diff mbox series

[v2,1/4] net: move setup code out of mutex in __netif_set_xps_queue()

Message ID 20221013234349.1165689-2-yury.norov@gmail.com (mailing list archive)
State Deferred
Delegated to: Netdev Maintainers
Headers show
Series net: drop netif_attrmask_next*() | expand

Checks

Context Check Description
netdev/tree_selection success Guessed tree name to be net-next, async
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 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 success CCed 6 of 6 maintainers
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, 19 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Yury Norov Oct. 13, 2022, 11:43 p.m. UTC 
maps_sz, nr_ids and online_mask may be set out of the mutex.

Signed-off-by: Yury Norov <yury.norov@gmail.com>
---
 net/core/dev.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/net/core/dev.c b/net/core/dev.c
index fa53830d0683..70fa12c6551c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2563,9 +2563,6 @@  int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
 			return -EINVAL;
 	}
 
-	mutex_lock(&xps_map_mutex);
-
-	dev_maps = xmap_dereference(dev->xps_maps[type]);
 	if (type == XPS_RXQS) {
 		maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues);
 		nr_ids = dev->num_rx_queues;
@@ -2579,6 +2576,10 @@  int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
 	if (maps_sz < L1_CACHE_BYTES)
 		maps_sz = L1_CACHE_BYTES;
 
+	mutex_lock(&xps_map_mutex);
+
+	dev_maps = xmap_dereference(dev->xps_maps[type]);
+
 	/* The old dev_maps could be larger or smaller than the one we're
 	 * setting up now, as dev->num_tc or nr_ids could have been updated in
 	 * between. We could try to be smart, but let's be safe instead and only