f146e872eb
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>
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| caif_dev.c | ||
| caif_socket.c | ||
| caif_usb.c | ||
| cfcnfg.c | ||
| cfctrl.c | ||
| cfdbgl.c | ||
| cfdgml.c | ||
| cffrml.c | ||
| cfmuxl.c | ||
| cfpkt_skbuff.c | ||
| cfrfml.c | ||
| cfserl.c | ||
| cfsrvl.c | ||
| cfutill.c | ||
| cfveil.c | ||
| cfvidl.c | ||
| chnl_net.c | ||