From b0c61ad624f8398b91bcdd201cdf13dc02d51372 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>
Date: Sat, 5 Nov 2022 17:51:25 +0100
Subject: libpci: mmio-ports: Check for write access to /dev/mem in detect
 method

---
 lib/mmio-ports.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/mmio-ports.c b/lib/mmio-ports.c
index 50cbee7..ae9c30d 100644
--- a/lib/mmio-ports.c
+++ b/lib/mmio-ports.c
@@ -243,9 +243,9 @@ conf1_detect(struct pci_access *a)
       return 0;
     }
 
-  if (access(devmem, R_OK))
+  if (access(devmem, R_OK | W_OK))
     {
-      a->debug("cannot access %s", devmem);
+      a->debug("cannot access %s: %s", devmem, strerror(errno));
       return 0;
     }
 
-- 
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