From: Nitin Gupta Date: Thu, 30 Dec 2010 09:07:58 +0000 (-0500) Subject: Revert "Staging: zram: work around oops due to startup ordering snafu" X-Git-Tag: v2.6.37~15 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e983dc2428164698571e1dd1b25c4322181adbac;p=karo-tx-linux.git 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 Signed-off-by: Nitin Gupta Cc: Anton Blanchard Cc: Andrew Morton Cc: Greg Kroah-Hartman Signed-off-by: Linus Torvalds --- diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c index 8c3c057aa847..d0e9e0207539 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);