mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-28 14:44:10 +08:00
c0dccad87c
The currently lockless access to the xen console list in
vtermno_to_xencons() is incorrect, as additions and removals from the
list can happen anytime, and as such the traversal of the list to get
the private console data for a given termno needs to happen with the
lock held. Note users that modify the list already do so with the
lock taken.
Adjust current lock takers to use the _irq{save,restore} helpers,
since the context in which vtermno_to_xencons() is called can have
interrupts disabled. Use the _irq{save,restore} set of helpers to
switch the current callers to disable interrupts in the locked region.
I haven't checked if existing users could instead use the _irq
variant, as I think it's safer to use _irq{save,restore} upfront.
While there switch from using list_for_each_entry_safe to
list_for_each_entry: the current entry cursor won't be removed as
part of the code in the loop body, so using the _safe variant is
pointless.
Fixes:
|
||
|---|---|---|
| .. | ||
| hvc_console.c | ||
| hvc_console.h | ||
| hvc_dcc.c | ||
| hvc_irq.c | ||
| hvc_iucv.c | ||
| hvc_opal.c | ||
| hvc_riscv_sbi.c | ||
| hvc_rtas.c | ||
| hvc_udbg.c | ||
| hvc_vio.c | ||
| hvc_xen.c | ||
| hvcs.c | ||
| hvsi_lib.c | ||
| hvsi.c | ||
| Kconfig | ||
| Makefile | ||