[ARM] pxa: don't rely on r2 being preserved over a function call

r2 is not guaranteed to be preserved over a function call, so relying
on it to store the link register over the call to sleep_phys_sp() is
unreliable.  Store the link register on the stack instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 2 insertions, 4 deletions

diff --git a/arch/arm/mach-pxa/sleep.S b/arch/arm/mach-pxa/sleep.S
index aff71fec618a..d0447723b73a 100644
--- a/arch/arm/mach-pxa/sleep.S
+++ b/arch/arm/mach-pxa/sleep.S
@@ -43,11 +43,11 @@ pxa_cpu_save_cp:
 pxa_cpu_save_sp:
         @ preserve phys address of stack
         mov     r0, sp
-        mov     r2, lr
+        str     lr, [sp, #-4]!
         bl      sleep_phys_sp
         ldr     r1, =sleep_save_sp
         str     r0, [r1]
-        mov     pc, r2
+        ldr     pc, [sp], #4
 
 /*
  * pxa27x_cpu_suspend()
@@ -270,5 +270,3 @@ resume_after_mmu:
         mar     acc0, r2, r3
 #endif
         ldmfd   sp!, {r4 - r12, pc}             @ return to caller
-
-