CVE-2022-49841: serial: imx: Add missing .thaw_noirq hook

In the Linux kernel, the following vulnerability has been resolved:

serial: imx: Add missing .thawnoirq hook

The following warning is seen with non-console UART instance when system hibernates.

[ 37.371969] ------------[ cut here ]------------ [ 37.376599] uart3rootclk already disabled [ 37.380810] WARNING: CPU: 0 PID: 296 at drivers/clk/clk.c:952 clkcoredisable+0xa4/0xb0 ... [ 37.506986] Call trace: [ 37.509432] clkcoredisable+0xa4/0xb0 [ 37.513270] clkdisable+0x34/0x50 [ 37.516672] imxuartthaw+0x38/0x5c [ 37.520250] platformpmthaw+0x30/0x6c [ 37.524089] dpmruncallback.constprop.0+0x3c/0xd4 [ 37.528972] deviceresume+0x7c/0x160 [ 37.532633] dpmresume+0xe8/0x230 [ 37.536036] hibernationsnapshot+0x288/0x430 [ 37.540397] hibernate+0x10c/0x2e0 [ 37.543798] statestore+0xc4/0xd0 [ 37.547203] kobjattrstore+0x1c/0x30 [ 37.550953] sysfskfwrite+0x48/0x60 [ 37.554619] kernfsfopwriteiter+0x118/0x1ac [ 37.559063] newsyncwrite+0xe8/0x184 [ 37.562812] vfswrite+0x230/0x290 [ 37.566214] ksyswrite+0x68/0xf4 [ 37.569529] arm64syswrite+0x20/0x2c [ 37.573452] invokesyscall.constprop.0+0x50/0xf0 [ 37.578156] doel0svc+0x11c/0x150 [ 37.581648] el0svc+0x30/0x140 [ 37.584792] el0t64synchandler+0xe8/0xf0 [ 37.588976] el0t64sync+0x1a0/0x1a4 [ 37.592639] ---[ end trace 56e22eec54676d75 ]---

On hibernating, pm core calls into related hooks in sequence like:

.freeze .freezenoirq .thawnoirq .thaw

With .thawnoirq hook being absent, the clock will be disabled in a unbalanced call which results the warning above.

imxuartfreeze() clkprepareenable() imxuartsuspendnoirq() clkdisable() imxuartthaw clkdisableunprepare()

Adding the missing .thawnoirq hook as imxuartresumenoirq() will have the call sequence corrected as below and thus fix the warning.

imxuartfreeze() clkprepareenable() imxuartsuspendnoirq() clkdisable() imxuartresumenoirq() clkenable() imxuartthaw clkdisableunprepare()