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- Fix races on detach handling of AAC_IFFLAGS_* mask

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- Fix races on setting AAC_AIFFLAGS_ALLOCFIBS
- Remove some unused AAC_IFFLAGS_* bits.
  Please note that the kthread still makes a difference between the
  total mask and AAC_AIFFLAGS_ALLOCFIBS because more flags may be
  added in the future to aifflags.

Sponsored by:			Sandvine Incorporated
Reported and reviewed by:	emaste
MFC after:			2 weeks
This commit is contained in:
Attilio Rao 2011-06-10 20:23:56 +00:00
parent 1c3bf59584
commit 1bd320ec51
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=222951
2 changed files with 16 additions and 14 deletions
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23
sys/dev/aac/aac.c
View File

@ -661,6 +661,16 @@ aac_detach(device_t dev)
callout_drain(&sc->aac_daemontime);
mtx_lock(&sc->aac_io_lock);
while (sc->aifflags & AAC_AIFFLAGS_RUNNING) {
sc->aifflags |= AAC_AIFFLAGS_EXIT;
wakeup(sc->aifthread);
msleep(sc->aac_dev, &sc->aac_io_lock, PUSER, "aacdch", 0);
}
mtx_unlock(&sc->aac_io_lock);
KASSERT((sc->aifflags & AAC_AIFFLAGS_RUNNING) == 0,
("%s: invalid detach state", __func__));
/* Remove the child containers */
while ((co = TAILQ_FIRST(&sc->aac_container_tqh)) != NULL) {
error = device_delete_child(dev, co->co_disk);
@ -679,15 +689,6 @@ aac_detach(device_t dev)
free(sim, M_AACBUF);
}
if (sc->aifflags & AAC_AIFFLAGS_RUNNING) {
sc->aifflags |= AAC_AIFFLAGS_EXIT;
wakeup(sc->aifthread);
tsleep(sc->aac_dev, PUSER | PCATCH, "aacdch", 30 * hz);
}
if (sc->aifflags & AAC_AIFFLAGS_RUNNING)
panic("Cannot shutdown AIF thread");
if ((error = aac_shutdown(dev)))
return(error);
@ -1020,7 +1021,7 @@ aac_command_thread(struct aac_softc *sc)
/*
* First see if any FIBs need to be allocated. This needs
* to be called without the driver lock because contigmalloc
* will grab Giant, and would result in an LOR.
* can sleep.
*/
if ((sc->aifflags & AAC_AIFFLAGS_ALLOCFIBS) != 0) {
mtx_unlock(&sc->aac_io_lock);
@ -1372,7 +1373,9 @@ aac_alloc_command(struct aac_softc *sc, struct aac_command **cmp)
if ((cm = aac_dequeue_free(sc)) == NULL) {
if (sc->total_fibs < sc->aac_max_fibs) {
mtx_lock(&sc->aac_io_lock);
sc->aifflags |= AAC_AIFFLAGS_ALLOCFIBS;
mtx_unlock(&sc->aac_io_lock);
wakeup(sc->aifthread);
}
return (EBUSY);

7
sys/dev/aac/aacvar.h
View File

@ -386,13 +386,12 @@ struct aac_softc
struct proc *aifthread;
int aifflags;
#define AAC_AIFFLAGS_RUNNING (1 << 0)
#define AAC_AIFFLAGS_AIF (1 << 1)
#define AAC_AIFFLAGS_UNUSED0 (1 << 1)
#define AAC_AIFFLAGS_EXIT (1 << 2)
#define AAC_AIFFLAGS_EXITED (1 << 3)
#define AAC_AIFFLAGS_PRINTF (1 << 4)
#define AAC_AIFFLAGS_UNUSED1 (1 << 4)
#define AAC_AIFFLAGS_ALLOCFIBS (1 << 5)
#define AAC_AIFFLAGS_PENDING (AAC_AIFFLAGS_AIF | AAC_AIFFLAGS_PRINTF | \
AAC_AIFFLAGS_ALLOCFIBS)
#define AAC_AIFFLAGS_PENDING AAC_AIFFLAGS_ALLOCFIBS
u_int32_t flags;
#define AAC_FLAGS_PERC2QC (1 << 0)
#define AAC_FLAGS_ENABLE_CAM (1 << 1) /* No SCSI passthrough */