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authorNitin Gupta <ngupta@vflare.org>2010-12-30 04:07:58 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2010-12-30 12:07:22 -0800
commite983dc2428164698571e1dd1b25c4322181adbac (patch)
tree8daebe3e685971ea0db8ddc0dcda96a1781019b2
parentff20f1779b7f60a9682aa8d62f8ca3b650e4c360 (diff)
Revert "Staging: zram: work around oops due to startup ordering snafu"
This reverts commit 7e24cce38a99f373450db67bf576fe73e8168d66 because it was never appropriate for mainline. Do not check for init flag before starting I/O - zram module is unusable without this fix. The oops mentioned in the reverted commit message was actually a problem only with the zram version as present in project's own repository where we allocate struct zram_stats_cpu upon device initialization. OTOH, In mainline/staging version of zram, we allocate struct stats upfront, so this oops cannot happen in mainline version. Checking for init_done flag in zram_make_request() results in a *no-op* for any I/O operation since we simply always return success. This flag is actually set when the first write occurs on a zram disk which triggers its initialization. Bug report: https://bugzilla.kernel.org/show_bug.cgi?id=25722 Reported-by: Dennis Jansen <dennis.jansen@web.de> Signed-off-by: Nitin Gupta <ngupta@vflare.org> Cc: Anton Blanchard <anton@samba.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/staging/zram/zram_drv.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 8c3c057aa84..d0e9e020753 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -435,12 +435,6 @@ static int zram_make_request(struct request_queue *queue, struct bio *bio)
int ret = 0;
struct zram *zram = queue->queuedata;
- if (unlikely(!zram->init_done)) {
- set_bit(BIO_UPTODATE, &bio->bi_flags);
- bio_endio(bio, 0);
- return 0;
- }
-
if (!valid_io_request(zram, bio)) {
zram_stat64_inc(zram, &zram->stats.invalid_io);
bio_io_error(bio);