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| author |   Florin Malita <fmalita@gmail.com> | 2005-11-12 22:09:22 +0000 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2005-11-12 22:09:22 +0000 |
| commit | 270c7a721548d116d9e054f48469e75cb0f35288 (patch) | |
| tree | 48bbdab0e66424b8faa1ad95190e2315261e936a /drivers/serial | |
| parent | [SERIAL] Claim Wacom tablet device on HP tc1100 tablet (diff) | |
| download | linux-dev-270c7a721548d116d9e054f48469e75cb0f35288.tar.xz linux-dev-270c7a721548d116d9e054f48469e75cb0f35288.zip | |
[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
[<c0022cdc>] (dump_stack+0x0/0x14) [<c00dc338>] (spin_bug+0x0/0xbc)
[<c00dc6b0>] (_raw_spin_lock+0x0/0x170) r8 = 00000007 r7 = C02FE0070
[<c018a2a8>] (_spin_lock_irqsave+0x0/0x24) r4 = C0205F20
[<c0112110>] (sa1100_start_tx+0x0/0x40) r4 = C038C000
[<c010ee38>] (__uart_start+0x0/0x5c) [<c010ee94>] (uart_start+0x0/0x3
[<c010f1d0>] (uart_write+0x0/0xdc) [<c00fee34>] (write_chan+0x0/0x370
Signed-off-by: Florin Malita <fmalita@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/sa1100.c | 4 |
1 files changed, 1 insertions, 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); } /* |