From: "Sergey V." <sftp.mtuci@gmail.com>
To: "Justin P. Mattock" <justinmattock@gmail.com>
Cc: linux-kernel@vger.kernel.org, reiserfs-devel@vger.kernel.org,
linux-bluetooth@vger.kernel.org, clemens@ladisch.de,
debora@linux.vnet.ibm.com, dri-devel@lists.freedesktop.org,
linux-i2c@vger.kernel.org, linux1394-devel@lists.sourceforge.net,
linux-media@vger.kernel.org
Subject: Re: [PATCH 4/8]drivers:tmp.c Fix warning: variable 'rc' set but not used
Date: Tue, 15 Jun 2010 22:53:43 +0400 [thread overview]
Message-ID: <201006152253.44326.sftp.mtuci@gmail.com> (raw)
In-Reply-To: <1276547208-26569-5-git-send-email-justinmattock@gmail.com>
On Tuesday 15 of June 2010 00:26:44 Justin P. Mattock wrote:
> Im getting this warning when compiling:
> CC drivers/char/tpm/tpm.o
> drivers/char/tpm/tpm.c: In function 'tpm_gen_interrupt':
> drivers/char/tpm/tpm.c:508:10: warning: variable 'rc' set but not used
>
> The below patch gets rid of the warning,
> but I'm not sure if it's the best solution.
>
> Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
>
> ---
> drivers/char/tpm/tpm.c | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
> index 05ad4a1..3d685dc 100644
> --- a/drivers/char/tpm/tpm.c
> +++ b/drivers/char/tpm/tpm.c
> @@ -514,6 +514,8 @@ void tpm_gen_interrupt(struct tpm_chip *chip)
>
> rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
> "attempting to determine the timeouts");
> + if (!rc)
> + rc = 0;
> }
> EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
>
> --
> 1.7.1.rc1.21.gf3bd6
>
Hi Justin
IMHO
See code of functions tpm_transmit(), transmit_cmd and tpm_gen_interrupt().
In tpm_gen_interrupt() not need check rc for wrong value bacause if in function
transmit_cmd() len == TPM_ERROR_SIZE then put a debug message (dev_dbg()).
Again, if something wrong in tpm_transmit() then runs dev_err() and rc in
tpm_gen_interrupt() get -E* value.
So, we can remove unused rc variable in tpm_gen_interrupt().
See patch below. Note: I not tested it.
Subject: [PATCH] drivers: tpm.c: Remove unused variable 'rc'
---
drivers/char/tpm/tpm.c | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 05ad4a1..f9f5b47 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -505,15 +505,14 @@ ssize_t tpm_getcap(struct device *dev, __be32 subcap_id,
cap_t *cap,
void tpm_gen_interrupt(struct tpm_chip *chip)
{
struct tpm_cmd_t tpm_cmd;
- ssize_t rc;
tpm_cmd.header.in = tpm_getcap_header;
tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
- rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
- "attempting to determine the timeouts");
+ transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
+ "attempting to determine the timeouts");
}
EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
--
1.7.1
next prev parent reply other threads:[~2010-06-15 18:53 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-14 20:26 [PATCH 0/8] Fix gcc 4.6.0 set but not used warning messages Justin P. Mattock
2010-06-14 20:26 ` [PATCH 1/8]reiserfs:stree.c Fix variable set but not used Justin P. Mattock
2010-06-14 20:48 ` Nick Bowler
2010-06-14 21:09 ` Justin P. Mattock
2010-06-14 21:05 ` Edward Shishkin
2010-06-14 21:21 ` Justin P. Mattock
2010-06-14 21:47 ` Edward Shishkin
2010-06-14 22:50 ` Justin P. Mattock
2010-06-14 23:07 ` Stefan Richter
2010-06-15 0:01 ` Justin P. Mattock
2010-06-14 20:26 ` [PATCH 2/8]bluetooth/hci_ldisc.c Fix warning: variable 'tty' " Justin P. Mattock
2010-06-15 0:24 ` Gustavo F. Padovan
2010-06-14 20:26 ` [PATCH 3/8]char/hpet.c Fix variable 'hpet' " Justin P. Mattock
2010-06-14 20:26 ` [PATCH 4/8]drivers:tmp.c Fix warning: variable 'rc' " Justin P. Mattock
2010-06-15 0:13 ` Valdis.Kletnieks
2010-06-15 2:12 ` Justin P. Mattock
2010-06-15 3:49 ` Valdis.Kletnieks
2010-06-15 3:56 ` Justin P. Mattock
2010-06-15 5:29 ` Peter Stuge
2010-06-15 5:58 ` Justin P. Mattock
2010-06-15 6:57 ` Stefan Richter
2010-06-15 7:27 ` Justin P. Mattock
2010-06-15 7:56 ` Stefan Richter
2010-06-15 8:30 ` Justin P. Mattock
2010-06-15 9:19 ` Jean Delvare
2010-06-15 9:41 ` Justin P. Mattock
2010-06-15 18:53 ` Sergey V. [this message]
2010-06-15 19:36 ` Justin P. Mattock
2010-06-14 20:26 ` [PATCH 5/8]drm:drm_gem Fix warning: variable 'dev' " Justin P. Mattock
2010-06-14 20:26 ` [PATCH 6/8]i2c:i2c_core Fix warning: variable 'dummy' " Justin P. Mattock
2010-06-14 20:53 ` Jean Delvare
2010-06-14 21:06 ` Justin P. Mattock
2010-06-15 11:43 ` Jean Delvare
2010-06-15 16:51 ` Justin P. Mattock
2010-06-14 21:28 ` David Daney
2010-06-15 11:40 ` Jean Delvare
2010-06-15 16:20 ` David Daney
2010-06-16 9:45 ` Jean Delvare
2010-06-14 20:26 ` [PATCH 7/8]ieee1394/sdp2 Fix warning: variable 'unit_characteristics' " Justin P. Mattock
2010-06-14 21:44 ` [PATCH] ieee1394: sbp2: remove unused code Stefan Richter
2010-06-14 22:35 ` Justin P. Mattock
2010-06-14 23:22 ` Stefan Richter
2010-06-14 23:58 ` Justin P. Mattock
2010-06-15 0:08 ` (no subject) Stefan Richter
2010-06-15 0:00 ` [PATCH] ieee1394: remove unused variables Stefan Richter
2010-06-15 0:05 ` [PATCH] ieee1394: sbp2: remove unused code Stefan Richter
2010-06-15 1:59 ` Justin P. Mattock
2010-06-15 11:38 ` [PATCH 7/8]ieee1394/sdp2 Fix warning: variable 'unit_characteristics' set but not used Jean Delvare
2010-06-15 16:52 ` Justin P. Mattock
2010-06-14 20:26 ` [PATCH 8/8]tuners:tuner-simple Fix warning: variable 'tun' " Justin P. Mattock
2010-06-15 5:16 ` Mauro Carvalho Chehab
2010-06-15 5:37 ` Justin P. Mattock
2010-06-15 5:50 ` Justin P. Mattock
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