diff options
| author | Johan Hovold <johan@kernel.org> | 2021-04-16 17:05:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-22 13:04:26 +0300 |
| commit | 75f4e830fa9c47637054a3b7201765f2a314bda2 (patch) | |
| tree | eee2f6223ed380cc8ed106f4342213c2ebef469e /drivers/tty/serial/8250/8250_omap.c | |
| parent | 86eb032675766e633ba1ad2902776533e8dd576b (diff) | |
| download | linux-75f4e830fa9c47637054a3b7201765f2a314bda2.tar.xz | |
serial: do not restore interrupt state in sysrq helper
The uart_unlock_and_check_sysrq() helper can be used to defer processing
of sysrq until the interrupt handler has released the port lock and is
about to return.
Since commit 81e2073c175b ("genirq: Disable interrupts for force
threaded handlers") interrupt handlers that are not explicitly requested
as threaded are always called with interrupts disabled and there is no
need to save the interrupt state when taking the port lock.
Instead of adding another sysrq helper for when the interrupt state has
not needlessly been saved, drop the state parameter from
uart_unlock_and_check_sysrq() and update its callers to no longer
explicitly disable interrupts in their interrupt handlers.
Cc: Joel Stanley <joel@jms.id.au>
Cc: Andrew Jeffery <andrew@aj.id.au>
Cc: Andy Gross <agross@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210416140557.25177-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/8250/8250_omap.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_omap.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index 23e0decde33e..8ac11eaeca51 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -1143,7 +1143,6 @@ static int omap_8250_dma_handle_irq(struct uart_port *port) struct uart_8250_port *up = up_to_u8250p(port); struct omap8250_priv *priv = up->port.private_data; unsigned char status; - unsigned long flags; u8 iir; serial8250_rpm_get(up); @@ -1154,7 +1153,7 @@ static int omap_8250_dma_handle_irq(struct uart_port *port) return IRQ_HANDLED; } - spin_lock_irqsave(&port->lock, flags); + spin_lock(&port->lock); status = serial_port_in(port, UART_LSR); @@ -1179,7 +1178,8 @@ static int omap_8250_dma_handle_irq(struct uart_port *port) } } - uart_unlock_and_check_sysrq(port, flags); + uart_unlock_and_check_sysrq(port); + serial8250_rpm_put(up); return 1; } |