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Subject[PATCH v2 25/26] usb: gadget: dummy_hcd: remove usage of list iterator past the loop body
Date
To move the list iterator variable into the list_for_each_entry_*()
macro in the future it should be avoided to use the list iterator
variable after the loop body.

To *never* use the list iterator variable after the loop it was
concluded to use a separate iterator variable [1].

Link: https://lore.kernel.org/all/YhdfEIwI4EdtHdym@kroah.com/
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
---
drivers/usb/gadget/udc/dummy_hcd.c | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index a2d956af42a2..35aec8e7fc73 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -751,7 +751,7 @@ static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
struct dummy *dum;
int retval = -EINVAL;
unsigned long flags;
- struct dummy_request *req = NULL;
+ struct dummy_request *req = NULL, *iter;

if (!_ep || !_req)
return retval;
@@ -763,13 +763,14 @@ static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)

local_irq_save(flags);
spin_lock(&dum->lock);
- list_for_each_entry(req, &ep->queue, queue) {
- if (&req->req == _req) {
- list_del_init(&req->queue);
- _req->status = -ECONNRESET;
- retval = 0;
- break;
- }
+ list_for_each_entry(iter, &ep->queue, queue) {
+ if (&iter->req != _req)
+ continue;
+ list_del_init(&iter->queue);
+ _req->status = -ECONNRESET;
+ req = iter;
+ retval = 0;
+ break;
}
spin_unlock(&dum->lock);

--
2.25.1
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