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SubjectRe: [PATCH v4 4/7] scsi: sr: block events when runtime suspended
Hello,

Not sure if I should use EXPORT_SYMBOL or EXPORT_SYMBOL_GPL, any
comments?

Thanks,
Aaron

On 07/27/2012 05:00 PM, Aaron Lu wrote:
> When the ODD is runtime suspended, there is no need to poll it for
> events, so block events poll for it and unblock when resumed.
>
> Signed-off-by: Aaron Lu <aaron.lu@amd.com>
> ---
> block/genhd.c | 2 ++
> drivers/scsi/sr.c | 7 ++++---
> 2 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/block/genhd.c b/block/genhd.c
> index 9cf5583..bdb3682 100644
> --- a/block/genhd.c
> +++ b/block/genhd.c
> @@ -1458,6 +1458,7 @@ void disk_block_events(struct gendisk *disk)
>
> mutex_unlock(&ev->block_mutex);
> }
> +EXPORT_SYMBOL(disk_block_events);
>
> static void __disk_unblock_events(struct gendisk *disk, bool check_now)
> {
> @@ -1502,6 +1503,7 @@ void disk_unblock_events(struct gendisk *disk)
> if (disk->ev)
> __disk_unblock_events(disk, false);
> }
> +EXPORT_SYMBOL(disk_unblock_events);
>
> /**
> * disk_flush_events - schedule immediate event checking and flushing
> diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
> index acfd10a..cbc14ea 100644
> --- a/drivers/scsi/sr.c
> +++ b/drivers/scsi/sr.c
> @@ -205,6 +205,8 @@ static int sr_suspend(struct device *dev, pm_message_t msg)
> return -EBUSY;
> }
>
> + disk_block_events(cd->disk);
> +
> return 0;
> }
>
> @@ -226,6 +228,8 @@ static int sr_resume(struct device *dev)
> atomic_set(&cd->suspend_count, 1);
> }
>
> + disk_unblock_events(cd->disk);
> +
> return 0;
> }
>
> @@ -314,9 +318,6 @@ static unsigned int sr_check_events(struct cdrom_device_info *cdi,
> if (CDSL_CURRENT != slot)
> return 0;
>
> - if (pm_runtime_suspended(&cd->device->sdev_gendev))
> - return 0;
> -
> /* if the logical unit just finished loading/unloading, do a TUR */
> if (cd->device->can_power_off && cd->dbml && sr_unit_load_done(cd)) {
> events = 0;
>




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