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ASoC: Intel: Fix race condition in IPC rx list 

Since there are multiple IPCs being sent in a short span of time, there
is a possibility of more than one message being on the Rx list after
receiving response from firmware. In such cases, when the first
notification of interrupt from firmware is received, driver retrieves
the message from the Rx list but does not delete it from the list till
the next lock. In the meantime, when another interrupt is received from
the firmware, driver is reading the previous message again since the
previous message has not been removed from the list.

Signed-off-by: Gustaw Lewandowski <gustaw.lewandowski@intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
alistair/sunxi64-5.4-dsi
Gustaw Lewandowski 2019-06-13 21:04:33 +02:00 committed by Mark Brown
parent 078759399f
commit 26ae204908
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GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
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2
sound/soc/intel/skylake/skl-sst-ipc.c
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@ -344,6 +344,7 @@ static struct ipc_message *skl_ipc_reply_get_msg(struct sst_generic_ipc *ipc,
msg = list_first_entry(&ipc->rx_list, struct ipc_message, list);
list_del(&msg->list);
out:
return msg;
@ -488,7 +489,6 @@ void skl_ipc_process_reply(struct sst_generic_ipc *ipc,
}
spin_lock_irqsave(&ipc->dsp->spinlock, flags);
list_del(&msg->list);
sst_ipc_tx_msg_reply_complete(ipc, msg);
spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
}