Tighten up periph lock to avoid some races
Make sure the periph lock is held around rmw access to softc data, espeically flags, including work flags in iosched. Add asserts for the periph lock where it should be held. PR: 226510 Sponsored by: Netflix Differential Review: https://reviews.freebsd.org/D14456
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@ -1909,6 +1909,7 @@ daoninvalidate(struct cam_periph *periph)
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{
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struct da_softc *softc;
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cam_periph_assert(periph, MA_OWNED);
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softc = (struct da_softc *)periph->softc;
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/*
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@ -2038,6 +2039,7 @@ daasync(void *callback_arg, u_int32_t code,
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* Handle all UNIT ATTENTIONs except our own,
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* as they will be handled by daerror().
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*/
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cam_periph_lock(periph);
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if (xpt_path_periph(ccb->ccb_h.path) != periph &&
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scsi_extract_sense_ccb(ccb,
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&error_code, &sense_key, &asc, &ascq)) {
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@ -2056,16 +2058,19 @@ daasync(void *callback_arg, u_int32_t code,
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dareprobe(periph);
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}
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}
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cam_periph_unlock(periph);
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break;
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}
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case AC_SCSI_AEN:
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softc = (struct da_softc *)periph->softc;
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cam_periph_lock(periph);
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if (!cam_iosched_has_work_flags(softc->cam_iosched, DA_WORK_TUR)) {
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if (da_periph_acquire(periph, DA_REF_TUR) == 0) {
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cam_iosched_set_work_flags(softc->cam_iosched, DA_WORK_TUR);
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daschedule(periph);
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}
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}
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cam_periph_unlock(periph);
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/* FALLTHROUGH */
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case AC_SENT_BDR:
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case AC_BUS_RESET:
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@ -2077,15 +2082,19 @@ daasync(void *callback_arg, u_int32_t code,
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* Don't fail on the expected unit attention
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* that will occur.
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*/
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cam_periph_lock(periph);
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softc->flags |= DA_FLAG_RETRY_UA;
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LIST_FOREACH(ccbh, &softc->pending_ccbs, periph_links.le)
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ccbh->ccb_state |= DA_CCB_RETRY_UA;
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cam_periph_unlock(periph);
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break;
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}
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case AC_INQ_CHANGED:
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cam_periph_lock(periph);
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softc = (struct da_softc *)periph->softc;
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softc->flags &= ~DA_FLAG_PROBED;
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dareprobe(periph);
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cam_periph_unlock(periph);
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break;
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default:
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break;
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@ -2115,7 +2124,9 @@ dasysctlinit(void *context, int pending)
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snprintf(tmpstr2, sizeof(tmpstr2), "%d", periph->unit_number);
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sysctl_ctx_init(&softc->sysctl_ctx);
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cam_periph_lock(periph);
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softc->flags |= DA_FLAG_SCTX_INIT;
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cam_periph_unlock(periph);
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softc->sysctl_tree = SYSCTL_ADD_NODE_WITH_LABEL(&softc->sysctl_ctx,
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SYSCTL_STATIC_CHILDREN(_kern_cam_da), OID_AUTO, tmpstr2,
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CTLFLAG_RD, 0, tmpstr, "device_index");
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@ -2647,7 +2658,7 @@ daregister(struct cam_periph *periph, void *arg)
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callout_init_mtx(&softc->sendordered_c, cam_periph_mtx(periph), 0);
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callout_reset(&softc->sendordered_c,
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(da_default_timeout * hz) / DA_ORDEREDTAG_INTERVAL,
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dasendorderedtag, softc);
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dasendorderedtag, periph);
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cam_periph_unlock(periph);
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/*
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@ -3075,6 +3086,7 @@ dastart(struct cam_periph *periph, union ccb *start_ccb)
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{
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struct da_softc *softc;
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cam_periph_assert(periph, MA_OWNED);
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softc = (struct da_softc *)periph->softc;
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CAM_DEBUG(periph->path, CAM_DEBUG_TRACE, ("dastart\n"));
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@ -4625,7 +4637,9 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
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((have_sense) &&
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(error_code == SSD_CURRENT_ERROR) &&
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(sense_key == SSD_KEY_ILLEGAL_REQUEST)))) {
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cam_periph_lock(periph);
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softc->flags &= ~DA_FLAG_CAN_RC16;
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cam_periph_unlock(periph);
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free(rdcap, M_SCSIDA);
