I'm not familiar with the zram code, but looking through the code and
init_done flag it's obvious what is going on rather then looking at
zram->meta field checks.
On 9/6/13, Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> wrote:
> `zram->init_done != 0' equals to `zram->meta != NULL', so init_done
> can be removed.
>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
>
> ---
>
> drivers/staging/zram/zram_drv.c | 18 +++++++-----------
> drivers/staging/zram/zram_drv.h | 1 -
> 2 files changed, 7 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/staging/zram/zram_drv.c
> b/drivers/staging/zram/zram_drv.c
> index 17386e2..34b72ea 100644
> --- a/drivers/staging/zram/zram_drv.c
> +++ b/drivers/staging/zram/zram_drv.c
> @@ -60,7 +60,7 @@ static ssize_t initstate_show(struct device *dev,
> {
> struct zram *zram = dev_to_zram(dev);
>
> - return sprintf(buf, "%u\n", zram->init_done);
> + return sprintf(buf, "%u\n", zram->meta != NULL);
> }
>
> static ssize_t num_reads_show(struct device *dev,
> @@ -133,7 +133,7 @@ static ssize_t mem_used_total_show(struct device *dev,
> struct zram_meta *meta = zram->meta;
>
> down_read(&zram->init_lock);
> - if (zram->init_done)
> + if (meta)
> val = zs_get_total_size_bytes(meta->mem_pool);
> up_read(&zram->init_lock);
>
> @@ -556,14 +556,12 @@ static void zram_reset_device(struct zram *zram, bool
> reset_capacity)
> flush_work(&zram->free_work);
>
> down_write(&zram->init_lock);
> - if (!zram->init_done) {
> + if (!zram->meta) {
> up_write(&zram->init_lock);
> return;
> }
>
> meta = zram->meta;
> - zram->init_done = 0;
> -
> /* Free all pages that are still in this zram device */
> for (index = 0; index < zram->disksize >> PAGE_SHIFT; index++) {
> unsigned long handle = meta->table[index].handle;
> @@ -573,7 +571,7 @@ static void zram_reset_device(struct zram *zram, bool
> reset_capacity)
> zs_free(meta->mem_pool, handle);
> }
>
> - zram_meta_free(zram->meta);
> + zram_meta_free(meta);
> zram->meta = NULL;
> /* Reset stats */
> memset(&zram->stats, 0, sizeof(zram->stats));
> @@ -602,9 +600,7 @@ static void zram_init_device(struct zram *zram, struct
> zram_meta *meta)
>
> /* zram devices sort of resembles non-rotational disks */
> queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
> -
> zram->meta = meta;
> - zram->init_done = 1;
>
> pr_debug("Initialization done!\n");
> }
> @@ -623,7 +619,7 @@ static ssize_t disksize_store(struct device *dev,
> disksize = PAGE_ALIGN(disksize);
> meta = zram_meta_alloc(disksize);
> down_write(&zram->init_lock);
> - if (zram->init_done) {
> + if (zram->meta) {
> up_write(&zram->init_lock);
> zram_meta_free(meta);
> pr_info("Cannot change disksize for initialized device\n");
> @@ -731,7 +727,7 @@ static void zram_make_request(struct request_queue
> *queue, struct bio *bio)
> struct zram *zram = queue->queuedata;
>
> down_read(&zram->init_lock);
> - if (unlikely(!zram->init_done))
> + if (unlikely(!zram->meta))
> goto error;
>
> if (!valid_io_request(zram, bio)) {
> @@ -880,7 +876,7 @@ static int create_device(struct zram *zram, int
> device_id)
> goto out_free_disk;
> }
>
> - zram->init_done = 0;
> + zram->meta = NULL;
> return 0;
>
> out_free_disk:
> diff --git a/drivers/staging/zram/zram_drv.h
> b/drivers/staging/zram/zram_drv.h
> index 97a3acf..b1100cf 100644
> --- a/drivers/staging/zram/zram_drv.h
> +++ b/drivers/staging/zram/zram_drv.h
> @@ -110,7 +110,6 @@ struct zram {
>
> struct request_queue *queue;
> struct gendisk *disk;
> - int init_done;
> /* Prevent concurrent execution of device init, reset and R/W request */
> struct rw_semaphore init_lock;
> /*
>
> _______________________________________________
> devel mailing list
> devel@xxxxxxxxxxxxxxxxxxxxxx
> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
>
--
Regards,
Denis
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