[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: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 94ff29f..7899e3d 100644 (file)
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -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);
 }