[FS#1242] SATA broken on kernel 4.9 on mt7621

[LEDE Bugs]

The following task has a new comment added:

FS#1242 - SATA broken on kernel 4.9 on mt7621
User who did this - Waldemar Konik (valdi74)

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I can confirm this bug on Xiaomi Mi Router 3G and USB SATA HDD. Big files (10 GB) downloaded are sometimes (20-30% files) broken - md5sum don't match. There was no log entry when the error occurred. Tested with:
- three different Xiaomi Mi 3G routers
- two USB HDDs
- four different LEDE snapshots from the last 7 weeks (kernel 4.9)
- pyLoad and wget download managers
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1242#comment4027