diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/i386/drivers/net/undiload.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/arch/i386/drivers/net/undiload.c b/src/arch/i386/drivers/net/undiload.c index 1d4e88d7f..47a2baede 100644 --- a/src/arch/i386/drivers/net/undiload.c +++ b/src/arch/i386/drivers/net/undiload.c @@ -58,6 +58,12 @@ int undi_load ( struct undi_device *undi, struct undi_rom *undirom ) { uint16_t exit; int rc; + /* Only one UNDI instance may be loaded at any given time */ + if ( undi_loader_entry.segment ) { + DBG ( "UNDI %p cannot load multiple instances\n", undi ); + return -EBUSY; + } + /* Set up START_UNDI parameters */ memset ( &undi_loader, 0, sizeof ( undi_loader ) ); undi_loader.AX = undi->pci_busdevfn; @@ -109,6 +115,9 @@ int undi_load ( struct undi_device *undi, struct undi_rom *undirom ) { gateA20_set(); if ( exit != PXENV_EXIT_SUCCESS ) { + /* Clear entry point */ + memset ( &undi_loader_entry, 0, sizeof ( undi_loader_entry ) ); + rc = -undi_loader.Status; if ( rc == 0 ) /* Paranoia */ rc = -EIO; @@ -151,6 +160,9 @@ int undi_unload ( struct undi_device *undi ) { DBGC ( undi, "UNDI %p unloading\n", undi ); + /* Clear entry point */ + memset ( &undi_loader_entry, 0, sizeof ( undi_loader_entry ) ); + /* Erase signatures */ if ( undi->pxenv.segment ) put_real ( dead, undi->pxenv.segment, undi->pxenv.offset ); |