Description: serial: mxs-auart: add spinlock around changing cts state
References:
Notes:
 carnil> Introduced in 4d90bb147ef6 ("serial: core: Document and assert lock
 carnil> requirements for irq helpers"). Vulnerable versions: 3.18-rc1.
Bugs:
upstream: released (6.9-rc5) [54c4ec5f8c471b7c1137a1f769648549c423c026]
6.8-upstream-stable: released (6.8.8) [94b0e65c75f4af888ab2dd6c90f060f762924e86]
6.6-upstream-stable: released (6.6.29) [5f40fd6ca2cf0bfbc5a5c9e403dfce8ca899ba37]
6.1-upstream-stable: released (6.1.88) [2c9b943e9924cf1269e44289bc5e60e51b0f5270]
5.10-upstream-stable: released (5.10.216) [0dc0637e6b16158af85945425821bfd0151adb37]
4.19-upstream-stable: released (4.19.313) [56434e295bd446142025913bfdf1587f5e1970ad]
sid: released (6.8.9-1)
6.1-bookworm-security: released (6.1.90-1)
5.10-bullseye-security: released (5.10.216-1)
4.19-buster-security: needed