From: Stefano Stabellini stefano.stabellini@xilinx.com
In case of errors in xenbus_init (e.g. missing xen_store_gfn parameter), we goto out_error but we forget to reset xen_store_domain_type to XS_UNKNOWN. As a consequence xenbus_probe_initcall and other initcalls will still try to initialize xenstore resulting into a crash at boot.
[ 2.479830] Call trace: [ 2.482314] xb_init_comms+0x18/0x150 [ 2.486354] xs_init+0x34/0x138 [ 2.489786] xenbus_probe+0x4c/0x70 [ 2.498432] xenbus_probe_initcall+0x2c/0x7c [ 2.503944] do_one_initcall+0x54/0x1b8 [ 2.507358] kernel_init_freeable+0x1ac/0x210 [ 2.511617] kernel_init+0x28/0x130 [ 2.516112] ret_from_fork+0x10/0x20
Cc: Stable@vger.kernel.org Cc: jbeulich@suse.com Signed-off-by: Stefano Stabellini stefano.stabellini@xilinx.com --- Changes in v2: - use return 0 for the success case - remove err initializer as it is not useful any longer --- drivers/xen/xenbus/xenbus_probe.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c index bd003ca8acbe..5967aa937255 100644 --- a/drivers/xen/xenbus/xenbus_probe.c +++ b/drivers/xen/xenbus/xenbus_probe.c @@ -909,7 +909,7 @@ static struct notifier_block xenbus_resume_nb = {
static int __init xenbus_init(void) { - int err = 0; + int err; uint64_t v = 0; xen_store_domain_type = XS_UNKNOWN;
@@ -983,8 +983,10 @@ static int __init xenbus_init(void) */ proc_create_mount_point("xen"); #endif + return 0;
out_error: + xen_store_domain_type = XS_UNKNOWN; return err; }