linux-riscv.lists.infradead.org archive mirror
 help / color / mirror / Atom feed
* [PATCH AUTOSEL 5.11 43/51] pcnet32: Use pci_resource_len to validate PCI resource
       [not found] <20210412162256.313524-1-sashal@kernel.org>
@ 2021-04-12 16:22 ` Sasha Levin
  0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-04-12 16:22 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Guenter Roeck, David S . Miller, Sasha Levin, netdev, linux-riscv

From: Guenter Roeck <linux@roeck-us.net>

[ Upstream commit 66c3f05ddc538ee796321210c906b6ae6fc0792a ]

pci_resource_start() is not a good indicator to determine if a PCI
resource exists or not, since the resource may start at address 0.
This is seen when trying to instantiate the driver in qemu for riscv32
or riscv64.

pci 0000:00:01.0: reg 0x10: [io  0x0000-0x001f]
pci 0000:00:01.0: reg 0x14: [mem 0x00000000-0x0000001f]
...
pcnet32: card has no PCI IO resources, aborting

Use pci_resouce_len() instead.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/amd/pcnet32.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/amd/pcnet32.c b/drivers/net/ethernet/amd/pcnet32.c
index 187b0b9a6e1d..f78daba60b35 100644
--- a/drivers/net/ethernet/amd/pcnet32.c
+++ b/drivers/net/ethernet/amd/pcnet32.c
@@ -1534,8 +1534,7 @@ pcnet32_probe_pci(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 	pci_set_master(pdev);
 
-	ioaddr = pci_resource_start(pdev, 0);
-	if (!ioaddr) {
+	if (!pci_resource_len(pdev, 0)) {
 		if (pcnet32_debug & NETIF_MSG_PROBE)
 			pr_err("card has no PCI IO resources, aborting\n");
 		err = -ENODEV;
@@ -1548,6 +1547,8 @@ pcnet32_probe_pci(struct pci_dev *pdev, const struct pci_device_id *ent)
 			pr_err("architecture does not support 32bit PCI busmaster DMA\n");
 		goto err_disable_dev;
 	}
+
+	ioaddr = pci_resource_start(pdev, 0);
 	if (!request_region(ioaddr, PCNET32_TOTAL_SIZE, "pcnet32_probe_pci")) {
 		if (pcnet32_debug & NETIF_MSG_PROBE)
 			pr_err("io address range already allocated\n");
-- 
2.30.2


_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

^ permalink raw reply related	[flat|nested] only message in thread

only message in thread, other threads:[~2021-04-12 16:24 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
     [not found] <20210412162256.313524-1-sashal@kernel.org>
2021-04-12 16:22 ` [PATCH AUTOSEL 5.11 43/51] pcnet32: Use pci_resource_len to validate PCI resource Sasha Levin

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).