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USB: usb-storage: add BAD_SENSE flag

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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>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2009-12-07 16:39:16 -05:00
committed by Greg Kroah-Hartman
parent 8e4ceb38eb
commit a0bb108112
5 changed files with 28 additions and 5 deletions
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4
include/linux/usb_usual.h
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@@ -56,7 +56,9 @@
US_FLAG(SANE_SENSE, 0x00008000) \
/* Sane Sense (> 18 bytes) */ \
US_FLAG(CAPACITY_OK, 0x00010000) \
/* READ CAPACITY response is correct */
/* READ CAPACITY response is correct */ \
US_FLAG(BAD_SENSE, 0x00020000) \
/* Bad Sense (never more than 18 bytes) */
#define US_FLAG(name, value) US_FL_##name = value ,
enum { US_DO_ALL_FLAGS };