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xpt_release_ccb(done_ccb);
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softc->state = DA_STATE_PROBE_RC;
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@ -5012,6 +5026,7 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
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"GEOM::rotation_rate", M_NOWAIT);
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}
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cam_periph_assert(periph, MA_OWNED);
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if (ata_params->capabilities1 & ATA_SUPPORT_DMA)
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softc->flags |= DA_FLAG_CAN_ATA_DMA;
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@ -5110,6 +5125,7 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
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{
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int error;
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cam_periph_lock(periph);
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if ((csio->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {
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error = 0;
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softc->valid_logdir_len = 0;
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@ -5163,6 +5179,7 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
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}
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}
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}
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cam_periph_unlock(periph);
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free(csio->data_ptr, M_SCSIDA);
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@ -5180,6 +5197,7 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
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{
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int error;
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cam_periph_lock(periph);
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if ((csio->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {
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off_t entries_offset, max_entries;
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error = 0;
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@ -5250,6 +5268,7 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
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}
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}
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}
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cam_periph_unlock(periph);
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free(csio->data_ptr, M_SCSIDA);
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@ -5341,7 +5360,9 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
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* Supported Capabilities page, clear the
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* flag...
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*/
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cam_periph_lock(periph);
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softc->flags &= ~DA_FLAG_CAN_ATA_SUPCAP;
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cam_periph_unlock(periph);
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/*
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* And clear zone capabilities.
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*/
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@ -5438,8 +5459,10 @@ dadone(struct cam_periph *periph, union ccb *done_ccb)
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if (error == ERESTART)
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return;
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else if (error != 0) {
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cam_periph_lock(periph);
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softc->flags &= ~DA_FLAG_CAN_ATA_ZONE;
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softc->flags &= ~DA_ZONE_FLAG_SET_MASK;
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cam_periph_unlock(periph);
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if ((done_ccb->ccb_h.status &
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CAM_DEV_QFRZN) != 0) {
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@ -5588,6 +5611,8 @@ daerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
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periph = xpt_path_periph(ccb->ccb_h.path);
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softc = (struct da_softc *)periph->softc;
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cam_periph_assert(periph, MA_OWNED);
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/*
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* Automatically detect devices that do not support
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* READ(6)/WRITE(6) and upgrade to using 10 byte cdbs.
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@ -5682,6 +5707,7 @@ daprevent(struct cam_periph *periph, int action)
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union ccb *ccb;
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int error;
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cam_periph_assert(periph, MA_OWNED);
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softc = (struct da_softc *)periph->softc;
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if (((action == PR_ALLOW)
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@ -5837,8 +5863,10 @@ dasetgeom(struct cam_periph *periph, uint32_t block_len, uint64_t maxsector,
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static void
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dasendorderedtag(void *arg)
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{
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struct da_softc *softc = arg;
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struct cam_periph *periph = arg;
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struct da_softc *softc = periph->softc;
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cam_periph_assert(periph, MA_OWNED);
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if (da_send_ordered) {
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if (!LIST_EMPTY(&softc->pending_ccbs)) {
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if ((softc->flags & DA_FLAG_WAS_OTAG) == 0)
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@ -5846,10 +5874,11 @@ dasendorderedtag(void *arg)
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softc->flags &= ~DA_FLAG_WAS_OTAG;
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}
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}
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/* Queue us up again */
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callout_reset(&softc->sendordered_c,
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(da_default_timeout * hz) / DA_ORDEREDTAG_INTERVAL,
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dasendorderedtag, softc);
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dasendorderedtag, periph);
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}
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/*
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