[media] x86/mm/pat, drivers/media/ivtv: move pat warn and replace WARN() with pr_warn()

On built-in kernels this warning will always splat as this is part
of the module init. Fix that by shifting the PAT requirement check
out under the code that does the "quasi-probe" for the device. This
device driver relies on an existing driver to find its own devices,
it looks for that device driver and its own found devices, then
uses driver_for_each_device() to try to see if it can probe each of
those devices as a frambuffer device with ivtvfb_init_card(). We
tuck the PAT requiremenet check then on the ivtvfb_init_card()
call making the check at least require an ivtv device present
before complaining.

Reported-by: Fengguang Wu <fengguang.wu@intel.com> [0-day test robot]
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/pci/ivtv/ivtvfb.c b/drivers/media/pci/ivtv/ivtvfb.c
index 4cb365d4ffdcc9c4e12cde82f46d411cb86c7a13..8b95eefb610b4097787a7363c6e43b94ce260efb 100644 (file)
--- a/drivers/media/pci/ivtv/ivtvfb.c
+++ b/drivers/media/pci/ivtv/ivtvfb.c
@@ -38,6 +38,8 @@
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/fb.h>
@@ -1171,6 +1173,13 @@ static int ivtvfb_init_card(struct ivtv *itv)
 {
        int rc;
 
+#ifdef CONFIG_X86_64
+       if (pat_enabled()) {
+               pr_warn("ivtvfb needs PAT disabled, boot with nopat kernel parameter\n");
+               return -ENODEV;
+       }
+#endif
+
        if (itv->osd_info) {
                IVTVFB_ERR("Card %d already initialised\n", ivtvfb_card_id);
                return -EBUSY;
@@ -1265,12 +1274,6 @@ static int __init ivtvfb_init(void)
        int registered = 0;
        int err;
 
-#ifdef CONFIG_X86_64
-       if (WARN(pat_enabled(),
-                "ivtvfb needs PAT disabled, boot with nopat kernel parameter\n")) {
-               return -ENODEV;
-       }
-#endif
 
        if (ivtvfb_card_id < -1 || ivtvfb_card_id >= IVTV_MAX_CARDS) {
                printk(KERN_ERR "ivtvfb:  ivtvfb_card_id parameter is out of range (valid range: -1 - %d)\n",