[PATCH] fs: prevent hang on suspend/resume when MMC/SD card presen=

[Matt Reimer]

Devices can come and go from the MMC/SD bus during suspend or resume,
when the writeback thread is frozen, resulting in a hang. So thaw the
writeback thread in del_gendisk() to prevent the hang.

Signed-off-by: Matt Reimer <mreimer@xxxxxxxxxxxxxx>
---
 fs/partitions/check.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index e238ab2..b303919 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -666,6 +666,8 @@ void del_gendisk(struct gendisk *disk)
        struct disk_part_iter piter;
        struct hd_struct *part;

+       thaw_process(disk->queue->backing_dev_info.wb.task);
+
        /* invalidate stuff */
        disk_part_iter_init(&piter, disk,
                             DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE);
--=20
1.7.0.4

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