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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2006-10-01 17:17:40 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-10-01 17:17:40 +0100 |
| commit | a6b93a908508810c5d51dd9b390283345af6f2d9 (patch) | |
| tree | 71b48d3a659a025ebf333abfeec7b828becb60cb /drivers/serial | |
| parent | fe59d5372ae719ca4550958f1e5bb4dd6eeac9cd (diff) | |
| download | lwn-a6b93a908508810c5d51dd9b390283345af6f2d9.tar.gz lwn-a6b93a908508810c5d51dd9b390283345af6f2d9.zip | |
[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>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/serial_core.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index d814bb1dcb05..397147a7054f 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); |