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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2006-10-01 17:17:40 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-10-01 17:17:40 +0100
commita6b93a908508810c5d51dd9b390283345af6f2d9 (patch)
tree71b48d3a659a025ebf333abfeec7b828becb60cb
parentfe59d5372ae719ca4550958f1e5bb4dd6eeac9cd (diff)
downloadop-kernel-dev-a6b93a908508810c5d51dd9b390283345af6f2d9.zip
op-kernel-dev-a6b93a908508810c5d51dd9b390283345af6f2d9.tar.gz
[SERIAL] Fix oops when removing suspended serial port
A serial card might have been removed when the system is resumed. This results in a suspended port being shut down, which results in the ports shutdown method being called twice in a row. This causes BUGs. Avoid this by tracking the suspended state separately from the initialised state. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--drivers/serial/serial_core.c9
-rw-r--r--include/linux/serial_core.h1
2 files changed, 8 insertions, 2 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index d814bb1..397147a 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -1940,6 +1940,9 @@ int uart_suspend_port(struct uart_driver *drv, struct uart_port *port)
if (state->info && state->info->flags & UIF_INITIALIZED) {
const struct uart_ops *ops = port->ops;
+ state->info->flags = (state->info->flags & ~UIF_INITIALIZED)
+ | UIF_SUSPENDED;
+
spin_lock_irq(&port->lock);
ops->stop_tx(port);
ops->set_mctrl(port, 0);
@@ -2006,7 +2009,7 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *port)
console_start(port->cons);
}
- if (state->info && state->info->flags & UIF_INITIALIZED) {
+ if (state->info && state->info->flags & UIF_SUSPENDED) {
const struct uart_ops *ops = port->ops;
int ret;
@@ -2018,15 +2021,17 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *port)
ops->set_mctrl(port, port->mctrl);
ops->start_tx(port);
spin_unlock_irq(&port->lock);
+ state->info->flags |= UIF_INITIALIZED;
} else {
/*
* Failed to resume - maybe hardware went away?
* Clear the "initialized" flag so we won't try
* to call the low level drivers shutdown method.
*/
- state->info->flags &= ~UIF_INITIALIZED;
uart_shutdown(state);
}
+
+ state->info->flags &= ~UIF_SUSPENDED;
}
mutex_unlock(&state->mutex);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 86501a3..f9fdf97 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -319,6 +319,7 @@ struct uart_info {
#define UIF_CTS_FLOW ((__force uif_t) (1 << 26))
#define UIF_NORMAL_ACTIVE ((__force uif_t) (1 << 29))
#define UIF_INITIALIZED ((__force uif_t) (1 << 31))
+#define UIF_SUSPENDED ((__force uif_t) (1 << 30))
int blocked_open;
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