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idr: add ida_is_empty 

Two of the USB Gadgets were poking around in the internals of struct ida
in order to determine if it is empty.  Add the appropriate abstraction.

Link: http://lkml.kernel.org/r/1480369871-5271-63-git-send-email-mawilcox@linuxonhyperv.com
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Acked-by: Konstantin Khlebnikov <koct9i@gmail.com>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Felipe Balbi <balbi@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2016-12-14 15:09:13 -08:00 committed by Linus Torvalds
parent 3e3cdc68be
commit 99c494077e
3 changed files with 11 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/gadget/function/f_hid.c
View File

@ -905,7 +905,7 @@ static void hidg_free_inst(struct usb_function_instance *f)
mutex_lock(&hidg_ida_lock);
hidg_put_minor(opts->minor);
if (idr_is_empty(&hidg_ida.idr))
if (ida_is_empty(&hidg_ida))
ghid_cleanup();
mutex_unlock(&hidg_ida_lock);
@ -931,7 +931,7 @@ static struct usb_function_instance *hidg_alloc_inst(void)
mutex_lock(&hidg_ida_lock);
if (idr_is_empty(&hidg_ida.idr)) {
if (ida_is_empty(&hidg_ida)) {
status = ghid_setup(NULL, HIDG_MINORS);
if (status) {
ret = ERR_PTR(status);
@ -944,7 +944,7 @@ static struct usb_function_instance *hidg_alloc_inst(void)
if (opts->minor < 0) {
ret = ERR_PTR(opts->minor);
kfree(opts);
if (idr_is_empty(&hidg_ida.idr))
if (ida_is_empty(&hidg_ida))
ghid_cleanup();
goto unlock;
}

6
drivers/usb/gadget/function/f_printer.c
View File

@ -1265,7 +1265,7 @@ static void gprinter_free_inst(struct usb_function_instance *f)
mutex_lock(&printer_ida_lock);
gprinter_put_minor(opts->minor);
if (idr_is_empty(&printer_ida.idr))
if (ida_is_empty(&printer_ida))
gprinter_cleanup();
mutex_unlock(&printer_ida_lock);
@ -1289,7 +1289,7 @@ static struct usb_function_instance *gprinter_alloc_inst(void)
mutex_lock(&printer_ida_lock);
if (idr_is_empty(&printer_ida.idr)) {
if (ida_is_empty(&printer_ida)) {
status = gprinter_setup(PRINTER_MINORS);
if (status) {
ret = ERR_PTR(status);
@ -1302,7 +1302,7 @@ static struct usb_function_instance *gprinter_alloc_inst(void)
if (opts->minor < 0) {
ret = ERR_PTR(opts->minor);
kfree(opts);
if (idr_is_empty(&printer_ida.idr))
if (ida_is_empty(&printer_ida))
gprinter_cleanup();
goto unlock;
}

5
include/linux/idr.h
View File

@ -195,6 +195,11 @@ static inline int ida_get_new(struct ida *ida, int *p_id)
return ida_get_new_above(ida, 0, p_id);
}
static inline bool ida_is_empty(struct ida *ida)
{
return idr_is_empty(&ida->idr);
}
void __init idr_init_cache(void);
#endif /* __IDR_H__ */