[PATCH] staging: emxx_udc: use list_first_entry_or_null()

[Geliang Tang]

Simplify the code with list_first_entry_or_null().

Signed-off-by: Geliang Tang <geliangt...@163.com>
---
 drivers/staging/emxx_udc/emxx_udc.c | 30 +++++-------------------------
 1 file changed, 5 insertions(+), 25 deletions(-)

diff --git a/drivers/staging/emxx_udc/emxx_udc.c 
b/drivers/staging/emxx_udc/emxx_udc.c
index 4e6c16a..794bb9b 100644
--- 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;
-- 
2.5.0


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