From: Alan Stern Date: Wed, 11 Oct 2006 20:48:28 +0000 (-0400) Subject: [SCSI] Reduce polling in sd.c X-Git-Tag: v2.6.20-rc2~6^2~13^2~5^2~71 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=b4d38e38e66f8e1b32a1b1c00e533175314c8d56;p=linux-2.6-omap-h63xx.git [SCSI] Reduce polling in sd.c If a drive reports that no media is present, there's no point in continuing to ask it about media status. This patch (as696) cuts the TUR polling short as soon as the drive reports no media instead of going a full 3 iterations. Signed-off-by: Alan Stern Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 84ff203ffed..152f4ff4ed7 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1051,6 +1051,14 @@ sd_spinup_disk(struct scsi_disk *sdkp, char *diskname) &sshdr, SD_TIMEOUT, SD_MAX_RETRIES); + /* + * If the drive has indicated to us that it + * doesn't have any media in it, don't bother + * with any more polling. + */ + if (media_not_present(sdkp, &sshdr)) + return; + if (the_result) sense_valid = scsi_sense_valid(&sshdr); retries++; @@ -1059,14 +1067,6 @@ sd_spinup_disk(struct scsi_disk *sdkp, char *diskname) ((driver_byte(the_result) & DRIVER_SENSE) && sense_valid && sshdr.sense_key == UNIT_ATTENTION))); - /* - * If the drive has indicated to us that it doesn't have - * any media in it, don't bother with any of the rest of - * this crap. - */ - if (media_not_present(sdkp, &sshdr)) - return; - if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { /* no sense, TUR either succeeded or failed * with a status error */