usb: gadget: storage: strict coversion of 'ro' parameter
Bring a strict way to get the 'ro' parameter from the user.
The patch followed by this one adds another boolean parameter. To be consistent
Michał Nazarewicz proposed to use simple_strtol() in both cases (correspondend
discussion in LKML [1]). Due to simple_strtol() doesn't return error in a good
way and we have a boolean parameter the strict_strtoul() is used.
[1] http://lkml.org/lkml/2010/7/14/169
Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index a10faec..3bbddab 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -748,9 +748,9 @@
ssize_t rc = count;
struct fsg_lun *curlun = fsg_lun_from_dev(dev);
struct rw_semaphore *filesem = dev_get_drvdata(dev);
- int i;
+ unsigned long ro;
- if (sscanf(buf, "%d", &i) != 1)
+ if (strict_strtoul(buf, 2, &ro))
return -EINVAL;
/*
@@ -762,8 +762,8 @@
LDBG(curlun, "read-only status change prevented\n");
rc = -EBUSY;
} else {
- curlun->ro = !!i;
- curlun->initially_ro = !!i;
+ curlun->ro = ro;
+ curlun->initially_ro = ro;
LDBG(curlun, "read-only status set to %d\n", curlun->ro);
}
up_read(filesem);