Commit 93c20a59 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by James Bottomley
Browse files

[SCSI] scsi_transport_sas: fix the lifetime of sas bsg objects



scsi_transport_sas calls blk_cleanup_queue too early for bsg
queues. If a user holds a sas_host, end_device, or expander device
open, remove the device, then send a request to it, we get a kernel
crash. We need to call blk_cleanup_queue in the release callback as we
do with scsi devices.

This patch moves blk_cleanup_queue to sas_expander_release and
sas_end_device_release from sas_bsg_remove. sas_host can't use the
release callback in struct device so use bsg's release callback.
Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent 97f46ae4
......@@ -192,6 +192,16 @@ static void sas_non_host_smp_request(struct request_queue *q)
sas_smp_request(q, rphy_to_shost(rphy), rphy);
}
static void sas_host_release(struct device *dev)
{
struct Scsi_Host *shost = dev_to_shost(dev);
struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
struct request_queue *q = sas_host->q;
if (q)
blk_cleanup_queue(q);
}
static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
{
struct request_queue *q;
......@@ -199,6 +209,7 @@ static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
struct device *dev;
char namebuf[BUS_ID_SIZE];
const char *name;
void (*release)(struct device *);
if (!to_sas_internal(shost->transportt)->f->smp_handler) {
printk("%s can't handle SMP requests\n", shost->hostt->name);
......@@ -209,17 +220,19 @@ static int sas_bsg_initialize(struct Scsi_Host *shost, struct sas_rphy *rphy)
q = blk_init_queue(sas_non_host_smp_request, NULL);
dev = &rphy->dev;
name = dev->bus_id;
release = NULL;
} else {
q = blk_init_queue(sas_host_smp_request, NULL);
dev = &shost->shost_gendev;
snprintf(namebuf, sizeof(namebuf),
"sas_host%d", shost->host_no);
name = namebuf;
release = sas_host_release;
}
if (!q)
return -ENOMEM;
error = bsg_register_queue(q, dev, name, NULL);
error = bsg_register_queue(q, dev, name, release);
if (error) {
blk_cleanup_queue(q);
return -ENOMEM;
......@@ -253,7 +266,6 @@ static void sas_bsg_remove(struct Scsi_Host *shost, struct sas_rphy *rphy)
return;
bsg_unregister_queue(q);
blk_cleanup_queue(q);
}
/*
......@@ -1301,6 +1313,9 @@ static void sas_expander_release(struct device *dev)
struct sas_rphy *rphy = dev_to_rphy(dev);
struct sas_expander_device *edev = rphy_to_expander_device(rphy);
if (rphy->q)
blk_cleanup_queue(rphy->q);
put_device(dev->parent);
kfree(edev);
}
......@@ -1310,6 +1325,9 @@ static void sas_end_device_release(struct device *dev)
struct sas_rphy *rphy = dev_to_rphy(dev);
struct sas_end_device *edev = rphy_to_end_device(rphy);
if (rphy->q)
blk_cleanup_queue(rphy->q);
put_device(dev->parent);
kfree(edev);
}
......
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