allow discovery without a debugfs 'name' entry

In certain configurations the debugfs file 'name'
might not be populated with a device entry if
no frame buffer is attached.  For instance in headless
or A+I setups.

In these configurations you can use the syntax

umr -i ${instance} -f ${asicname} ...

To issue debugfs commands (registers/waves/etc) to a device
without 'name' contents.

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>

1 files changed, 15 insertions, 16 deletions

diff --git a/src/lib/lowlevel/linux/discover.c b/src/lib/lowlevel/linux/discover.c
index 4d3f2c1..8b7b252 100644
--- a/src/lib/lowlevel/linux/discover.c
+++ b/src/lib/lowlevel/linux/discover.c
@@ -200,22 +200,21 @@ struct umr_asic *umr_discover_asic(struct umr_options *options)
 
 		r = fscanf(f, "%*s %s", name);
 		fclose(f);
-		if (r != 1)
-			return NULL;
-
-		// strip off dev= for kernels > 4.7
-		if (strstr(name, "dev="))
-			memmove(name, name+4, strlen(name)-3);
-
-		if (!strlen(options->pci.name)) {
-			// read the PCI info
-			strcpy(options->pci.name, name);
-			sscanf(name, "%04x:%02x:%02x.%x",
-				&options->pci.domain,
-				&options->pci.bus,
-				&options->pci.slot,
-				&options->pci.func);
-			need_config_scan = 1;
+		if (r == 1) {
+			// strip off dev= for kernels > 4.7
+			if (strstr(name, "dev="))
+				memmove(name, name+4, strlen(name)-3);
+
+			if (!strlen(options->pci.name)) {
+				// read the PCI info
+				strcpy(options->pci.name, name);
+				sscanf(name, "%04x:%02x:%02x.%x",
+					&options->pci.domain,
+					&options->pci.bus,
+					&options->pci.slot,
+					&options->pci.func);
+				need_config_scan = 1;
+			}
 		}
 	}