pnv_phb4.c: check if root port exists in rc_config functions

pnv_phb4_rc_config_read() and pnv_phb4_rc_config_write() are asserting
the existence of the root port. The root port is now optional, and there
will be cases where a pnv-phb4 device won't have a root port attached.

Instead of asserting, check if the root port exists before read/writing
into it.

Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20220105212338.49899-6-danielhb413@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

1 files changed, 8 insertions, 2 deletions

diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
index 14827f8..83dedc8 100644
--- a/hw/pci-host/pnv_phb4.c
+++ b/hw/pci-host/pnv_phb4.c
@@ -152,7 +152,10 @@ static void pnv_phb4_rc_config_write(PnvPHB4 *phb, unsigned off,
     }
 
     pdev = pci_find_device(pci->bus, 0, 0);
-    assert(pdev);
+    if (!pdev) {
+        phb_error(phb, "rc_config_write device not found\n");
+        return;
+    }
 
     pci_host_config_write_common(pdev, off, PHB_RC_CONFIG_SIZE,
                                  bswap32(val), 4);
@@ -171,7 +174,10 @@ static uint64_t pnv_phb4_rc_config_read(PnvPHB4 *phb, unsigned off,
     }
 
     pdev = pci_find_device(pci->bus, 0, 0);
-    assert(pdev);
+    if (!pdev) {
+        phb_error(phb, "rc_config_read device not found\n");
+        return ~0ull;
+    }
 
     val = pci_host_config_read_common(pdev, off, PHB_RC_CONFIG_SIZE, 4);
     return bswap32(val);