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ipack/devices/ipoctal: protect the channel data processing with a spinlock

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We protect important data such as TX buffer pointer, nb_bytes counter and status
registers of the device, from accessing several times at the same time.

Signed-off-by: Samuel Iglesias Gonsalvez <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Samuel Iglesias Gonsalvez 2012-12-10 11:50:05 +01:00 • committed by Greg Kroah-Hartman
commit e7e664fd68
1 changed files with 3 additions and 0 deletions
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3
drivers/ipack/devices/ipoctal.c
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@ -191,6 +191,8 @@ static void ipoctal_irq_channel(struct ipoctal_channel *channel)
tty = tty_port_tty_get(&channel->tty_port);
if (!tty)
return;
spin_lock(&channel->lock);
/* The HW is organized in pair of channels. See which register we need
* to read from */
isr = ioread8(&channel->block_regs->r.isr);
@ -216,6 +218,7 @@ static void ipoctal_irq_channel(struct ipoctal_channel *channel)
tty_flip_buffer_push(tty);
tty_kref_put(tty);
spin_unlock(&channel->lock);
}
static irqreturn_t ipoctal_irq_handler(void *arg)