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I'll do some testing in the beginning of next week. Which Kvaser device did you use when you discovered the problem? Best regards, jimmy On 10/23/25 18:27, pip-izony wrote: > From: Seungjin Bae > > The `kvaser_usb_leaf_wait_cmd()` and `kvaser_usb_leaf_read_bulk_callback` > functions contain logic to zero-length commands. These commands are used > to align data to the USB endpoint's wMaxPacketSize boundary. > > The driver attempts to skip these placeholders by aligning the buffer > position `pos` to the next packet boundary using `round_up()` function. > > However, if zero-length command is found exactly on a packet boundary > (i.e., `pos` is a multiple of wMaxPacketSize, including 0), `round_up` > function will return the unchanged value of `pos`. This prevents `pos` > to be increased, causing an infinite loop in the parsing logic. > > This patch fixes this in the function by using `pos + 1` instead. > This ensures that even if `pos` is on a boundary, the calculation is > based on `pos + 1`, forcing `round_up()` to always return the next > aligned boundary. > > Fixes: 7259124eac7d ("can: kvaser_usb: Split driver into kvaser_usb_core.c and kvaser_usb_leaf.c") > Signed-off-by: Seungjin Bae > --- > v1 -> v2: Apply the same infinite loop fix to kvaser_usb_leaf_wait_cmd() > > drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c > index c29828a94ad0..1167d38344f1 100644 > --- a/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c > +++ b/drivers/net/can/usb/kvaser_usb/kvaser_usb_leaf.c > @@ -685,7 +685,7 @@ static int kvaser_usb_leaf_wait_cmd(const struct kvaser_usb *dev, u8 id, > * for further details. > */ > if (tmp->len == 0) { > - pos = round_up(pos, > + pos = round_up(pos + 1, > le16_to_cpu > (dev->bulk_in->wMaxPacketSize)); > continue; > @@ -1732,7 +1732,7 @@ static void kvaser_usb_leaf_read_bulk_callback(struct kvaser_usb *dev, > * number of events in case of a heavy rx load on the bus. > */ > if (cmd->len == 0) { > - pos = round_up(pos, le16_to_cpu > + pos = round_up(pos + 1, le16_to_cpu > (dev->bulk_in->wMaxPacketSize)); > continue; > }