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[net,1/2] net: qca_spi: fix receive buffer size check

Message ID 1574270953-4119-2-git-send-email-wahrenst@gmx.net
State Accepted
Delegated to: David Miller
Headers show
Series net: qca_spi: Fix receive and reset issues | expand

Commit Message

Stefan Wahren Nov. 20, 2019, 5:29 p.m. UTC 
From: Michael Heimpold <michael.heimpold@in-tech.com>

When receiving many or larger packets, e.g. when doing a file download,
it was observed that the read buffer size register reports up to 4 bytes
more than the current define allows in the check.
If this is the case, then no data transfer is initiated to receive the
packets (and thus to empty the buffer) which results in a stall of the
interface.

These 4 bytes are a hardware generated frame length which is prepended
to the actual frame, thus we have to respect it during our check.

Fixes: 026b907d58c4 ("net: qca_spi: Add available buffer space verification")
Signed-off-by: Michael Heimpold <michael.heimpold@in-tech.com>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
---
 drivers/net/ethernet/qualcomm/qca_spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--
2.7.4
diff mbox series

Patch

diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 5ecf61d..351f24f 100644
--- a/drivers/net/ethernet/qualcomm/qca_spi.c
+++ b/drivers/net/ethernet/qualcomm/qca_spi.c
@@ -363,7 +363,7 @@  qcaspi_receive(struct qcaspi *qca)
 	netdev_dbg(net_dev, "qcaspi_receive: SPI_REG_RDBUF_BYTE_AVA: Value: %08x\n",
 		   available);

-	if (available > QCASPI_HW_BUF_LEN) {
+	if (available > QCASPI_HW_BUF_LEN + QCASPI_HW_PKT_LEN) {
 		/* This could only happen by interferences on the SPI line.
 		 * So retry later ...
 		 */