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authorJohan Hovold <johan@kernel.org>2021-07-14 11:04:27 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-07-21 13:53:26 +0300
commit853a9ae29e978d37f5dfa72622a68c9ae3d7fa89 (patch)
treec3f2b62c6447e6b7fae006107281233aa99dfcce
parentcc9ca4d95846cbbece48d9cd385550f8fba6a3c1 (diff)
downloadlinux-853a9ae29e978d37f5dfa72622a68c9ae3d7fa89.tar.xz
serial: 8250: fix handle_irq locking
The 8250 handle_irq callback is not just called from the interrupt handler but also from a timer callback when polling (e.g. for ports without an interrupt line). Consequently the callback must explicitly disable interrupts to avoid a potential deadlock with another interrupt in polled mode. Add back an irqrestore-version of the sysrq port-unlock helper and use it in the 8250 callbacks that need it. Fixes: 75f4e830fa9c ("serial: do not restore interrupt state in sysrq helper") Cc: stable@vger.kernel.org # 5.13 Cc: Joel Stanley <joel@jms.id.au> Cc: Andrew Jeffery <andrew@aj.id.au> Reported-by: kernel test robot <oliver.sang@intel.com> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20210714080427.28164-1-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/serial/8250/8250_aspeed_vuart.c5
-rw-r--r--drivers/tty/serial/8250/8250_fsl.c5
-rw-r--r--drivers/tty/serial/8250/8250_port.c5
-rw-r--r--include/linux/serial_core.h24
4 files changed, 33 insertions, 6 deletions
diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c
index 4caab8714e2c..2350fb3bb5e4 100644
--- a/drivers/tty/serial/8250/8250_aspeed_vuart.c
+++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c
@@ -329,6 +329,7 @@ static int aspeed_vuart_handle_irq(struct uart_port *port)
{
struct uart_8250_port *up = up_to_u8250p(port);
unsigned int iir, lsr;
+ unsigned long flags;
unsigned int space, count;
iir = serial_port_in(port, UART_IIR);
@@ -336,7 +337,7 @@ static int aspeed_vuart_handle_irq(struct uart_port *port)
if (iir & UART_IIR_NO_INT)
return 0;
- spin_lock(&port->lock);
+ spin_lock_irqsave(&port->lock, flags);
lsr = serial_port_in(port, UART_LSR);
@@ -370,7 +371,7 @@ static int aspeed_vuart_handle_irq(struct uart_port *port)
if (lsr & UART_LSR_THRE)
serial8250_tx_chars(up);
- uart_unlock_and_check_sysrq(port);
+ uart_unlock_and_check_sysrq_irqrestore(port, flags);
return 1;
}
diff --git a/drivers/tty/serial/8250/8250_fsl.c b/drivers/tty/serial/8250/8250_fsl.c
index 4e75d2e4f87c..fc65a2293ce9 100644
--- a/drivers/tty/serial/8250/8250_fsl.c
+++ b/drivers/tty/serial/8250/8250_fsl.c
@@ -30,10 +30,11 @@ struct fsl8250_data {
int fsl8250_handle_irq(struct uart_port *port)
{
unsigned char lsr, orig_lsr;
+ unsigned long flags;
unsigned int iir;
struct uart_8250_port *up = up_to_u8250p(port);
- spin_lock(&up->port.lock);
+ spin_lock_irqsave(&up->port.lock, flags);
iir = port->serial_in(port, UART_IIR);
if (iir & UART_IIR_NO_INT) {
@@ -82,7 +83,7 @@ int fsl8250_handle_irq(struct uart_port *port)
up->lsr_saved_flags = orig_lsr;
- uart_unlock_and_check_sysrq(&up->port);
+ uart_unlock_and_check_sysrq_irqrestore(&up->port, flags);
return 1;
}
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 2e7000f79b03..1da29a219842 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -1899,11 +1899,12 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
unsigned char status;
struct uart_8250_port *up = up_to_u8250p(port);
bool skip_rx = false;
+ unsigned long flags;
if (iir & UART_IIR_NO_INT)
return 0;
- spin_lock(&port->lock);
+ spin_lock_irqsave(&port->lock, flags);
status = serial_port_in(port, UART_LSR);
@@ -1929,7 +1930,7 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
(up->ier & UART_IER_THRI))
serial8250_tx_chars(up);
- uart_unlock_and_check_sysrq(port);
+ uart_unlock_and_check_sysrq_irqrestore(port, flags);
return 1;
}
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 52d7fb92a69d..c58cc142d23f 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -518,6 +518,25 @@ static inline void uart_unlock_and_check_sysrq(struct uart_port *port)
if (sysrq_ch)
handle_sysrq(sysrq_ch);
}
+
+static inline void uart_unlock_and_check_sysrq_irqrestore(struct uart_port *port,
+ unsigned long flags)
+{
+ int sysrq_ch;
+
+ if (!port->has_sysrq) {
+ spin_unlock_irqrestore(&port->lock, flags);
+ return;
+ }
+
+ sysrq_ch = port->sysrq_ch;
+ port->sysrq_ch = 0;
+
+ spin_unlock_irqrestore(&port->lock, flags);
+
+ if (sysrq_ch)
+ handle_sysrq(sysrq_ch);
+}
#else /* CONFIG_MAGIC_SYSRQ_SERIAL */
static inline int uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
{
@@ -531,6 +550,11 @@ static inline void uart_unlock_and_check_sysrq(struct uart_port *port)
{
spin_unlock(&port->lock);
}
+static inline void uart_unlock_and_check_sysrq_irqrestore(struct uart_port *port,
+ unsigned long flags)
+{
+ spin_unlock_irqrestore(&port->lock, flags);
+}
#endif /* CONFIG_MAGIC_SYSRQ_SERIAL */
/*