From patchwork Wed Sep 12 08:29:53 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [v7,2/6] scsi: sr: support runtime pm From: Aaron Lu X-Patchwork-Id: 183281 Message-Id: <1347438597-5903-3-git-send-email-aaron.lu@intel.com> To: Alan Stern , Oliver Neukum , James Bottomley , Jeff Garzik Cc: linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, linux-acpi@vger.kernel.org, linux-pm@vger.kernel.org, Aaron Lu , Aaron Lu Date: Wed, 12 Sep 2012 16:29:53 +0800 Place the ODD into runtime suspend state as soon as there is nobody using it. The only exception is, if we just find that a new medium is inserted, we wait for the next events checking to idle it. Based on ideas of Alan Stern and Oliver Neukum. Signed-off-by: Aaron Lu --- drivers/scsi/sr.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 5fc97d2..7a8222f 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -45,6 +45,7 @@ #include #include #include +#include #include #include @@ -146,8 +147,12 @@ static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) kref_get(&cd->kref); if (scsi_device_get(cd->device)) goto out_put; + if (scsi_autopm_get_device(cd->device)) + goto out_pm; goto out; + out_pm: + scsi_device_put(cd->device); out_put: kref_put(&cd->kref, sr_kref_release); cd = NULL; @@ -163,6 +168,7 @@ static void scsi_cd_put(struct scsi_cd *cd) mutex_lock(&sr_ref_mutex); kref_put(&cd->kref, sr_kref_release); scsi_device_put(sdev); + scsi_autopm_put_device(sdev); mutex_unlock(&sr_ref_mutex); } @@ -211,7 +217,7 @@ static unsigned int sr_check_events(struct cdrom_device_info *cdi, unsigned int clearing, int slot) { struct scsi_cd *cd = cdi->handle; - bool last_present; + bool last_present = cd->media_present; struct scsi_sense_hdr sshdr; unsigned int events; int ret; @@ -220,6 +226,8 @@ static unsigned int sr_check_events(struct cdrom_device_info *cdi, if (CDSL_CURRENT != slot) return 0; + scsi_autopm_get_device(cd->device); + events = sr_get_events(cd->device); cd->get_event_changed |= events & DISK_EVENT_MEDIA_CHANGE; @@ -246,10 +254,9 @@ static unsigned int sr_check_events(struct cdrom_device_info *cdi, } if (!(clearing & DISK_EVENT_MEDIA_CHANGE)) - return events; + goto out; do_tur: /* let's see whether the media is there with TUR */ - last_present = cd->media_present; ret = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); /* @@ -270,7 +277,7 @@ do_tur: } if (cd->ignore_get_event) - return events; + goto out; /* check whether GET_EVENT is reporting spurious MEDIA_CHANGE */ if (!cd->tur_changed) { @@ -287,6 +294,12 @@ do_tur: cd->tur_changed = false; cd->get_event_changed = false; +out: + if (cd->media_present && !last_present) + pm_runtime_put_noidle(&cd->device->sdev_gendev); + else + scsi_autopm_put_device(cd->device); + return events; } @@ -715,9 +728,14 @@ static int sr_probe(struct device *dev) dev_set_drvdata(dev, cd); disk->flags |= GENHD_FL_REMOVABLE; add_disk(disk); + disk_events_set_poll_msecs(disk, 5000); sdev_printk(KERN_DEBUG, sdev, "Attached scsi CD-ROM %s\n", cd->cdi.name); + + /* enable runtime pm */ + scsi_autopm_put_device(cd->device); + return 0; fail_put: @@ -965,6 +983,9 @@ static int sr_remove(struct device *dev) { struct scsi_cd *cd = dev_get_drvdata(dev); + /* disable runtime pm */ + scsi_autopm_get_device(cd->device); + blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); del_gendisk(cd->disk);