From: David Woodhouse dwmw@amazon.co.uk
stable inclusion from stable-v6.6.3 commit 202f4d78d16b5fa920f0d28c22ed2c07f189879a category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8LBQP
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 2704c9a5593f4a47620c12dad78838ca62b52f48 upstream.
The xen_hvc_init() function should always register the frontend driver, even when there's no primary console — as there may be secondary consoles. (Qemu can always add secondary consoles, but only the toolstack can add the primary because it's special.)
Signed-off-by: David Woodhouse dwmw@amazon.co.uk Reviewed-by: Juergen Gross jgross@suse.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231020161529.355083-3-dwmw2@infradead.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/tty/hvc/hvc_xen.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c index c3cee11ed7d9..81627442027a 100644 --- a/drivers/tty/hvc/hvc_xen.c +++ b/drivers/tty/hvc/hvc_xen.c @@ -604,7 +604,7 @@ static int __init xen_hvc_init(void) ops = &dom0_hvc_ops; r = xen_initial_domain_console_init(); if (r < 0) - return r; + goto register_fe; info = vtermno_to_xencons(HVC_COOKIE); } else { ops = &domU_hvc_ops; @@ -613,7 +613,7 @@ static int __init xen_hvc_init(void) else r = xen_pv_console_init(); if (r < 0) - return r; + goto register_fe;
info = vtermno_to_xencons(HVC_COOKIE); info->irq = bind_evtchn_to_irq_lateeoi(info->evtchn); @@ -638,6 +638,7 @@ static int __init xen_hvc_init(void) }
r = 0; + register_fe: #ifdef CONFIG_HVC_XEN_FRONTEND r = xenbus_register_frontend(&xencons_driver); #endif