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authorJia-Ju Bai <baijiaju1990@163.com>2017-06-10 10:49:39 +0200
committerDavid S. Miller <davem@davemloft.net>2017-06-11 00:19:45 +0200
commitf146e872eb12ebbe92d8e583b2637e0741440db3 (patch)
tree11df674fe1f70d91c86b2a63cfec66f8823ecfd1 /drivers/pinctrl/sunxi
parentRevert "net: fec: Add a fec_enet_clear_ethtool_stats() stub for CONFIG_M5272" (diff)
downloadlinux-f146e872eb12ebbe92d8e583b2637e0741440db3.tar.xz
linux-f146e872eb12ebbe92d8e583b2637e0741440db3.zip
net: caif: Fix a sleep-in-atomic bug in cfpkt_create_pfx
The kernel may sleep under a rcu read lock in cfpkt_create_pfx, and the function call path is: cfcnfg_linkup_rsp (acquire the lock by rcu_read_lock) cfctrl_linkdown_req cfpkt_create cfpkt_create_pfx alloc_skb(GFP_KERNEL) --> may sleep cfserl_receive (acquire the lock by rcu_read_lock) cfpkt_split cfpkt_create_pfx alloc_skb(GFP_KERNEL) --> may sleep There is "in_interrupt" in cfpkt_create_pfx to decide use "GFP_KERNEL" or "GFP_ATOMIC". In this situation, "GFP_KERNEL" is used because the function is called under a rcu read lock, instead in interrupt. To fix it, only "GFP_ATOMIC" is used in cfpkt_create_pfx. Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/pinctrl/sunxi')
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