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| author | Alan Stern <stern@rowland.harvard.edu> | 2009-12-07 16:39:16 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-18 14:03:59 -0800 |
| commit | 3d5536bccf57b761f41f0ac1d7453e9997b4fdbf (patch) | |
| tree | fd2186066f95460faa7a884b5d2c57c593efec45 /Documentation | |
| parent | f4c0cf18d2b21dd614662c3b95ce0ffd0a4aa881 (diff) | |
USB: usb-storage: add BAD_SENSE flag
commit a0bb108112a872c0b0c4b3ef4974f95fb75b155d upstream.
This patch (as1311) fixes a problem in usb-storage: Some devices are
pretty broken when it comes to reporting sense data. The information
they send back indicates that they have more than 18 bytes of sense
data available, but when the system asks for more than 18 they fail or
hang. The symptom is that probing fails with multiple resets.
The patch adds a new BAD_SENSE flag to indicate that usb-storage
should never ask for more than 18 bytes of sense data. The flag can
be set in an unusual_devs entry or via the "quirks=" module parameter,
and it is set automatically whenever a REQUEST SENSE command for more
than 18 bytes fails or times out.
An unusual_devs entry is added for the Agfa photo frame, which uses a
Prolific chip having this bug.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Daniel Kukula <daniel.kuku@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 9107b387e91..5bc4eaaa5b7 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -2645,6 +2645,8 @@ and is between 256 and 4096 characters. It is defined in the file to a common usb-storage quirk flag as follows: a = SANE_SENSE (collect more than 18 bytes of sense data); + b = BAD_SENSE (don't collect more than 18 + bytes of sense data); c = FIX_CAPACITY (decrease the reported device capacity by one sector); h = CAPACITY_HEURISTICS (decrease the |