From 4708384f35ff6e5aac3dd70555f8765ecf9b6d56 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Tue, 19 Mar 2019 17:07:37 +0200 Subject: [PATCH] thunderbolt: Block reads and writes if switch is unplugged If switch is already disconnected there is no point sending it commands and waiting for timeout. Instead in that case return error immediately. Signed-off-by: Mika Westerberg --- drivers/thunderbolt/tb.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index aea668c..496dcd0 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -277,6 +277,8 @@ static inline struct tb_port *tb_port_at(u64 route, struct tb_switch *sw) static inline int tb_sw_read(struct tb_switch *sw, void *buffer, enum tb_cfg_space space, u32 offset, u32 length) { + if (sw->is_unplugged) + return -ENODEV; return tb_cfg_read(sw->tb->ctl, buffer, tb_route(sw), @@ -289,6 +291,8 @@ static inline int tb_sw_read(struct tb_switch *sw, void *buffer, static inline int tb_sw_write(struct tb_switch *sw, void *buffer, enum tb_cfg_space space, u32 offset, u32 length) { + if (sw->is_unplugged) + return -ENODEV; return tb_cfg_write(sw->tb->ctl, buffer, tb_route(sw), @@ -301,6 +305,8 @@ static inline int tb_sw_write(struct tb_switch *sw, void *buffer, static inline int tb_port_read(struct tb_port *port, void *buffer, enum tb_cfg_space space, u32 offset, u32 length) { + if (port->sw->is_unplugged) + return -ENODEV; return tb_cfg_read(port->sw->tb->ctl, buffer, tb_route(port->sw), @@ -313,6 +319,8 @@ static inline int tb_port_read(struct tb_port *port, void *buffer, static inline int tb_port_write(struct tb_port *port, const void *buffer, enum tb_cfg_space space, u32 offset, u32 length) { + if (port->sw->is_unplugged) + return -ENODEV; return tb_cfg_write(port->sw->tb->ctl, buffer, tb_route(port->sw), -- 2.7.4