ARM: 7681/1: hw_breakpoint: use warn_once to avoid spam from reset_ctrl_regs()

CPU debug features like hardware break, watchpoints can be used only
when the debug mode is enabled and available. Unfortunately on OMAP4
based devices, after a CPU power cycle, the debug feature gets disabled
which leads to a flood of messages coming from reset_ctrl_regs() which
gets called on every CPU_PM_EXIT with CPUidle enabled.

So make use of warn_once() so that system is usable.

Thanks to Will for pointers and Lokesh for the analysis of the issue.

Tested-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
index 96093b7..5dc1aa6 100644 (file)
--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -966,7 +966,7 @@ static void reset_ctrl_regs(void *unused)
        }
 
        if (err) {
-               pr_warning("CPU %d debug is powered down!\n", cpu);
+               pr_warn_once("CPU %d debug is powered down!\n", cpu);
                cpumask_or(&debug_err_mask, &debug_err_mask, cpumask_of(cpu));
                return;
        }
@@ -987,7 +987,7 @@ clear_vcr:
        isb();
 
        if (cpumask_intersects(&debug_err_mask, cpumask_of(cpu))) {
-               pr_warning("CPU %d failed to disable vector catch\n", cpu);
+               pr_warn_once("CPU %d failed to disable vector catch\n", cpu);
                return;
        }
 
@@ -1007,7 +1007,7 @@ clear_vcr:
        }
 
        if (cpumask_intersects(&debug_err_mask, cpumask_of(cpu))) {
-               pr_warning("CPU %d failed to clear debug register pairs\n", cpu);
+               pr_warn_once("CPU %d failed to clear debug register pairs\n", cpu);
                return;
        }