diff options
| -rw-r--r-- | arch/arm/mach-s3c2440/mach-gta02.c | 17 |
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; |