diff mbox series

[net-next,5/6] net: adopt try_cmpxchg() in napi_{enable|disable}()

Message ID 20221115091101.2234482-6-edumazet@google.com (mailing list archive)
State Accepted
Commit 4ffa1d1c6842a97e84cfbe56bfcf70edb23608e2
Delegated to: Netdev Maintainers
Headers show
Series net: more try_cmpxchg() conversions | 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 success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/cc_maintainers warning 1 maintainers not CCed: petrm@nvidia.com
netdev/build_clang success Errors and warnings before: 5 this patch: 5
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 8 this patch: 8
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 39 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Eric Dumazet Nov. 15, 2022, 9:11 a.m. UTC 
This makes code a bit cleaner.

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
 net/core/dev.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)
diff mbox series

Patch

diff --git a/net/core/dev.c b/net/core/dev.c
index 0c12c7ad04f21da05fef4c60ca5570bff48ec491..fb943dad96513e0f9eb1c3ce30c5bb7170edea5e 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6397,8 +6397,8 @@  void napi_disable(struct napi_struct *n)
 	might_sleep();
 	set_bit(NAPI_STATE_DISABLE, &n->state);
 
-	for ( ; ; ) {
-		val = READ_ONCE(n->state);
+	val = READ_ONCE(n->state);
+	do {
 		if (val & (NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC)) {
 			usleep_range(20, 200);
 			continue;
@@ -6406,10 +6406,7 @@  void napi_disable(struct napi_struct *n)
 
 		new = val | NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC;
 		new &= ~(NAPIF_STATE_THREADED | NAPIF_STATE_PREFER_BUSY_POLL);
-
-		if (cmpxchg(&n->state, val, new) == val)
-			break;
-	}
+	} while (!try_cmpxchg(&n->state, &val, new));
 
 	hrtimer_cancel(&n->timer);
 
@@ -6426,16 +6423,15 @@  EXPORT_SYMBOL(napi_disable);
  */
 void napi_enable(struct napi_struct *n)
 {
-	unsigned long val, new;
+	unsigned long new, val = READ_ONCE(n->state);
 
 	do {
-		val = READ_ONCE(n->state);
 		BUG_ON(!test_bit(NAPI_STATE_SCHED, &val));
 
 		new = val & ~(NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC);
 		if (n->dev->threaded && n->thread)
 			new |= NAPIF_STATE_THREADED;
-	} while (cmpxchg(&n->state, val, new) != val);
+	} while (!try_cmpxchg(&n->state, &val, new));
 }
 EXPORT_SYMBOL(napi_enable);