diff mbox series

[net-next,v4,05/18] net: dsa: mv88e6xxx: remove redundant check in mv88e6xxx_port_vlan()

Message ID 20220415122947.2754662-6-jakobkoschel@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series Remove use of list iterator after loop body | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count fail Series longer than 15 patches (and no cover letter)
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 17 of 17 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, 9 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Jakob Koschel April 15, 2022, 12:29 p.m. UTC 
From: Vladimir Oltean <vladimir.oltean@nxp.com>

We know that "dev > dst->last_switch" in the "else" block.
In other words, that "dev - dst->last_switch" is > 0.

dsa_port_bridge_num_get(dp) can be 0, but the check
"if (bridge_num + dst->last_switch != dev) continue", rewritten as
"if (bridge_num != dev - dst->last_switch) continue", aka
"if (bridge_num != something which cannot be 0) continue",
makes it redundant to have the extra "if (!bridge_num) continue" logic,
since a bridge_num of zero would have been skipped anyway.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 3 ---
 1 file changed, 3 deletions(-)

Comments

Florian Fainelli April 16, 2022, 7:38 p.m. UTC | #1 
On 4/15/2022 5:29 AM, Jakob Koschel wrote:
> From: Vladimir Oltean <vladimir.oltean@nxp.com>
> 
> We know that "dev > dst->last_switch" in the "else" block.
> In other words, that "dev - dst->last_switch" is > 0.
> 
> dsa_port_bridge_num_get(dp) can be 0, but the check
> "if (bridge_num + dst->last_switch != dev) continue", rewritten as
> "if (bridge_num != dev - dst->last_switch) continue", aka
> "if (bridge_num != something which cannot be 0) continue",
> makes it redundant to have the extra "if (!bridge_num) continue" logic,
> since a bridge_num of zero would have been skipped anyway.
> 
> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
> Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
diff mbox series

Patch

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 64f4fdd02902..b3aa0e5bc842 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -1404,9 +1404,6 @@  static u16 mv88e6xxx_port_vlan(struct mv88e6xxx_chip *chip, int dev, int port)
 		list_for_each_entry(dp, &dst->ports, list) {
 			unsigned int bridge_num = dsa_port_bridge_num_get(dp);
 
-			if (!bridge_num)
-				continue;
-
 			if (bridge_num + dst->last_switch != dev)
 				continue;