path: root/Documentation
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authorAlan Stern <stern@rowland.harvard.edu>2009-12-07 16:39:16 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 11:55:26 -0800
commita0bb108112a872c0b0c4b3ef4974f95fb75b155d (patch)
tree86f7327949289b70960f57b07b99054e240a91e4 /Documentation
parent8e4ceb38eb5bbaef22fc00abe9bc11e26bea2ab5 (diff)
USB: usb-storage: add BAD_SENSE flag
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>
Diffstat (limited to 'Documentation')
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 777dc8a32df8..3f886e298f62 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2663,6 +2663,8 @@ 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