diff options
| -rw-r--r-- | drivers/soc/qcom/glink_smem_native_xprt.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/soc/qcom/glink_smem_native_xprt.c b/drivers/soc/qcom/glink_smem_native_xprt.c index 4407dfbc45df..df94bbc6b696 100644 --- a/drivers/soc/qcom/glink_smem_native_xprt.c +++ b/drivers/soc/qcom/glink_smem_native_xprt.c @@ -539,6 +539,12 @@ static int fifo_write(struct edge_info *einfo, const void *data, int len) uint32_t write_index = einfo->tx_ch_desc->write_index; len = fifo_write_body(einfo, data, len, &write_index); + + /* All data writes need to be flushed to memory before the write index + * is updated. This protects against a race condition where the remote + * reads stale data because the write index was written before the data. + */ + wmb(); einfo->tx_ch_desc->write_index = write_index; send_irq(einfo); @@ -574,6 +580,12 @@ static int fifo_write_complex(struct edge_info *einfo, len1 = fifo_write_body(einfo, data1, len1, &write_index); len2 = fifo_write_body(einfo, data2, len2, &write_index); len3 = fifo_write_body(einfo, data3, len3, &write_index); + + /* All data writes need to be flushed to memory before the write index + * is updated. This protects against a race condition where the remote + * reads stale data because the write index was written before the data. + */ + wmb(); einfo->tx_ch_desc->write_index = write_index; send_irq(einfo); |