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Diffstat (limited to 'sound/soc/sof/intel/hda-ipc.c')
-rw-r--r--sound/soc/sof/intel/hda-ipc.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/sound/soc/sof/intel/hda-ipc.c b/sound/soc/sof/intel/hda-ipc.c
index 73ead70..51b2851 100644
--- a/sound/soc/sof/intel/hda-ipc.c
+++ b/sound/soc/sof/intel/hda-ipc.c
@@ -72,7 +72,6 @@ void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
struct snd_sof_ipc_msg *msg = sdev->msg;
struct sof_ipc_reply reply;
struct sof_ipc_cmd_hdr *hdr;
- unsigned long flags;
int ret = 0;
/*
@@ -84,7 +83,6 @@ void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
dev_warn(sdev->dev, "unexpected ipc interrupt raised!\n");
return;
}
- spin_lock_irqsave(&sdev->ipc_lock, flags);
hdr = msg->msg_data;
if (hdr->cmd == (SOF_IPC_GLB_PM_MSG | SOF_IPC_PM_CTX_SAVE)) {
@@ -123,7 +121,6 @@ void hda_dsp_ipc_get_reply(struct snd_sof_dev *sdev)
out:
msg->reply_error = ret;
- spin_unlock_irqrestore(&sdev->ipc_lock, flags);
}
static bool hda_dsp_ipc_is_sof(uint32_t msg)
@@ -172,6 +169,18 @@ irqreturn_t hda_dsp_ipc_irq_thread(int irq, void *context)
HDA_DSP_REG_HIPCCTL,
HDA_DSP_REG_HIPCCTL_DONE, 0);
+ /*
+ * Make sure the interrupt thread cannot be preempted between
+ * waking up the sender and re-enabling the interrupt. Also
+ * protect against a theoretical race with sof_ipc_tx_message():
+ * if the DSP is fast enough to receive an IPC message, reply to
+ * it, and the host interrupt processing calls this function on
+ * a different core from the one, where the sending is taking
+ * place, the message might not yet be marked as expecting a
+ * reply.
+ */
+ spin_lock_irq(&sdev->ipc_lock);
+
/* handle immediate reply from DSP core - ignore ROM messages */
if (hda_dsp_ipc_is_sof(msg)) {
hda_dsp_ipc_get_reply(sdev);
@@ -187,6 +196,8 @@ irqreturn_t hda_dsp_ipc_irq_thread(int irq, void *context)
/* set the done bit */
hda_dsp_ipc_dsp_done(sdev);
+ spin_unlock_irq(&sdev->ipc_lock);
+
ret = IRQ_HANDLED;
}