ipack/devices/ipoctal: protect the channel data processing with a spinlock
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 <siglesias@igalia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -191,6 +191,8 @@ static void ipoctal_irq_channel(struct ipoctal_channel *channel)
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tty = tty_port_tty_get(&channel->tty_port);
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if (!tty)
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return;
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spin_lock(&channel->lock);
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/* The HW is organized in pair of channels. See which register we need
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* to read from */
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isr = ioread8(&channel->block_regs->r.isr);
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@ -216,6 +218,7 @@ static void ipoctal_irq_channel(struct ipoctal_channel *channel)
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tty_flip_buffer_push(tty);
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tty_kref_put(tty);
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spin_unlock(&channel->lock);
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}
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static irqreturn_t ipoctal_irq_handler(void *arg)
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