From: Matthew Wilcox willy@linux.intel.com
[ Upstream commit 99c494077e2d4282a17120a772eecc00ec3004cc ]
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@linuxonh... 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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/gadget/function/f_hid.c | 6 +++--- drivers/usb/gadget/function/f_printer.c | 6 +++--- include/linux/idr.h | 5 +++++ 3 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c index 8e83649f77ce..42e5677d932d 100644 --- a/drivers/usb/gadget/function/f_hid.c +++ b/drivers/usb/gadget/function/f_hid.c @@ -932,7 +932,7 @@ 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); @@ -958,7 +958,7 @@ 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); @@ -971,7 +971,7 @@ 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; } diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c index b962f24b500b..b3d036d06553 100644 --- a/drivers/usb/gadget/function/f_printer.c +++ b/drivers/usb/gadget/function/f_printer.c @@ -1276,7 +1276,7 @@ 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); @@ -1300,7 +1300,7 @@ 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); @@ -1313,7 +1313,7 @@ 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; } diff --git a/include/linux/idr.h b/include/linux/idr.h index 083d61e92706..3639a28188c9 100644 --- a/include/linux/idr.h +++ b/include/linux/idr.h @@ -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__ */