diff options
| author | Antoine Tenart <atenart@kernel.org> | 2021-03-22 16:43:29 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-03-22 13:28:13 -0700 |
| commit | 7f08ec6e04269ce53b664761c9108b44ed2f54ab (patch) | |
| tree | 03bbb4e258ee7272db0ca7885503207a03c0a04f /net/core/net-sysfs.c | |
| parent | 7ec05a6035480f3a5934b2b31222620b2e906163 (diff) | |
| download | linux-7f08ec6e04269ce53b664761c9108b44ed2f54ab.tar.gz | |
net-sysfs: remove possible sleep from an RCU read-side critical section
xps_queue_show is mostly made of an RCU read-side critical section and
calls bitmap_zalloc with GFP_KERNEL in the middle of it. That is not
allowed as this call may sleep and such behaviours aren't allowed in RCU
read-side critical sections. Fix this by using GFP_NOWAIT instead.
Fixes: 5478fcd0f483 ("net: embed nr_ids in the xps maps")
Reported-by: kernel test robot <oliver.sang@intel.com>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Antoine Tenart <atenart@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/net-sysfs.c')
| -rw-r--r-- | net/core/net-sysfs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index 562a42fcd437..f6197774048b 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -1378,7 +1378,7 @@ static ssize_t xps_queue_show(struct net_device *dev, unsigned int index, nr_ids = dev_maps ? dev_maps->nr_ids : (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues); - mask = bitmap_zalloc(nr_ids, GFP_KERNEL); + mask = bitmap_zalloc(nr_ids, GFP_NOWAIT); if (!mask) { rcu_read_unlock(); return -ENOMEM; |