[PATCH] pcnet32: Prevent hang with 79c976
Some boards using the 79c976 pcnet32 chip will hang the system if the
ethtool --register-dump is performed with the device operational. The
request to read bcr30 is retried by the PCI device infinitely without
returning data, hanging the system.
Tested ia32 and ppc64.
Signed-off-by: Don Fry <brazilnut@us.ibm.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
diff --git a/drivers/net/pcnet32.c b/drivers/net/pcnet32.c
index 549a073..be31922 100644
--- a/drivers/net/pcnet32.c
+++ b/drivers/net/pcnet32.c
@@ -988,7 +988,11 @@
*buff++ = a->read_csr(ioaddr, 114);
/* read bus configuration registers */
- for (i=0; i<36; i++) {
+ for (i=0; i<30; i++) {
+ *buff++ = a->read_bcr(ioaddr, i);
+ }
+ *buff++ = 0; /* skip bcr30 so as not to hang 79C976 */
+ for (i=31; i<36; i++) {
*buff++ = a->read_bcr(ioaddr, i);
}