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usb: gadget: aspeed_udc: cleanup loop in ast_dma_descriptor_setup() 

The "chunk >= 0" condition does not work because count is a u32.
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: 055276c132 ("usb: gadget: add Aspeed ast2600 udc driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/Yq2SvM2bbrtSd1H9@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2022-06-18 11:54:20 +03:00 committed by Greg Kroah-Hartman
parent 3d393f0303
commit c09b1f372e
1 changed files with 11 additions and 13 deletions
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24
drivers/usb/gadget/udc/aspeed_udc.c
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@ -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;
EP_DBG(ep, "descs[%d]: 0x%x 0x%x, last:%d\n",
chunk -= ep->chunk_max;
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;