Pali Rohár ea531d52fa serial: core: Fix initializing and restoring termios speed ... commit 027b57170bf8bb6999a28e4a5f3d78bf1db0f90c upstream. Since commit edc6afc549 ("tty: switch to ktermios and new framework") termios speed is no longer stored only in c_cflag member but also in new additional c_ispeed and c_ospeed members. If BOTHER flag is set in c_cflag then termios speed is stored only in these new members. Therefore to correctly restore termios speed it is required to store also ispeed and ospeed members, not only cflag member. In case only cflag member with BOTHER flag is restored then functions tty_termios_baud_rate() and tty_termios_input_baud_rate() returns baudrate stored in c_ospeed / c_ispeed member, which is zero as it was not restored too. If reported baudrate is invalid (e.g. zero) then serial core functions report fallback baudrate value 9600. So it means that in this case original baudrate is lost and kernel changes it to value 9600. Simple reproducer of this issue is to boot kernel with following command line argument: "console=ttyXXX,86400" (where ttyXXX is the device name). For speed 86400 there is no Bnnn constant and therefore kernel has to represent this speed via BOTHER c_cflag. Which means that speed is stored only in c_ospeed and c_ispeed members, not in c_cflag anymore. If bootloader correctly configures serial device to speed 86400 then kernel prints boot log to early console at speed speed 86400 without any issue. But after kernel starts initializing real console device ttyXXX then speed is changed to fallback value 9600 because information about speed was lost. This patch fixes above issue by storing and restoring also ispeed and ospeed members, which are required for BOTHER flag. Fixes: edc6afc549 ("[PATCH] tty: switch to ktermios and new framework") Cc: stable@vger.kernel.org Signed-off-by: Pali Rohár <pali@kernel.org> Link: https://lore.kernel.org/r/20211002130900.9518-1-pali@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2021-11-18 19:16:03 +01:00
..
acpi	ACPI: tools: fix compilation error	2021-10-07 19:18:19 +02:00
asm-generic	asm-generic: build fixes for v5.15	2021-10-08 11:57:54 -07:00
clocksource	…
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2021-08-30 12:57:10 -07:00
drm	drm/ttm: Include pagemap.h from ttm_tt.h	2021-08-16 14:44:05 +02:00
dt-bindings	linux-watchdog 5.15-rc1 tag	2021-09-07 13:52:46 -07:00
keys	…
kunit	kunit: fix kernel-doc warnings due to mismatched arg names	2021-10-06 17:54:07 -06:00
kvm	KVM: arm64: Fix PMU probe ordering	2021-09-20 12:43:34 +01:00
linux	serial: core: Fix initializing and restoring termios speed	2021-11-18 19:16:03 +01:00
math-emu	…
media	…
memory	memory: renesas-rpc-if: Correct QSPI data transfer in Manual mode	2021-11-18 19:16:01 +01:00
misc	…
net	mptcp: fix corrupt receiver key in MPC + data + checksum	2021-10-28 08:19:06 -07:00
pcmcia	…
ras	…
rdma	Merge branch 'sg_nents' into rdma.git for-next	2021-08-30 09:49:59 -03:00
scsi	scsi: core: Avoid leaving shost->last_reset with stale value if EH does not run	2021-11-18 19:15:51 +01:00
soc	net: dsa: tag_ocelot_8021q: break circular dependency with ocelot switch lib	2021-10-12 17:35:18 -07:00
sound	ALSA: hda: intel: Allow repeatedly probing on codec configuration errors	2021-10-07 09:15:22 +02:00
target	scsi: target: Allows backend drivers to fail with specific sense codes	2021-08-17 22:28:40 -04:00
trace	block-5.15-2021-10-17	2021-10-17 19:25:20 -10:00
uapi	signal: Add SA_IMMUTABLE to ensure forced siganls do not get changed	2021-11-18 19:16:01 +01:00
vdso	…
video	…
xen	xen/privcmd: drop "pages" parameter from xen_remap_pfn()	2021-10-05 08:20:27 +02:00