diff mbox series

net: dsa: return success if there was nothing to do

Message ID 20220305171448.692839-1-trix@redhat.com (mailing list archive)
State Accepted
Commit cd5169841c49dab75ecc3b20b3bd1100395b6909
Delegated to: Netdev Maintainers
Headers show
Series net: dsa: return success if there was nothing to do | expand

Checks

Context Check Description
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Single patches do not need cover letters
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers success CCed 10 of 10 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 16 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/tree_selection success Guessing tree name failed - patch did not apply

Commit Message

Tom Rix March 5, 2022, 5:14 p.m. UTC 
From: Tom Rix <trix@redhat.com>

Clang static analysis reports this representative issue
dsa.c:486:2: warning: Undefined or garbage value
  returned to caller
  return err;
  ^~~~~~~~~~

err is only set in the loop.  If the loop is empty,
garbage will be returned.  So initialize err to 0
to handle this noop case.

Signed-off-by: Tom Rix <trix@redhat.com>
---
 net/dsa/dsa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Andrew Lunn March 5, 2022, 7:11 p.m. UTC | #1 
On Sat, Mar 05, 2022 at 09:14:48AM -0800, trix@redhat.com wrote:
> From: Tom Rix <trix@redhat.com>
> 
> Clang static analysis reports this representative issue
> dsa.c:486:2: warning: Undefined or garbage value
>   returned to caller
>   return err;
>   ^~~~~~~~~~
> 
> err is only set in the loop.  If the loop is empty,
> garbage will be returned.  So initialize err to 0
> to handle this noop case.
> 
> Signed-off-by: Tom Rix <trix@redhat.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew
Vladimir Oltean March 5, 2022, 8:32 p.m. UTC | #2 
On Sat, Mar 05, 2022 at 09:14:48AM -0800, trix@redhat.com wrote:
> From: Tom Rix <trix@redhat.com>
> 
> Clang static analysis reports this representative issue
> dsa.c:486:2: warning: Undefined or garbage value
>   returned to caller
>   return err;
>   ^~~~~~~~~~
> 
> err is only set in the loop.  If the loop is empty,
> garbage will be returned.  So initialize err to 0
> to handle this noop case.
> 
> Signed-off-by: Tom Rix <trix@redhat.com>
> ---

Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
patchwork-bot+netdevbpf@kernel.org March 7, 2022, 12:30 p.m. UTC | #3 
Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Sat,  5 Mar 2022 09:14:48 -0800 you wrote:
> From: Tom Rix <trix@redhat.com>
> 
> Clang static analysis reports this representative issue
> dsa.c:486:2: warning: Undefined or garbage value
>   returned to caller
>   return err;
>   ^~~~~~~~~~
> 
> [...]

Here is the summary with links:
  - net: dsa: return success if there was nothing to do
    https://git.kernel.org/netdev/net-next/c/cd5169841c49

You are awesome, thank you!
diff mbox series

Patch

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 06d5de28a43ea..fe971a2c15cd1 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -471,7 +471,7 @@  int dsa_port_walk_fdbs(struct dsa_switch *ds, int port, dsa_fdb_walk_cb_t cb)
 {
 	struct dsa_port *dp = dsa_to_port(ds, port);
 	struct dsa_mac_addr *a;
-	int err;
+	int err = 0;
 
 	mutex_lock(&dp->addr_lists_lock);
 
@@ -491,7 +491,7 @@  int dsa_port_walk_mdbs(struct dsa_switch *ds, int port, dsa_fdb_walk_cb_t cb)
 {
 	struct dsa_port *dp = dsa_to_port(ds, port);
 	struct dsa_mac_addr *a;
-	int err;
+	int err = 0;
 
 	mutex_lock(&dp->addr_lists_lock);