Zhe Weng e4721cef5c usrsock_rpmsg_server: Add net_lock to combine get_tx_payload and recvfrom in recvfrom_handler ... A dead lock may happen before this patch: rptun thread (usrsock_rpmsg_recvfrom_handler): Gets all tx payload but waiting net_lock in psock_recvfrom net driver thread (higher priority): Receives a packet, holding net_lock, calling usrsock_rpmsg_send_event But no tx buffer left, so rpmsg_send blocks, and won't release net_lock In short: Rptun: Hold all `tx_payload_buffer` -> want `net_lock` Driver: Hold `net_lock` -> want `tx_payload_buffer` This patch use net_lock to combine get_tx_payload and recvfrom together, then: - If it's waiting net_lock, tx payload will not be held, other threads may get tx buffer and do their work. - If net_lock is got, it won't be disturbed before finish receiving, then tx payload won't have chance to be blocked before releasing. Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>		2023-09-14 14:32:40 +08:00
..
CMakeLists.txt	build: add initial cmake build system	2023-07-08 13:50:48 +08:00
Kconfig	move usrsock to kernel space	2023-01-11 15:14:03 +08:00
Make.defs	move usrsock to kernel space	2023-01-11 15:14:03 +08:00
usrsock_dev.c	fs/inode: remove all unnecessary check for filep/inode	2023-08-29 09:47:11 +08:00
usrsock_rpmsg.c	net: consistent the net sem wait naming conversion	2023-01-15 12:31:30 -03:00
usrsock_rpmsg_server.c	usrsock_rpmsg_server: Add net_lock to combine get_tx_payload and recvfrom in recvfrom_handler	2023-09-14 14:32:40 +08:00