diff options
| author | Borislav Petkov <petkovbb@googlemail.com> | 2008-07-30 07:33:32 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-30 18:41:45 +0200 |
| commit | c389d27b5e643d745f55ffb939b1426060ba63d4 (patch) | |
| tree | aa7a4903fe58542a716a78e37d518d71727f9475 /drivers/serial/8250.c | |
| parent | markers: fix markers read barrier for multiple probes (diff) | |
| download | linux-c389d27b5e643d745f55ffb939b1426060ba63d4.tar.xz linux-c389d27b5e643d745f55ffb939b1426060ba63d4.zip | |
8250.c: port.lock is irq-safe
serial8250_startup() doesn't disable interrupts while taking the &up->port.lock
which might race against the interrupt handler serial8250_interrupt(), which
when entered, will deadlock waiting for the lock to be released.
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Tested-by: Ingo Molnar <mingo@elte.hu>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/serial/8250.c')
| -rw-r--r-- | drivers/serial/8250.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c index a97f1ae11f78..342e12fb1c25 100644 --- a/drivers/serial/8250.c +++ b/drivers/serial/8250.c @@ -1885,7 +1885,7 @@ static int serial8250_startup(struct uart_port *port) * the interrupt is enabled. Delays are necessary to * allow register changes to become visible. */ - spin_lock(&up->port.lock); + spin_lock_irqsave(&up->port.lock, flags); if (up->port.flags & UPF_SHARE_IRQ) disable_irq_nosync(up->port.irq); @@ -1901,7 +1901,7 @@ static int serial8250_startup(struct uart_port *port) if (up->port.flags & UPF_SHARE_IRQ) enable_irq(up->port.irq); - spin_unlock(&up->port.lock); + spin_unlock_irqrestore(&up->port.lock, flags); /* * If the interrupt is not reasserted, setup a timer to |