Author: mav
Date: Tue Feb 28 11:56:17 2017
New Revision: 314387
URL: https://svnweb.freebsd.org/changeset/base/314387
Log:
Make ctl_queue_sense() not sleep.
It may be called in non-sleepable frontend context.
MFC after: 2 weeks
Modified:
head/sys/cam/ctl/ctl.c
Modified: head/sys/cam/ctl/ctl.c
==============================================================================
--- head/sys/cam/ctl/ctl.c Tue Feb 28 11:42:04 2017 (r314386)
+++ head/sys/cam/ctl/ctl.c Tue Feb 28 11:56:17 2017 (r314387)
@@ -13146,21 +13146,15 @@ ctl_queue_sense(union ctl_io *io)
initidx = ctl_get_initindex(&io->io_hdr.nexus);
p = initidx / CTL_MAX_INIT_PER_PORT;
- if ((ps = lun->pending_sense[p]) == NULL) {
- mtx_unlock(&lun->lun_lock);
- ps = malloc(sizeof(*ps) * CTL_MAX_INIT_PER_PORT, M_CTL,
- M_WAITOK | M_ZERO);
- mtx_lock(&lun->lun_lock);
- if (lun->pending_sense[p] == NULL) {
- lun->pending_sense[p] = ps;
- } else {
- free(ps, M_CTL);
- ps = lun->pending_sense[p];
- }
+ if (lun->pending_sense[p] == NULL) {
+ lun->pending_sense[p] = malloc(sizeof(*ps) *
CTL_MAX_INIT_PER_PORT,
+ M_CTL, M_NOWAIT | M_ZERO);
+ }
+ if ((ps = lun->pending_sense[p]) != NULL) {
+ ps += initidx % CTL_MAX_INIT_PER_PORT;
+ memset(ps, 0, sizeof(*ps));
+ memcpy(ps, &io->scsiio.sense_data, io->scsiio.sense_len);
}
- ps += initidx % CTL_MAX_INIT_PER_PORT;
- memset(ps, 0, sizeof(*ps));
- memcpy(ps, &io->scsiio.sense_data, io->scsiio.sense_len);
mtx_unlock(&lun->lun_lock);
bailout:
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