There are MBIM devices out there reporting
dwNtbInMaxSize=2048 dwNtbOutMaxSize=2048
and since the spec require a datagram max size of at least
2048, this means that a full sized datagram will never fit.
Still, sending larger NTBs than the device supports is not
going to help. We do not have any other options than either
a) refusing to bindi, or
b) respect the insanely low value.
Alternative b will at least make these devices work, so go
for it.
Cc: Alexey Orishko <alexey.oris...@gmail.com>
Signed-off-by: Bjørn Mork <bj...@mork.no>
---
drivers/net/usb/cdc_ncm.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 4531f38..11c7033 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -159,8 +159,7 @@ static u8 cdc_ncm_setup(struct usbnet *dev)
}
/* verify maximum size of transmitted NTB in bytes */
- if ((ctx->tx_max < (CDC_NCM_MIN_HDR_SIZE + ctx->max_datagram_size)) ||
- (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) {
+ if (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX) {
dev_dbg(&dev->intf->dev, "Using default maximum transmit
length=%d\n",
CDC_NCM_NTB_MAX_SIZE_TX);
ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX;
--
1.7.10.4
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