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authorPardha Saradhi K <pardha.saradhi.kesapragada@intel.com>2017-05-15 19:44:29 +0530
committerMark Brown <broonie@kernel.org>2017-05-24 18:25:12 +0100
commit5cd1f5c32132101955d7f0e1955249a84f9b6fd9 (patch)
tree49661588fbe3b0e3b083b45bda00e654f21c6e5c /sound
parentab1b732d53c18f26f51cad49371be3244fe67504 (diff)
ASoC: Intel: Skylake: Fix IPC rx_list corruption
In SKL+ platforms, all IPC commands are serialised, i.e. the driver sends a new IPC to DSP, only after receiving a reply from the firmware for the current IPC. Hence it seems apparent that there is only a single modifier of the IPC RX List. However, during an IPC timeout case in a multithreaded environment, there is a possibility of the list element being deleted two times if not properly protected. So, use spin lock save/restore to prevent rx_list corruption. Signed-off-by: Pardha Saradhi K <pardha.saradhi.kesapragada@intel.com> Signed-off-by: Subhransu S. Prusty <subhransu.s.prusty@intel.com> Acked-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/soc/intel/skylake/skl-sst-ipc.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/sound/soc/intel/skylake/skl-sst-ipc.c b/sound/soc/intel/skylake/skl-sst-ipc.c
index 58c525096a7c..498b15345b1a 100644
--- a/sound/soc/intel/skylake/skl-sst-ipc.c
+++ b/sound/soc/intel/skylake/skl-sst-ipc.c
@@ -413,8 +413,11 @@ static void skl_ipc_process_reply(struct sst_generic_ipc *ipc,
u32 reply = header.primary & IPC_GLB_REPLY_STATUS_MASK;
u64 *ipc_header = (u64 *)(&header);
struct skl_sst *skl = container_of(ipc, struct skl_sst, ipc);
+ unsigned long flags;
+ spin_lock_irqsave(&ipc->dsp->spinlock, flags);
msg = skl_ipc_reply_get_msg(ipc, *ipc_header);
+ spin_unlock_irqrestore(&ipc->dsp->spinlock, flags);
if (msg == NULL) {
dev_dbg(ipc->dev, "ipc: rx list is empty\n");
return;
@@ -456,8 +459,10 @@ static 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);
}
irqreturn_t skl_dsp_irq_thread_handler(int irq, void *context)

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