diff options
Diffstat (limited to 'target/linux/generic/backport-5.10/792-v5.15-0002-net-dsa-b53-Set-correct-number-of-ports-in-the-DSA-s.patch')
-rw-r--r-- | target/linux/generic/backport-5.10/792-v5.15-0002-net-dsa-b53-Set-correct-number-of-ports-in-the-DSA-s.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/792-v5.15-0002-net-dsa-b53-Set-correct-number-of-ports-in-the-DSA-s.patch b/target/linux/generic/backport-5.10/792-v5.15-0002-net-dsa-b53-Set-correct-number-of-ports-in-the-DSA-s.patch new file mode 100644 index 0000000000..361b2984fc --- /dev/null +++ b/target/linux/generic/backport-5.10/792-v5.15-0002-net-dsa-b53-Set-correct-number-of-ports-in-the-DSA-s.patch @@ -0,0 +1,43 @@ +From d12e1c4649883e8ca5e8ff341e1948b3b6313259 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Thu, 2 Sep 2021 10:30:51 +0200 +Subject: [PATCH] net: dsa: b53: Set correct number of ports in the DSA struct +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Setting DSA_MAX_PORTS caused DSA to call b53 callbacks (e.g. +b53_disable_port() during dsa_register_switch()) for invalid +(non-existent) ports. That made b53 modify unrelated registers and is +one of reasons for a broken BCM5301x support. + +This problem exists for years but DSA_MAX_PORTS usage has changed few +times. It seems the most accurate to reference commit dropping +dsa_switch_alloc() in the Fixes tag. + +Fixes: 7e99e3470172 ("net: dsa: remove dsa_switch_alloc helper") +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + drivers/net/dsa/b53/b53_common.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +--- a/drivers/net/dsa/b53/b53_common.c ++++ b/drivers/net/dsa/b53/b53_common.c +@@ -2587,6 +2587,8 @@ static int b53_switch_init(struct b53_de + dev->enabled_ports |= BIT(dev->cpu_port); + dev->num_ports = fls(dev->enabled_ports); + ++ dev->ds->num_ports = min_t(unsigned int, dev->num_ports, DSA_MAX_PORTS); ++ + /* Include non standard CPU port built-in PHYs to be probed */ + if (is539x(dev) || is531x5(dev)) { + for (i = 0; i < dev->num_ports; i++) { +@@ -2631,7 +2633,6 @@ struct b53_device *b53_switch_alloc(stru + return NULL; + + ds->dev = base; +- ds->num_ports = DSA_MAX_PORTS; + + dev = devm_kzalloc(base, sizeof(*dev), GFP_KERNEL); + if (!dev) |