Roger Pau Monne 7bed0d49ca hvc/xen: lock console list traversal ... [ Upstream commit 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: 02e19f9c7c ('hvc_xen: implement multiconsole support') Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/20221130163611.14686-1-roger.pau@citrix.com Signed-off-by: Juergen Gross <jgross@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-01-18 11:58:26 +01:00
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Kconfig	tty: hvc: dcc: Bind driver to CPU core0 for reads and writes	2022-05-05 22:45:57 +02:00
Makefile	…
hvc_console.c	Revert "tty: hvc: pass DMA capable memory to put_chars()"	2021-10-26 08:48:09 +02:00
hvc_console.h	Revert "tty: hvc: pass DMA capable memory to put_chars()"	2021-10-26 08:48:09 +02:00
hvc_dcc.c	tty: hvc: dcc: Bind driver to CPU core0 for reads and writes	2022-05-05 22:45:57 +02:00
hvc_irq.c	…
hvc_iucv.c	tty: hvc: remove HVC_IUCV_MAGIC	2022-09-22 16:12:34 +02:00
hvc_opal.c	tty/hvc_opal: simplify if-if to if-else	2022-04-26 13:24:17 +02:00
hvc_riscv_sbi.c	…
hvc_rtas.c	…
hvc_udbg.c	tty: hvc: make symbol 'hvc_udbg_dev' static	2021-04-10 10:41:40 +02:00
hvc_vio.c	tty: hvc: Prepare cleanup of powerpc's asm/prom.h	2022-04-15 08:42:26 +02:00
hvc_xen.c	hvc/xen: lock console list traversal	2023-01-18 11:58:26 +01:00
hvcs.c	termios: start unifying non-UAPI parts of asm/termios.h	2022-09-09 10:44:34 +02:00
hvsi.c	tty: hvc: Prepare cleanup of powerpc's asm/prom.h	2022-04-15 08:42:26 +02:00
hvsi_lib.c	…