mxcmmc driver hangs on sync

[Erik Oomen]

>> We've had the same problems for various kernels and mxcmmc modifications. The following fixed it.  We applied it to the 2.6.28 kernel and have been writing and reading *many* Gigabytes without a problem. 
> 
> Interesting. Did you try to push this back to mainline?
> 
> Daniel

No, at that time we where not sure this patch was a fix. Let's see if this solves Morgan's problems.

Erik.