[PATCH 0/3] scsi: usb-storage: hide errors for five devices

[Paul Bolle <pebolle@tiscali.nl>]

0) Five USB memory sticks I happen to have will generate sets of two
errors when inserted. These sets are either:
    [...] Asking for cache data failed
    [...] Assuming drive cache: write through

or:
    [...] No Caching mode page present
    [...] Assuming drive cache: write through

These errors are generated by the SCSI stack (and printed thrice).

1) These patches try to hide those errors by:
- downgrading one error to a notice; and
- setting the NO_WP_DETECT quirk for these five devices.

2) Review of these patches is appreciated. Please note that the first
patch downgrades the error also for code paths that I apparently never
trigger, so that one especially needs additional thought, testing, etc.
 
3) It's not entirely clear which names one should use in the
UNUSUAL_DEV() macro. I just picked the most neutral names that showed up
for the devices in the logs.

4) Tested on v3.3.4, but applies cleanly to v3.4-rc6.

Paul Bolle (3):
  scsi: downgrade "write through" error to notice
  usb-storage: use NO_WP_DETECT for two devices
  usb-storage: use NO_WP_DETECT for three devices

 drivers/scsi/sd.c                  |    2 +-
 drivers/usb/storage/unusual_devs.h |   22 ++++++++++++++++++++--
 2 files changed, 21 insertions(+), 3 deletions(-)

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1.7.7.6