svn commit: r358450 - head/sys/dev/mmc/host

[Emmanuel Vadot]

Author: manu
Date: Fri Feb 28 21:31:40 2020
New Revision: 358450
URL: https://svnweb.freebsd.org/changeset/base/358450

Log:
  mmc: dwmmc: Fix off by one error
  
  The IVAR_MAX_DATA is supposed to have the number of descriptor X the mmc
  block size and desc_count contain all this information + 1.
  
  Reported by:	phk
  MFC after:	1 week

Modified:
  head/sys/dev/mmc/host/dwmmc.c

Modified: head/sys/dev/mmc/host/dwmmc.c
==============================================================================
--- head/sys/dev/mmc/host/dwmmc.c	Fri Feb 28 21:13:15 2020	(r358449)
+++ head/sys/dev/mmc/host/dwmmc.c	Fri Feb 28 21:31:40 2020	(r358450)
@@ -1278,7 +1278,7 @@ dwmmc_read_ivar(device_t bus, device_t child, int whic
 		*(int *)result = sc->host.caps;
 		break;
 	case MMCBR_IVAR_MAX_DATA:
-		*(int *)result = sc->desc_count;
+		*(int *)result = sc->desc_count - 1;
 		break;
 	case MMCBR_IVAR_TIMING:
 		*(int *)result = sc->host.ios.timing;