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usb: gadget: aspeed_udc: fix handling of tx_len == 0

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The bug is that we should still enter this loop if "tx_len" is zero.

After adding the "last" variable, then the "chunk >= 0" condition is no
longer required but I left it for readability.

Fixes: c09b1f372e ("usb: gadget: aspeed_udc: cleanup loop in ast_dma_descriptor_setup()")
Reported-by: Neal Liu <neal_liu@aspeedtech.com>
Reviewed-by: Neal Liu <neal_liu@aspeedtech.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/Yrq6F5okoX1y05rT@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2022-06-28 11:21:43 +03:00 committed by Greg Kroah-Hartman
parent babfcd947e
commit 70cdb930f7
1 changed files with 6 additions and 3 deletions
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9
drivers/usb/gadget/udc/aspeed_udc.c
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@ -476,6 +476,7 @@ 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;
bool last = false;
int chunk, count;
u32 offset;
@ -493,14 +494,16 @@ static int ast_dma_descriptor_setup(struct ast_udc_ep *ep, u32 dma_buf,
"tx_len", tx_len);
/* Create Descriptor Lists */
while (chunk > 0 && count < AST_UDC_DESCS_COUNT) {
while (chunk >= 0 && !last && count < AST_UDC_DESCS_COUNT) {
ep->descs[ep->descs_wptr].des_0 = dma_buf + offset;
if (chunk > ep->chunk_max)
if (chunk > ep->chunk_max) {
ep->descs[ep->descs_wptr].des_1 = ep->chunk_max;
else
} else {
ep->descs[ep->descs_wptr].des_1 = chunk;
last = true;
}
chunk -= ep->chunk_max;