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Also, really we shouldn't enter the loop when "chunk" is zero. Once that condition is fixed then there is no need for the "last" variable. I reversed the "if (chunk <= ep->chunk_max)" as well. The new loop is much simpler. Fixes: 055276c13205 ("usb: gadget: add Aspeed ast2600 udc driver") Signed-off-by: Dan Carpenter --- drivers/usb/gadget/udc/aspeed_udc.c | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-) diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c index 1fc15228ff15..77376ae04224 100644 --- a/drivers/usb/gadget/udc/aspeed_udc.c +++ b/drivers/usb/gadget/udc/aspeed_udc.c @@ -476,8 +476,8 @@ static int ast_dma_descriptor_setup(struct ast_udc_ep *ep, u32 dma_buf, { struct ast_udc_dev *udc = ep->udc; struct device *dev = &udc->pdev->dev; - u32 offset, chunk; - int count, last; + int chunk, count; + u32 offset; if (!ep->descs) { dev_warn(dev, "%s: Empty DMA descs list failure\n", @@ -486,30 +486,28 @@ static int ast_dma_descriptor_setup(struct ast_udc_ep *ep, u32 dma_buf, } chunk = tx_len; - offset = count = last = 0; + offset = count = 0; EP_DBG(ep, "req @%p, %s:%d, %s:0x%x, %s:0x%x\n", req, "wptr", ep->descs_wptr, "dma_buf", dma_buf, "tx_len", tx_len); /* Create Descriptor Lists */ - while (chunk >= 0 && !last && count < AST_UDC_DESCS_COUNT) { + while (chunk > 0 && count < AST_UDC_DESCS_COUNT) { ep->descs[ep->descs_wptr].des_0 = dma_buf + offset; - if (chunk <= ep->chunk_max) { - ep->descs[ep->descs_wptr].des_1 = chunk; - last = 1; - } else { + if (chunk > ep->chunk_max) ep->descs[ep->descs_wptr].des_1 = ep->chunk_max; - chunk -= ep->chunk_max; - } + else + ep->descs[ep->descs_wptr].des_1 = chunk; + + chunk -= ep->chunk_max; - EP_DBG(ep, "descs[%d]: 0x%x 0x%x, last:%d\n", + EP_DBG(ep, "descs[%d]: 0x%x 0x%x\n", ep->descs_wptr, ep->descs[ep->descs_wptr].des_0, - ep->descs[ep->descs_wptr].des_1, - last); + ep->descs[ep->descs_wptr].des_1); if (count == 0) req->saved_dma_wptr = ep->descs_wptr; From patchwork Sat Jun 18 08:54:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Carpenter X-Patchwork-Id: 1644994 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; 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before returning an error code. Fixes: 055276c13205 ("usb: gadget: add Aspeed ast2600 udc driver") Signed-off-by: Dan Carpenter --- drivers/usb/gadget/udc/aspeed_udc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c index 77376ae04224..4dead40895dd 100644 --- a/drivers/usb/gadget/udc/aspeed_udc.c +++ b/drivers/usb/gadget/udc/aspeed_udc.c @@ -663,7 +663,8 @@ static int ast_udc_ep_queue(struct usb_ep *_ep, struct usb_request *_req, if (ep->ep.desc == NULL) { if ((req->req.dma % 4) != 0) { dev_warn(dev, "EP0 req dma alignment error\n"); - return -ESHUTDOWN; + rc = -ESHUTDOWN; + goto end; } ast_udc_ep0_queue(ep, req);