[SCSI] Update wording of CONFIG_SCSI_MULTI_LUN help

I had to set CONFIG_SCSI_MULTI_LUN to y in order to get my SE W595
working when plugging it as a mass storage. Looking at SCSI option to
get a phone behaving correctly was convoluted to say the least. There
are quite a few other reports about USB card readers needing this option
as well. This patch improves the help text to make the use of the option
more obvious.

Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 6e8106a..759e150 100644 (file)
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -191,20 +191,19 @@ config SCSI_ENCLOSURE
          it has an enclosure device.  Selecting this option will just allow
          certain enclosure conditions to be reported and is not required.
 
-comment "Some SCSI devices (e.g. CD jukebox) support multiple LUNs"
-       depends on SCSI
-
 config SCSI_MULTI_LUN
        bool "Probe all LUNs on each SCSI device"
        depends on SCSI
        help
-         If you have a SCSI device that supports more than one LUN (Logical
-         Unit Number), e.g. a CD jukebox, and only one LUN is detected, you
-         can say Y here to force the SCSI driver to probe for multiple LUNs.
-         A SCSI device with multiple LUNs acts logically like multiple SCSI
-         devices. The vast majority of SCSI devices have only one LUN, and
-         so most people can say N here. The max_luns boot/module parameter 
-         allows to override this setting.
+         Some devices support more than one LUN (Logical Unit Number) in order
+         to allow access to several media, e.g. CD jukebox, USB card reader,
+         mobile phone in mass storage mode. This option forces the kernel to
+         probe for all LUNs by default. This setting can be overriden by
+         max_luns boot/module parameter. Note that this option does not affect
+         devices conforming to SCSI-3 or higher as they can explicitely report
+         their number of LUNs. It is safe to say Y here unless you have one of
+         those rare devices which reacts in an unexpected way when probed for
+         multiple LUNs.
 
 config SCSI_CONSTANTS
        bool "Verbose SCSI error reporting (kernel size +=12K)"