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authorAlan Stern <stern@rowland.harvard.edu>2009-12-07 16:39:16 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-18 14:03:59 -0800
commit3d5536bccf57b761f41f0ac1d7453e9997b4fdbf (patch)
treefd2186066f95460faa7a884b5d2c57c593efec45 /Documentation
parentf4c0cf18d2b21dd614662c3b95ce0ffd0a4aa881 (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.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 9107b387e91f..5bc4eaaa5b7f 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