[PATCH] swsusp: kill one-line helpers, handle read errors

swsusp contains few one-line helpers that only make reading/understanding code
more difficult.  Also warn the user when something goes wrong, instead of
waking machine with corrupt data.
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

kernel/power/swsusp.c

@@ -1001,24 +1001,14 @@ static int __init swsusp_pagedir_relocate(void)
 
 static atomic_t io_done = ATOMIC_INIT(0);
 
-static void start_io(void)
-{
-	atomic_set(&io_done,1);
-}
-
 static int end_io(struct bio * bio, unsigned int num, int err)
 {
-	atomic_set(&io_done,0);
+	if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
+		panic("I/O error reading memory image");
+	atomic_set(&io_done, 0);
 	return 0;
 }
 
-static void wait_io(void)
-{
-	while(atomic_read(&io_done))
-		io_schedule();
-}
-
-
 static struct block_device * resume_bdev;
 
 /**
@@ -1053,9 +1043,12 @@ static int submit(int rw, pgoff_t page_off, void * page)
 
 	if (rw == WRITE)
 		bio_set_pages_dirty(bio);
-	start_io();
+
+	atomic_set(&io_done, 1);
 	submit_bio(rw | (1 << BIO_RW_SYNC), bio);
-	wait_io();
+	while (atomic_read(&io_done))
+		yield();
+
  Done:
 	bio_put(bio);
 	return error;