powerpc/macintosh: Fix unsigned check in smu_sat_get_sdb_partition()
i2c_smbus_read_word_data() returns a s32, which may be negative
but unsigned len cannot be negative.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/drivers/macintosh/windfarm_smu_sat.c b/drivers/macintosh/windfarm_smu_sat.c
index 7f2be4b..7847e98 100644
--- a/drivers/macintosh/windfarm_smu_sat.c
+++ b/drivers/macintosh/windfarm_smu_sat.c
@@ -87,11 +87,12 @@
return NULL;
}
- len = i2c_smbus_read_word_data(&sat->i2c, 9);
- if (len < 0) {
+ err = i2c_smbus_read_word_data(&sat->i2c, 9);
+ if (err < 0) {
printk(KERN_ERR "smu_sat_get_sdb_part rd len error\n");
return NULL;
}
+ len = err;
if (len == 0) {
printk(KERN_ERR "smu_sat_get_sdb_part no partition %x\n", id);
return NULL;