HAX: kernel/swsusp: Show invalid swap signature

Commit Message

Chris Wilson Oct. 27, 2017, 8:50 p.m. UTC

---
 kernel/power/swap.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

Patch

diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index d7cdc426ee38..1eed3fa04e21 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -306,9 +306,12 @@  static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
 {
 	int error;
 
-	hib_submit_io(REQ_OP_READ, 0, swsusp_resume_block,
-		      swsusp_header, NULL);
-	if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
+	error = hib_submit_io(REQ_OP_READ, 0, swsusp_resume_block,
+			      swsusp_header, NULL);
+	if (error) {
+		printk(KERN_ERR "PM: Unable to read Swap header, error %d.\n",
+		       error);
+	} else if (!memcmp("SWAP-SPACE",swsusp_header->sig, 10) ||
 	    !memcmp("SWAPSPACE2",swsusp_header->sig, 10)) {
 		memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
 		memcpy(swsusp_header->sig, HIBERNATE_SIG, 10);
@@ -319,7 +322,8 @@  static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
 		error = hib_submit_io(REQ_OP_WRITE, REQ_SYNC,
 				      swsusp_resume_block, swsusp_header, NULL);
 	} else {
-		printk(KERN_ERR "PM: Swap header not found!\n");
+		printk(KERN_ERR "PM: Swap header not found! Found %10s instead.\n",
+		       swsusp_header->sig);
 		error = -ENODEV;
 	}
 	return error;