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Subject[PATCHv4 1/2] usb: gadget: storage: strict coversion of 'ro' parameter
Date
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>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: linux-usb@vger.kernel.org
---
drivers/usb/gadget/storage_common.c | 8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 04c462f..7123929 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -723,9 +723,9 @@ static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
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;

/* Allow the write-enable status to change only while the backing file
@@ -735,8 +735,8 @@ static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
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);
--
1.6.3.3
--
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