git: kernel - Fix mmcsd read/write issues

Matthew Dillon dillon at
Fri Oct 28 22:18:07 PDT 2016

commit fd4b97583be1a1e57234713c25f6e81bc0411cb0
Author: Matthew Dillon <dillon at>
Date:   Fri Oct 28 21:48:11 2016 -0700

    kernel - Fix mmcsd read/write issues
    * b_resid was not being set to 0 on a successful read or write, resulting
      in random short-read and short-write returns for requests.  Fixing this
      fixes nominal block I/O via the mmcsd disk device.
    * bus/mmc now uses tsleep() instead of DELAY for the 10ms pause in
      request/command wait loops.
    * bus/mmc reduces the TIMEOUT from 10 seconds to 1 second after the first
      TIMEOUT, only increasing it back to 10 seconds when timeouts stop
      occurring.  This reduces boot-time delays when a mmc port is dead or
      powered down.

Summary of changes:
 sys/bus/mmc/mmc.c          | 28 +++++++++++++++++++++++++---
 sys/dev/disk/mmcsd/mmcsd.c |  2 ++
 2 files changed, 27 insertions(+), 3 deletions(-)

DragonFly BSD source repository

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