staging: emxx_udc: use list_first_entry_or_null()

Simplify the code with list_first_entry_or_null().

Signed-off-by: Geliang Tang <geliangtang@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
index c168845..beb9411 100644 (file)
--- a/drivers/staging/emxx_udc/emxx_udc.c
+++ b/drivers/staging/emxx_udc/emxx_udc.c
@@ -1285,11 +1285,7 @@ static void _nbu2ss_restert_transfer(struct nbu2ss_ep *ep)
        bool    bflag = FALSE;
        struct nbu2ss_req *req;
 
-       if (list_empty(&ep->queue))
-               req = NULL;
-       else
-               req = list_entry(ep->queue.next, struct nbu2ss_req, queue);
-
+       req = list_first_entry_or_null(&ep->queue, struct nbu2ss_req, queue);
        if (!req)
                return;
 
@@ -1784,11 +1780,7 @@ static inline int _nbu2ss_ep0_in_data_stage(struct nbu2ss_udc *udc)
        struct nbu2ss_req       *req;
        struct nbu2ss_ep        *ep = &udc->ep[0];
 
-       if (list_empty(&ep->queue))
-               req = NULL;
-       else
-               req = list_entry(ep->queue.next, struct nbu2ss_req, queue);
-
+       req = list_first_entry_or_null(&ep->queue, struct nbu2ss_req, queue);
        if (!req)
                req = &udc->ep0_req;
 
@@ -1811,11 +1803,7 @@ static inline int _nbu2ss_ep0_out_data_stage(struct nbu2ss_udc *udc)
        struct nbu2ss_req       *req;
        struct nbu2ss_ep        *ep = &udc->ep[0];
 
-       if (list_empty(&ep->queue))
-               req = NULL;
-       else
-               req = list_entry(ep->queue.next, struct nbu2ss_req, queue);
-
+       req = list_first_entry_or_null(&ep->queue, struct nbu2ss_req, queue);
        if (!req)
                req = &udc->ep0_req;
 
@@ -1838,11 +1826,7 @@ static inline int _nbu2ss_ep0_status_stage(struct nbu2ss_udc *udc)
        struct nbu2ss_req       *req;
        struct nbu2ss_ep        *ep = &udc->ep[0];
 
-       if (list_empty(&ep->queue))
-               req = NULL;
-       else
-               req = list_entry(ep->queue.next, struct nbu2ss_req, queue);
-
+       req = list_first_entry_or_null(&ep->queue, struct nbu2ss_req, queue);
        if (!req) {
                req = &udc->ep0_req;
                if (req->req.complete)
@@ -2145,11 +2129,7 @@ static inline void _nbu2ss_epn_int(struct nbu2ss_udc *udc, u32 epnum)
        /* Interrupt Clear */
        _nbu2ss_writel(&udc->p_regs->EP_REGS[num].EP_STATUS, ~(u32)status);
 
-       if (list_empty(&ep->queue))
-               req = NULL;
-       else
-               req = list_entry(ep->queue.next, struct nbu2ss_req, queue);
-
+       req = list_first_entry_or_null(&ep->queue, struct nbu2ss_req, queue);
        if (!req) {
                /* pr_warn("=== %s(%d) req == NULL\n", __func__, epnum); */
                return;