USB: usb-storage: add "quirks=" module parameter

This patch (as1163b) adds a "quirks=" module parameter to usb-storage.
This will allow people to make short-term changes to their
unusual_devs list without rebuilding the entire driver.  Testing will
become much easier, and less-sophisticated users will be able to
access their buggy devices after a simple config-file change instead
of having to wait for a new kernel release.

The patch also adds a documentation entry for usb-storage's
"delay_use" parameter, which has been around for years but but was
never listed among the kernel parameters.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 29 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 0b3f671..8eb6e35 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -91,6 +91,7 @@ parameter is applicable:
 	SUSPEND	System suspend states are enabled.
 	FTRACE	Function tracing enabled.
 	TS	Appropriate touchscreen support is enabled.
+	UMS	USB Mass Storage support is enabled.
 	USB	USB support is enabled.
 	USBHID	USB Human Interface Device support is enabled.
 	V4L	Video For Linux support is enabled.
@@ -2383,6 +2384,34 @@ and is between 256 and 4096 characters. It is defined in the file
 	usbhid.mousepoll=
 			[USBHID] The interval which mice are to be polled at.
 
+	usb-storage.delay_use=
+			[UMS] The delay in seconds before a new device is
+			scanned for Logical Units (default 5).
+
+	usb-storage.quirks=
+			[UMS] A list of quirks entries to supplement or
+			override the built-in unusual_devs list.  List
+			entries are separated by commas.  Each entry has
+			the form VID:PID:Flags where VID and PID are Vendor
+			and Product ID values (4-digit hex numbers) and
+			Flags is a set of characters, each corresponding
+			to a common usb-storage quirk flag as follows:
+				c = FIX_CAPACITY (decrease the reported
+					device capacity by one sector);
+				i = IGNORE_DEVICE (don't bind to this
+					device);
+				l = NOT_LOCKABLE (don't try to lock and
+					unlock ejectable media);
+				m = MAX_SECTORS_64 (don't transfer more
+					than 64 sectors = 32 KB at a time);
+				r = IGNORE_RESIDUE (the device reports
+					bogus residue values);
+				s = SINGLE_LUN (the device has only one
+					Logical Unit);
+				w = NO_WP_DETECT (don't test whether the
+					medium is write-protected).
+			Example: quirks=0419:aaf5:rl,0421:0433:rc
+
 	add_efi_memmap	[EFI; x86-32,X86-64] Include EFI memory map in
 			kernel's map of available physical RAM.