Commit 81c4b570 authored Nov 17, 2017 by Mukesh Kumar Savaliya

serial: msm_geni_serial: set unmapped rx dma buffer to NULL



Set the Rx buffer to NULL post un-mapping it from the iommu as part
of ISR handling. Otherwise the buffer pointer being non-NULL would
cause unmapped access while stop_rx gets called.

Change-Id: I9f2e89ea36e723d93d524bd46827c6ca4395e790
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>

parent 4728a0a0

drivers/tty/serial/msm_geni_serial.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1286,6 +1286,8 @@ static int msm_geni_serial_handle_dma_rx(struct uart_port *uport, bool drop_rx)

		geni_se_rx_dma_unprep(msm_port->wrapper_dev, msm_port->rx_dma,
		DMA_RX_BUF_SIZE);
		msm_port->rx_dma = (dma_addr_t)NULL;

		rx_bytes = geni_read_reg_nolog(uport->membase, SE_DMA_RX_LEN_IN);
		if (unlikely(!msm_port->rx_buf)) {
		IPC_LOG_MSG(msm_port->ipc_log_rx, "%s: NULL Rx_buf\n",