[PATCH] KVM: fix lockup on 32-bit intel hosts with nx disabled in the bios

[pandora-kernel.git] / fs / block_dev.c

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 1715d6b..d9bdf2b 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -146,7 +146,7 @@ static int blk_end_aio(struct bio *bio, unsigned int bytes_done, int error)
                iocb->ki_nbytes = -EIO;
 
        if (atomic_dec_and_test(bio_count)) {
-               if (iocb->ki_nbytes < 0)
+               if ((long)iocb->ki_nbytes < 0)
                        aio_complete(iocb, iocb->ki_nbytes, 0);
                else
                        aio_complete(iocb, iocb->ki_left, 0);
@@ -190,6 +190,12 @@ static struct page *blk_get_page(unsigned long addr, size_t count, int rw,
        return pvec->page[pvec->idx++];
 }
 
+/* return a page back to pvec array */
+static void blk_unget_page(struct page *page, struct pvec *pvec)
+{
+       pvec->page[--pvec->idx] = page;
+}
+
 static ssize_t
 blkdev_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
                 loff_t pos, unsigned long nr_segs)
@@ -278,6 +284,8 @@ same_bio:
                                count = min(count, nbytes);
                                goto same_bio;
                        }
+               } else {
+                       blk_unget_page(page, &pvec);
                }
 
                /* bio is ready, submit it */
@@ -411,7 +419,7 @@ static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flag
        {
                memset(bdev, 0, sizeof(*bdev));
                mutex_init(&bdev->bd_mutex);
-               mutex_init(&bdev->bd_mount_mutex);
+               sema_init(&bdev->bd_mount_sem, 1);
                INIT_LIST_HEAD(&bdev->bd_inodes);
                INIT_LIST_HEAD(&bdev->bd_list);
 #ifdef CONFIG_SYSFS