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| author | Samuel Iglesias Gonsalvez <siglesias@igalia.com> | 2012-12-10 11:50:05 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-15 18:24:38 -0800 |
| commit | e7e664fd688a4a882ce571575ad721203f0cd584 (patch) | |
| tree | 4acbf6cde6898c71af252673db206ca12658f4fe /drivers/ipack | |
| parent | 21d27ed4616c9a7f2886c4159b4c409f73f96e76 (diff) | |
| download | lwn-e7e664fd688a4a882ce571575ad721203f0cd584.tar.gz lwn-e7e664fd688a4a882ce571575ad721203f0cd584.zip | |
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>
Diffstat (limited to 'drivers/ipack')
| -rw-r--r-- | drivers/ipack/devices/ipoctal.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c index 9cd5572457ff..5ce2c4c5bb32 100644 --- a/drivers/ipack/devices/ipoctal.c +++ b/drivers/ipack/devices/ipoctal.c @@ -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) |