ahci: zero-initialize port struct

Specifically port->drive.lchs needs clearing, otherwise seabios will
try interpret whatever random crap happens to be there as disk geometry,
which may or may not break boot depending on how lucky you are.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/hw/ahci.c b/src/hw/ahci.c
index 97a072a1..d45b4307 100644
--- a/src/hw/ahci.c
+++ b/src/hw/ahci.c
@@ -345,6 +345,7 @@ ahci_port_alloc(struct ahci_ctrl_s *ctrl, u32 pnr)
         warn_noalloc();
         return NULL;
     }
+    memset(port, 0, sizeof(*port));
     port->pnr = pnr;
     port->ctrl = ctrl;
     port->list = memalign_tmp(1024, 1024);