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usb: gadget: f_printer: actually limit the number of instances

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There is a predefined maximum number of printer instances, currently 4.
A chrdev region is allocated accordingly, but with configfs the user
can create as many printer function directories as they like. To make the
number of printer  instances consistent with the number of allocated
minors, the limit is enforced at directory creation time.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Andrzej Pietrasiewicz 2015-07-24 09:48:41 +02:00 committed by Felipe Balbi
parent 774cf72f8a
commit 4248bd7d3e
1 changed files with 9 additions and 1 deletions
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10
drivers/usb/gadget/function/f_printer.c
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@ -1248,7 +1248,15 @@ static struct config_item_type printer_func_type = {
static inline int gprinter_get_minor(void)
{
return ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL);
int ret;
ret = ida_simple_get(&printer_ida, 0, 0, GFP_KERNEL);
if (ret >= PRINTER_MINORS) {
ida_simple_remove(&printer_ida, ret);
ret = -ENODEV;
}
return ret;
}
static inline void gprinter_put_minor(int minor)