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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: 5478fcd0f4 ("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>
This commit is contained in:
Antoine Tenart 2021-03-22 16:43:29 +01:00 committed by David S. Miller
parent 7ec05a6035
commit 7f08ec6e04
1 changed files with 1 additions and 1 deletions
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2
net/core/net-sysfs.c
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@ -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;