Duoming Zhou 23dd458135 NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc ... 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>		2022-05-17 17:55:53 -07:00
..
core.c	nfc: nci: add flush_workqueue to prevent uaf	2022-04-13 14:44:44 +01:00
data.c	NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc	2022-05-17 17:55:53 -07:00
hci.c	NFC: nci: fix sleep in atomic context bugs caused by nci_skb_alloc	2022-05-17 17:55:53 -07:00
Kconfig
lib.c
Makefile
ntf.c
rsp.c
spi.c
uart.c	tty: remove file from tty_ldisc_ops::ioctl and compat_ioctl	2021-11-25 18:36:27 +01:00