svn commit: r333553 - head/sys/arm/allwinner

[Emmanuel Vadot]

Author: manu
Date: Sat May 12 13:12:26 2018
New Revision: 333553
URL: https://svnweb.freebsd.org/changeset/base/333553

Log:
  aw_mmc: Read interrupt register value before writing to it
  
  Reported by: jmcneill

Modified:
  head/sys/arm/allwinner/aw_mmc.c

Modified: head/sys/arm/allwinner/aw_mmc.c
==============================================================================
--- head/sys/arm/allwinner/aw_mmc.c	Sat May 12 12:57:34 2018	(r333552)
+++ head/sys/arm/allwinner/aw_mmc.c	Sat May 12 13:12:26 2018	(r333553)
@@ -450,6 +450,7 @@ aw_mmc_prepare_dma(struct aw_mmc_softc *sc)
 	    AW_MMC_DMAC_IDMAC_IDMA_ON | AW_MMC_DMAC_IDMAC_FIX_BURST);
 
 	/* Enable RX or TX DMA interrupt */
+	val = AW_MMC_READ_4(sc, AW_MMC_IDIE);
 	if (cmd->data->flags & MMC_DATA_WRITE)
 		val |= AW_MMC_IDST_TX_INT;
 	else