From 22030e7fc0b14dd6a9ea59a7fb3aa7af803d0cd7 Mon Sep 17 00:00:00 2001
From: Michael Heimpold <michael.heimpold@in-tech.com>
Date: Wed, 20 Nov 2019 18:29:12 +0100
Subject: [PATCH 10/11] net: qca_spi: fix receive buffer size check
Patch-mainline: v5.4
Git-commit: 3e7e676c8196efbdedf6e12e895356f073f39abd
References: git-fixes
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>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/ethernet/qualcomm/qca_spi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c
index 5ecf61df78bd..351f24ff4ca5 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 ...
*/
--
2.16.4