From: Tejun Heo Date: Fri, 9 Jan 2009 10:19:14 +0000 (+0900) Subject: libata: use WARN_ON_ONCE on hot paths X-Git-Tag: v2.6.29-rc1~35 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=efcb3cf7f00c3c424db012380a8a974c2676a3c8;p=linux-2.6-omap-h63xx.git libata: use WARN_ON_ONCE on hot paths Convert WARN_ON() on command issue/completion paths to WARN_ON_ONCE() so that libata doesn't spam the machine even when one of those conditions triggers repeatedly. Signed-off-by: Tejun Heo Signed-off-by: Linus Torvalds --- diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 175df54eb66..c507a9ac78f 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4556,7 +4556,7 @@ void ata_sg_clean(struct ata_queued_cmd *qc) struct scatterlist *sg = qc->sg; int dir = qc->dma_dir; - WARN_ON(sg == NULL); + WARN_ON_ONCE(sg == NULL); VPRINTK("unmapping %u sg elements\n", qc->n_elem); @@ -4776,7 +4776,7 @@ void ata_qc_free(struct ata_queued_cmd *qc) struct ata_port *ap = qc->ap; unsigned int tag; - WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ + WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ qc->flags = 0; tag = qc->tag; @@ -4791,8 +4791,8 @@ void __ata_qc_complete(struct ata_queued_cmd *qc) struct ata_port *ap = qc->ap; struct ata_link *link = qc->dev->link; - WARN_ON(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ - WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE)); + WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */ + WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE)); if (likely(qc->flags & ATA_QCFLAG_DMAMAP)) ata_sg_clean(qc); @@ -4878,7 +4878,7 @@ void ata_qc_complete(struct ata_queued_cmd *qc) struct ata_device *dev = qc->dev; struct ata_eh_info *ehi = &dev->link->eh_info; - WARN_ON(ap->pflags & ATA_PFLAG_FROZEN); + WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN); if (unlikely(qc->err_mask)) qc->flags |= ATA_QCFLAG_FAILED; @@ -5000,16 +5000,16 @@ void ata_qc_issue(struct ata_queued_cmd *qc) * check is skipped for old EH because it reuses active qc to * request ATAPI sense. */ - WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag)); + WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag)); if (ata_is_ncq(prot)) { - WARN_ON(link->sactive & (1 << qc->tag)); + WARN_ON_ONCE(link->sactive & (1 << qc->tag)); if (!link->sactive) ap->nr_active_links++; link->sactive |= 1 << qc->tag; } else { - WARN_ON(link->sactive); + WARN_ON_ONCE(link->sactive); ap->nr_active_links++; link->active_tag = qc->tag; diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c index c59ad76c84b..0eae9b45355 100644 --- a/drivers/ata/libata-sff.c +++ b/drivers/ata/libata-sff.c @@ -578,7 +578,7 @@ void ata_sff_tf_load(struct ata_port *ap, const struct ata_taskfile *tf) } if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) { - WARN_ON(!ioaddr->ctl_addr); + WARN_ON_ONCE(!ioaddr->ctl_addr); iowrite8(tf->hob_feature, ioaddr->feature_addr); iowrite8(tf->hob_nsect, ioaddr->nsect_addr); iowrite8(tf->hob_lbal, ioaddr->lbal_addr); @@ -651,7 +651,7 @@ void ata_sff_tf_read(struct ata_port *ap, struct ata_taskfile *tf) iowrite8(tf->ctl, ioaddr->ctl_addr); ap->last_ctl = tf->ctl; } else - WARN_ON(1); + WARN_ON_ONCE(1); } } EXPORT_SYMBOL_GPL(ata_sff_tf_read); @@ -891,7 +891,7 @@ static void ata_pio_sectors(struct ata_queued_cmd *qc) /* READ/WRITE MULTIPLE */ unsigned int nsect; - WARN_ON(qc->dev->multi_count == 0); + WARN_ON_ONCE(qc->dev->multi_count == 0); nsect = min((qc->nbytes - qc->curbytes) / qc->sect_size, qc->dev->multi_count); @@ -918,7 +918,7 @@ static void atapi_send_cdb(struct ata_port *ap, struct ata_queued_cmd *qc) { /* send SCSI cdb */ DPRINTK("send cdb\n"); - WARN_ON(qc->dev->cdb_len < 12); + WARN_ON_ONCE(qc->dev->cdb_len < 12); ap->ops->sff_data_xfer(qc->dev, qc->cdb, qc->dev->cdb_len, 1); ata_sff_sync(ap); @@ -1014,7 +1014,7 @@ next_sg: } /* consumed can be larger than count only for the last transfer */ - WARN_ON(qc->cursg && count != consumed); + WARN_ON_ONCE(qc->cursg && count != consumed); if (bytes) goto next_sg; @@ -1172,13 +1172,13 @@ int ata_sff_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc, unsigned long flags = 0; int poll_next; - WARN_ON((qc->flags & ATA_QCFLAG_ACTIVE) == 0); + WARN_ON_ONCE((qc->flags & ATA_QCFLAG_ACTIVE) == 0); /* Make sure ata_sff_qc_issue() does not throw things * like DMA polling into the workqueue. Notice that * in_wq is not equivalent to (qc->tf.flags & ATA_TFLAG_POLLING). */ - WARN_ON(in_wq != ata_hsm_ok_in_wq(ap, qc)); + WARN_ON_ONCE(in_wq != ata_hsm_ok_in_wq(ap, qc)); fsm_start: DPRINTK("ata%u: protocol %d task_state %d (dev_stat 0x%X)\n", @@ -1387,7 +1387,7 @@ fsm_start: DPRINTK("ata%u: dev %u command complete, drv_stat 0x%x\n", ap->print_id, qc->dev->devno, status); - WARN_ON(qc->err_mask & (AC_ERR_DEV | AC_ERR_HSM)); + WARN_ON_ONCE(qc->err_mask & (AC_ERR_DEV | AC_ERR_HSM)); ap->hsm_task_state = HSM_ST_IDLE; @@ -1423,7 +1423,7 @@ void ata_pio_task(struct work_struct *work) int poll_next; fsm_start: - WARN_ON(ap->hsm_task_state == HSM_ST_IDLE); + WARN_ON_ONCE(ap->hsm_task_state == HSM_ST_IDLE); /* * This is purely heuristic. This is a fast path. @@ -1512,7 +1512,7 @@ unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc) break; case ATA_PROT_DMA: - WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING); + WARN_ON_ONCE(qc->tf.flags & ATA_TFLAG_POLLING); ap->ops->sff_tf_load(ap, &qc->tf); /* load tf registers */ ap->ops->bmdma_setup(qc); /* set up bmdma */ @@ -1564,7 +1564,7 @@ unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc) break; case ATAPI_PROT_DMA: - WARN_ON(qc->tf.flags & ATA_TFLAG_POLLING); + WARN_ON_ONCE(qc->tf.flags & ATA_TFLAG_POLLING); ap->ops->sff_tf_load(ap, &qc->tf); /* load tf registers */ ap->ops->bmdma_setup(qc); /* set up bmdma */ @@ -1576,7 +1576,7 @@ unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc) break; default: - WARN_ON(1); + WARN_ON_ONCE(1); return AC_ERR_SYSTEM; }