From 270c7a721548d116d9e054f48469e75cb0f35288 Mon Sep 17 00:00:00 2001 From: Florin Malita Date: Sat, 12 Nov 2005 22:09:22 +0000 Subject: [PATCH] [SERIAL] sa1100_start_tx spinlock recursion The serial core aquires the port spinlock before calling port->ops->start_tx(), so sa1100_start_tx() shouldn't try to lock it again. BUG: spinlock recursion on CPU#0, init/1 lock: c0205f20, .magic: dead4ead, .owner: init/1, .owner_cpu: 0 [] (dump_stack+0x0/0x14) [] (spin_bug+0x0/0xbc) [] (_raw_spin_lock+0x0/0x170) r8 = 00000007 r7 = C02FE0070 [] (_spin_lock_irqsave+0x0/0x24) r4 = C0205F20 [] (sa1100_start_tx+0x0/0x40) r4 = C038C000 [] (__uart_start+0x0/0x5c) [] (uart_start+0x0/0x3 [] (uart_write+0x0/0xdc) [] (write_chan+0x0/0x370 Signed-off-by: Florin Malita Signed-off-by: Russell King --- drivers/serial/sa1100.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/serial/sa1100.c b/drivers/serial/sa1100.c index fd9deee20e05..0e3daf6d7b50 100644 --- a/drivers/serial/sa1100.c +++ b/drivers/serial/sa1100.c @@ -156,7 +156,7 @@ static void sa1100_stop_tx(struct uart_port *port) } /* - * interrupts may not be disabled on entry + * port locked and interrupts disabled */ static void sa1100_start_tx(struct uart_port *port) { @@ -164,11 +164,9 @@ static void sa1100_start_tx(struct uart_port *port) unsigned long flags; u32 utcr3; - spin_lock_irqsave(&sport->port.lock, flags); utcr3 = UART_GET_UTCR3(sport); sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS); UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE); - spin_unlock_irqrestore(&sport->port.lock, flags); } /* -- 2.20.1