[PATCH 4/9] sa1111ps2: Use disable_irq_nosync() from within irq handlers.
From: Ben Nizette <hidden>
Date: 2009-04-16 05:56:21
Also in:
lkml
Subsystem:
input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Dmitry Torokhov, Linus Torvalds
disable_irq() should wait for all running handlers to complete before returning. As such, if it's used to disable an interrupt from that interrupt's handler it will deadlock. This replaces the dangerous instances with the _nosync() variant which doesn't have this problem. Signed-off-by: Ben Nizette <redacted> ---
diff --git a/drivers/input/serio/sa1111ps2.c b/drivers/input/serio/sa1111ps2.c
index 57953c0..f412c69 100644
--- a/drivers/input/serio/sa1111ps2.c
+++ b/drivers/input/serio/sa1111ps2.c@@ -77,7 +77,7 @@ static irqreturn_t ps2_txint(int irq, void *dev_id) spin_lock(&ps2if->lock); status = sa1111_readl(ps2if->base + SA1111_PS2STAT); if (ps2if->head == ps2if->tail) { - disable_irq(irq); + disable_irq_nosync(irq); /* done */ } else if (status & PS2STAT_TXE) { sa1111_writel(ps2if->buf[ps2if->tail], ps2if->base + SA1111_PS2DATA);
--
1.6.0.2