media: dvb-frontends: avoid stack overflow warnings with clang

stable inclusion
from stable-v4.19.311
commit c073c8cede5abd3836e83d70d72606d11d0759d4
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9L9J6
CVE: CVE-2024-27075

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=c073c8cede5abd3836e83d70d72606d11d0759d4



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[ Upstream commit 7a4cf27d1f0538f779bf31b8c99eda394e277119 ]

A previous patch worked around a KASAN issue in stv0367, now a similar
problem showed up with clang:

drivers/media/dvb-frontends/stv0367.c:1222:12: error: stack frame size (3624) exceeds limit (2048) in 'stv0367ter_set_frontend' [-Werror,-Wframe-larger-than]
 1214 | static int stv0367ter_set_frontend(struct dvb_frontend *fe)

Rework the stv0367_writereg() function to be simpler and mark both
register access functions as noinline_for_stack so the temporary
i2c_msg structures do not get duplicated on the stack when KASAN_STACK
is enabled.

Fixes: 3cd890db ("media: dvb-frontends: fix i2c access helpers for KASAN")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Justin Stitt <justinstitt@google.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Cai Xinchen <caixinchen1@huawei.com>