Apr 2020 20:10:43 -0700 [thread overview]
Message-ID: <202004142010.C0847F5@keescook> (raw)
In-Reply-To: <20200415002517.4328-1-scott.branden@broadcom.com>
On Tue, Apr 14, 2020 at 05:25:17PM -0700, Scott Branden wrote:
> Remove unnecessary use of test_fw_mutex in test_dev_config_show_xxx
> functions that show simple bool, int, and u8.
I would expect at least a READ_ONCE(), yes?
>
> Signed-off-by: Scott Branden <scott.branden@broadcom.com>
> ---
> lib/test_firmware.c | 26 +++-----------------------
> 1 file changed, 3 insertions(+), 23 deletions(-)
>
> diff --git a/lib/test_firmware.c b/lib/test_firmware.c
> index 0c7fbcf07ac5..9fee2b93a8d1 100644
> --- a/lib/test_firmware.c
> +++ b/lib/test_firmware.c
> @@ -310,27 +310,13 @@ static int test_dev_config_update_bool(const char *buf, size_t size,
> return ret;
> }
>
> -static ssize_t
> -test_dev_config_show_bool(char *buf,
> - bool config)
> +static ssize_t test_dev_config_show_bool(char *buf, bool val)
> {
> - bool val;
> -
> - mutex_lock(&test_fw_mutex);
> - val = config;
> - mutex_unlock(&test_fw_mutex);
> -
> return snprintf(buf, PAGE_SIZE, "%d\n", val);
> }
>
> -static ssize_t test_dev_config_show_int(char *buf, int cfg)
> +static ssize_t test_dev_config_show_int(char *buf, int val)
> {
> - int val;
> -
> - mutex_lock(&test_fw_mutex);
> - val = cfg;
> - mutex_unlock(&test_fw_mutex);
> -
> return snprintf(buf, PAGE_SIZE, "%d\n", val);
> }
>
> @@ -354,14 +340,8 @@ static int test_dev_config_update_u8(const char *buf, size_t size, u8 *cfg)
> return size;
> }
>
> -static ssize_t test_dev_config_show_u8(char *buf, u8 cfg)
> +static ssize_t test_dev_config_show_u8(char *buf, u8 val)
> {
> - u8 val;
> -
> - mutex_lock(&test_fw_mutex);
> - val = cfg;
> - mutex_unlock(&test_fw_mutex);
> -
> return snprintf(buf, PAGE_SIZE, "%u\n", val);
> }
>
> --
> 2.17.1
>
--
Kees Cook
next prev parent reply other threads:[~2020-04-15 3:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-15 0:25 [PATCH] test_firmware: remove unnecessary test_fw_mutex in test_dev_config_show_xxx Scott Branden
2020-04-15 3:10 ` Kees Cook [this message]
2020-04-15 16:28 ` Scott Branden
2020-04-15 16:44 ` Kees Cook
2020-04-16 6:00 ` Luis Chamberlain
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