Duoming Zhou 2372405955 NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc ... [ Upstream commit 23dd458135 ] There are sleep in atomic context bugs when the request to secure element of st-nci is timeout. The root cause is that nci_skb_alloc with GFP_KERNEL parameter is called in st_nci_se_wt_timeout which is a timer handler. The call paths that could trigger bugs are shown below: (interrupt context 1) st_nci_se_wt_timeout nci_hci_send_event nci_hci_send_data nci_skb_alloc(..., GFP_KERNEL) //may sleep (interrupt context 2) st_nci_se_wt_timeout nci_hci_send_event nci_hci_send_data nci_send_data nci_queue_tx_data_frags nci_skb_alloc(..., GFP_KERNEL) //may sleep This patch changes allocation mode of nci_skb_alloc from GFP_KERNEL to GFP_ATOMIC in order to prevent atomic context sleeping. The GFP_ATOMIC flag makes memory allocation operation could be used in atomic context. Fixes: ed06aeefda ("nfc: st-nci: Rename st21nfcb to st-nci") Signed-off-by: Duoming Zhou <duoming@zju.edu.cn> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://lore.kernel.org/r/20220517012530.75714-1-duoming@zju.edu.cn Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-05-25 09:57:32 +02:00
..
hci	nfc: constify local pointer variables	2021-07-30 17:22:52 +02:00
nci	NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc	2022-05-25 09:57:32 +02:00
af_nfc.c	nfc: fix error handling of nfc_proto_register()	2021-10-13 17:32:38 -07:00
core.c	nfc: replace improper check device_is_registered() in netlink related functions	2022-05-12 12:30:10 +02:00
digital.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288	2019-06-05 17:36:37 +02:00
digital_core.c	NFC: digital: fix possible memory leak in digital_tg_listen_mdaa()	2021-10-13 17:44:29 -07:00
digital_dep.c	net:nfc:digital: Fix a double free in digital_tg_recv_dep_req	2021-04-27 15:36:10 -07:00
digital_technology.c	NFC: digital: fix possible memory leak in digital_in_send_sdd_req()	2021-10-13 17:44:29 -07:00
Kconfig	net: remove redundant 'depends on NET'	2021-01-27 17:04:12 -08:00
llcp.h	nfc: constify several pointers to u8, char and sk_buff	2021-07-30 17:22:52 +02:00
llcp_commands.c	nfc: constify several pointers to u8, char and sk_buff	2021-07-30 17:22:52 +02:00
llcp_core.c	nfc: constify several pointers to u8, char and sk_buff	2021-07-30 17:22:52 +02:00
llcp_sock.c	nfc: llcp: fix NULL error pointer dereference on sendmsg() after failed bind()	2022-01-27 11:02:48 +01:00
Makefile
netlink.c	NFC: netlink: fix sleep in atomic bug when firmware download timeout	2022-05-12 12:30:10 +02:00
nfc.h	nfc: constify several pointers to u8, char and sk_buff	2021-07-30 17:22:52 +02:00
rawsock.c	net: in_irq() cleanup	2021-08-13 14:09:19 -07:00