| Message ID | YrRj38cU1nV4gsUX@kili (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2] usb: gadget: aspeed_udc: fix handling of tx_len == 0 | expand |
> The bug is that we should still enter this loop if "tx_len" is zero. > > Reported-by: Neal Liu <neal_liu@aspeedtech.com> > Fixes: c09b1f372e74 ("usb: gadget: aspeed_udc: cleanup loop in > ast_dma_descriptor_setup()") > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> > --- > v2: Remove the unnecessary "chunk >= 0" condition I mean v1 looks good to me. Sorry if you are misunderstanding. > > drivers/usb/gadget/udc/aspeed_udc.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/drivers/usb/gadget/udc/aspeed_udc.c > b/drivers/usb/gadget/udc/aspeed_udc.c > index d75a4e070bf7..6ff02acc5662 100644 > --- a/drivers/usb/gadget/udc/aspeed_udc.c > +++ b/drivers/usb/gadget/udc/aspeed_udc.c > @@ -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 (!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; > > -- > 2.35.1
On Fri, Jun 24, 2022 at 02:01:18AM +0000, Neal Liu wrote: > > The bug is that we should still enter this loop if "tx_len" is zero. > > > > Reported-by: Neal Liu <neal_liu@aspeedtech.com> > > Fixes: c09b1f372e74 ("usb: gadget: aspeed_udc: cleanup loop in > > ast_dma_descriptor_setup()") > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> > > --- > > v2: Remove the unnecessary "chunk >= 0" condition > > I mean v1 looks good to me. > Sorry if you are misunderstanding. I have no idea if v1 or v2 is the "correct" one here, sorry. Dan, can you send a v3 that you all agree on? thanks, greg k-h
diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c index d75a4e070bf7..6ff02acc5662 100644 --- a/drivers/usb/gadget/udc/aspeed_udc.c +++ b/drivers/usb/gadget/udc/aspeed_udc.c @@ -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 (!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;
The bug is that we should still enter this loop if "tx_len" is zero. Reported-by: Neal Liu <neal_liu@aspeedtech.com> Fixes: c09b1f372e74 ("usb: gadget: aspeed_udc: cleanup loop in ast_dma_descriptor_setup()") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> --- v2: Remove the unnecessary "chunk >= 0" condition drivers/usb/gadget/udc/aspeed_udc.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)