From 5c81397a0147ea59c778d1de14ef54e2268221f6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com> Date: Wed, 8 Apr 2015 06:58:11 +0200 Subject: [PATCH] ssb: reject PCI writes setting CardBus bridge resources MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If SoC has a CardBus we can set resources of device at slot 1 only. It's impossigle to set bridge resources as it simply overwrites device 1 configuration and usually results in Data bus error-s. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> --- drivers/ssb/driver_pcicore.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/ssb/driver_pcicore.c +++ b/drivers/ssb/driver_pcicore.c @@ -164,6 +164,10 @@ static int ssb_extpci_write_config(struc SSB_WARN_ON(!pc->hostmode); if (unlikely(len != 1 && len != 2 && len != 4)) goto out; + /* CardBus SoCs allow configuring dev 1 resources only */ + if (extpci_core->cardbusmode && dev != 1 && + off >= PCI_BASE_ADDRESS_0 && off <= PCI_BASE_ADDRESS_5) + goto out; addr = get_cfgspace_addr(pc, bus, dev, func, off); if (unlikely(!addr)) goto out;