From 9f8a2c23c6c1140f515f601265c4dff7522110b7 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Wed, 8 Dec 2010 20:57:40 +0100 Subject: scsi: replace sr_test_unit_ready() with scsi_test_unit_ready() The usage of TUR has been confusing involving several different commits updating different parts over time. Currently, the only differences between scsi_test_unit_ready() and sr_test_unit_ready() are, * scsi_test_unit_ready() also sets sdev->changed on NOT_READY. * scsi_test_unit_ready() returns 0 if TUR ended with UNIT_ATTENTION or NOT_READY. Due to the above two differences, sr is using its own sr_test_unit_ready(), but sd - the sole user of the above extra handling - doesn't even need them. Where scsi_test_unit_ready() is used in sd_media_changed(), the code is looking for device ready w/ media present state which is true iff TUR succeeds w/o sense data or UA, and when the device is not ready for whatever reason sd_media_changed() explicitly marks media as missing so there's no reason to set sdev->changed automatically from scsi_test_unit_ready() on NOT_READY. Drop both special handlings from scsi_test_unit_ready(), which makes it equivalant to sr_test_unit_ready(), and replace sr_test_unit_ready() with scsi_test_unit_ready(). Also, drop the unnecessary explicit NOT_READY check from sd_media_changed(). Checking return value is enough for testing device readiness. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe --- drivers/scsi/scsi_lib.c | 13 +------------ drivers/scsi/sd.c | 10 +--------- drivers/scsi/sr.c | 31 +++---------------------------- drivers/scsi/sr.h | 1 - drivers/scsi/sr_ioctl.c | 2 +- 5 files changed, 6 insertions(+), 51 deletions(-) (limited to 'drivers/scsi') diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index eafeeda6e194..13bf89145b18 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1984,8 +1984,7 @@ EXPORT_SYMBOL(scsi_mode_sense); * in. * * Returns zero if unsuccessful or an error if TUR failed. For - * removable media, a return of NOT_READY or UNIT_ATTENTION is - * translated to success, with the ->changed flag updated. + * removable media, UNIT_ATTENTION sets ->changed flag. **/ int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries, @@ -2012,16 +2011,6 @@ scsi_test_unit_ready(struct scsi_device *sdev, int timeout, int retries, } while (scsi_sense_valid(sshdr) && sshdr->sense_key == UNIT_ATTENTION && --retries); - if (!sshdr) - /* could not allocate sense buffer, so can't process it */ - return result; - - if (sdev->removable && scsi_sense_valid(sshdr) && - (sshdr->sense_key == UNIT_ATTENTION || - sshdr->sense_key == NOT_READY)) { - sdev->changed = 1; - result = 0; - } if (!sshdr_external) kfree(sshdr); return result; diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index b9ab3a590e4b..8d488a9fef00 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1045,15 +1045,7 @@ static int sd_media_changed(struct gendisk *disk) sshdr); } - /* - * Unable to test, unit probably not ready. This usually - * means there is no disc in the drive. Mark as changed, - * and we will figure it out later once the drive is - * available again. - */ - if (retval || (scsi_sense_valid(sshdr) && - /* 0x3a is medium not present */ - sshdr->asc == 0x3a)) { + if (retval) { set_media_not_present(sdkp); retval = 1; goto out; diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index c7e29bdec2cd..310b3fac6313 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -165,32 +165,6 @@ static void scsi_cd_put(struct scsi_cd *cd) mutex_unlock(&sr_ref_mutex); } -/* identical to scsi_test_unit_ready except that it doesn't - * eat the NOT_READY returns for removable media */ -int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) -{ - int retries = MAX_RETRIES; - int the_result; - u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 }; - - /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION - * conditions are gone, or a timeout happens - */ - do { - the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, - 0, sshdr, SR_TIMEOUT, - retries--, NULL); - if (scsi_sense_valid(sshdr) && - sshdr->sense_key == UNIT_ATTENTION) - sdev->changed = 1; - - } while (retries > 0 && - (!scsi_status_is_good(the_result) || - (scsi_sense_valid(sshdr) && - sshdr->sense_key == UNIT_ATTENTION))); - return the_result; -} - /* * This function checks to see if the media has been changed in the * CDROM drive. It is possible that we have already sensed a change, @@ -213,7 +187,8 @@ static int sr_media_change(struct cdrom_device_info *cdi, int slot) } sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); - retval = sr_test_unit_ready(cd->device, sshdr); + retval = scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, + sshdr); /* * Media is considered to be present if TUR succeeds or fails with * sense data indicating something other than media-not-present @@ -784,7 +759,7 @@ static void get_capabilities(struct scsi_cd *cd) } /* eat unit attentions */ - sr_test_unit_ready(cd->device, &sshdr); + scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr); /* ask for mode page 0x2a */ rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, diff --git a/drivers/scsi/sr.h b/drivers/scsi/sr.h index 1e144dfdbd4b..81fbc0b78a52 100644 --- a/drivers/scsi/sr.h +++ b/drivers/scsi/sr.h @@ -61,7 +61,6 @@ int sr_select_speed(struct cdrom_device_info *cdi, int speed); int sr_audio_ioctl(struct cdrom_device_info *, unsigned int, void *); int sr_is_xa(Scsi_CD *); -int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr); /* sr_vendor.c */ void sr_vendor_init(Scsi_CD *); diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c index 3cd8ffbad577..8be30554119b 100644 --- a/drivers/scsi/sr_ioctl.c +++ b/drivers/scsi/sr_ioctl.c @@ -307,7 +307,7 @@ int sr_drive_status(struct cdrom_device_info *cdi, int slot) /* we have no changer support */ return -EINVAL; } - if (0 == sr_test_unit_ready(cd->device, &sshdr)) + if (!scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr)) return CDS_DISC_OK; /* SK/ASC/ASCQ of 2/4/1 means "unit is becoming ready" */ -- cgit