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USB: storage: avoid scanning other targets for single target device 

This patch sets scsi_host->max_id as 1 if the device's quirk
flag of US_FL_SCM_MULT_TARG isn't set, because there are only 6
mass storage devices marked as mutiple targets from unusual_devs.h.

This patch is a small optimization about scanning targets, and
avoid scanning other 7 non-existed targets for single target
device.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2013-01-19 19:30:30 +08:00 committed by Greg Kroah-Hartman
parent fde2638031
commit f4cc1834bd
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/storage/usb.c
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@ -976,6 +976,9 @@ int usb_stor_probe2(struct us_data *us)
if (us->fflags & US_FL_SINGLE_LUN)
us->max_lun = 0;
if (!(us->fflags & US_FL_SCM_MULT_TARG))
us_to_host(us)->max_id = 1;
/* Find the endpoints and calculate pipe values */
result = get_pipes(us);
if (result)