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-rw-r--r--arch/arm/mach-s3c2440/mach-gta02.c17
1 files changed, 16 insertions, 1 deletions
diff --git a/arch/arm/mach-s3c2440/mach-gta02.c b/arch/arm/mach-s3c2440/mach-gta02.c
index a32a11e3135..f419537f9af 100644
--- a/arch/arm/mach-s3c2440/mach-gta02.c
+++ b/arch/arm/mach-s3c2440/mach-gta02.c
@@ -1058,11 +1058,26 @@ static struct s3c2410_ts_mach_info gta02_ts_cfg = {
static void gta02_bl_set_intensity(int intensity)
{
struct pcf50633 *pcf = gta02_pcf_pdata.pcf;
- int old_intensity = pcf50633_reg_read(pcf, PCF50633_REG_LEDOUT);
+ int old_intensity;
int ret;
intensity >>= 2;
+ /*
+ * One code path that leads here is from a kernel panic. Trying to turn
+ * the backlight on just gives us a nearly endless stream of complaints
+ * and accomplishes nothing. We can't win. Just give up.
+ *
+ * In the unlikely event that there's another path leading here while
+ * we're atomic, we print at least a warning.
+ */
+ if (in_atomic()) {
+ printk(KERN_ERR
+ "gta02_bl_set_intensity called while atomic\n");
+ return;
+ }
+
+ old_intensity = pcf50633_reg_read(pcf, PCF50633_REG_LEDOUT);
if (intensity == old_intensity)
return;