Merge "soc: qcom: glink: smem: Add wmb between data and write index" (c5d08418) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/soc/qcom/glink_smem_native_xprt.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -557,6 +557,12 @@ static int fifo_write(struct edge_info einfo, const void data, int len)
		len = fifo_write_body(einfo, data, len, &write_index);
		if (unlikely(len < 0))
		return len;

		/* 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);

		@@ -599,6 +605,11 @@ static int fifo_write_complex(struct edge_info *einfo,
		if (unlikely(len3 < 0))
		return len3;

		/* 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);