[SCSI] aacraid: Fix blocking issue with container probing function (cast update)
Received from Mark Salyzyn,
The aac_probe_container call blocks. This is an issue because it is called on
occasion in the context of the queuecommand handler. Once in a blue moon this
has resulted in a kernel panic sleeping during interrupt; or problems with some
embedded system versions of the kernel that depend on queuecommand to not
block. This ugly patch rewrites the aac_probe_container call into a new routine
_aac_probe_container that is an asynchronous state machine to complete the
series of operations. The legacy blocking aac_probe_container call used in
other areas of the driver (during initialization scanning for all targets and
in the separate hot-add/remove [aacraid] thread) merely issues
_aac_probe_container and then simple spins calling schedule() waiting for
completion.
Signed-off-by: Mark Haverkamp <markh@linux-foundation.org>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index d789e61..1610f06 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -258,13 +258,10 @@
u32 index;
int status = 0;
struct fib * fibptr;
- unsigned instance;
struct aac_get_container_count *dinfo;
struct aac_get_container_count_resp *dresp;
int maximum_num_containers = MAXIMUM_NUM_CONTAINERS;
- instance = dev->scsi_host_ptr->unique_id;
-
if (!(fibptr = aac_fib_alloc(dev)))
return -ENOMEM;
@@ -284,88 +281,35 @@
maximum_num_containers = le32_to_cpu(dresp->ContainerSwitchEntries);
aac_fib_complete(fibptr);
}
+ aac_fib_free(fibptr);
if (maximum_num_containers < MAXIMUM_NUM_CONTAINERS)
maximum_num_containers = MAXIMUM_NUM_CONTAINERS;
- fsa_dev_ptr = kmalloc(
- sizeof(*fsa_dev_ptr) * maximum_num_containers, GFP_KERNEL);
- if (!fsa_dev_ptr) {
- aac_fib_free(fibptr);
+ fsa_dev_ptr = kmalloc(sizeof(*fsa_dev_ptr) * maximum_num_containers,
+ GFP_KERNEL);
+ if (!fsa_dev_ptr)
return -ENOMEM;
- }
memset(fsa_dev_ptr, 0, sizeof(*fsa_dev_ptr) * maximum_num_containers);
dev->fsa_dev = fsa_dev_ptr;
dev->maximum_num_containers = maximum_num_containers;
- for (index = 0; index < dev->maximum_num_containers; index++) {
- struct aac_query_mount *dinfo;
- struct aac_mount *dresp;
-
+ for (index = 0; index < dev->maximum_num_containers; ) {
fsa_dev_ptr[index].devname[0] = '\0';
- aac_fib_init(fibptr);
- dinfo = (struct aac_query_mount *) fib_data(fibptr);
+ status = aac_probe_container(dev, index);
- dinfo->command = cpu_to_le32(VM_NameServe);
- dinfo->count = cpu_to_le32(index);
- dinfo->type = cpu_to_le32(FT_FILESYS);
-
- status = aac_fib_send(ContainerCommand,
- fibptr,
- sizeof (struct aac_query_mount),
- FsaNormal,
- 1, 1,
- NULL, NULL);
- if (status < 0 ) {
+ if (status < 0) {
printk(KERN_WARNING "aac_get_containers: SendFIB failed.\n");
break;
}
- dresp = (struct aac_mount *)fib_data(fibptr);
- if ((le32_to_cpu(dresp->status) == ST_OK) &&
- (le32_to_cpu(dresp->mnt[0].vol) == CT_NONE)) {
- dinfo->command = cpu_to_le32(VM_NameServe64);
- dinfo->count = cpu_to_le32(index);
- dinfo->type = cpu_to_le32(FT_FILESYS);
-
- if (aac_fib_send(ContainerCommand,
- fibptr,
- sizeof(struct aac_query_mount),
- FsaNormal,
- 1, 1,
- NULL, NULL) < 0)
- continue;
- } else
- dresp->mnt[0].capacityhigh = 0;
-
- dprintk ((KERN_DEBUG
- "VM_NameServe cid=%d status=%d vol=%d state=%d cap=%llu\n",
- (int)index, (int)le32_to_cpu(dresp->status),
- (int)le32_to_cpu(dresp->mnt[0].vol),
- (int)le32_to_cpu(dresp->mnt[0].state),
- ((u64)le32_to_cpu(dresp->mnt[0].capacity)) +
- (((u64)le32_to_cpu(dresp->mnt[0].capacityhigh)) << 32)));
- if ((le32_to_cpu(dresp->status) == ST_OK) &&
- (le32_to_cpu(dresp->mnt[0].vol) != CT_NONE) &&
- (le32_to_cpu(dresp->mnt[0].state) != FSCS_HIDDEN)) {
- fsa_dev_ptr[index].valid = 1;
- fsa_dev_ptr[index].type = le32_to_cpu(dresp->mnt[0].vol);
- fsa_dev_ptr[index].size
- = ((u64)le32_to_cpu(dresp->mnt[0].capacity)) +
- (((u64)le32_to_cpu(dresp->mnt[0].capacityhigh)) << 32);
- if (le32_to_cpu(dresp->mnt[0].state) & FSCS_READONLY)
- fsa_dev_ptr[index].ro = 1;
- }
- aac_fib_complete(fibptr);
/*
* If there are no more containers, then stop asking.
*/
- if ((index + 1) >= le32_to_cpu(dresp->count)){
+ if (++index >= status)
break;
- }
}
- aac_fib_free(fibptr);
return status;
}
@@ -473,6 +417,146 @@
return -1;
}
+static int aac_probe_container_callback2(struct scsi_cmnd * scsicmd)
+{
+ struct fsa_dev_info *fsa_dev_ptr = ((struct aac_dev *)(scsicmd->device->host->hostdata))->fsa_dev;
+
+ if (fsa_dev_ptr[scmd_id(scsicmd)].valid)
+ return aac_scsi_cmd(scsicmd);
+
+ scsicmd->result = DID_NO_CONNECT << 16;
+ scsicmd->scsi_done(scsicmd);
+ return 0;
+}
+
+static int _aac_probe_container2(void * context, struct fib * fibptr)
+{
+ struct scsi_cmnd * scsicmd = (struct scsi_cmnd *)context;
+ struct fsa_dev_info *fsa_dev_ptr = ((struct aac_dev *)(scsicmd->device->host->hostdata))->fsa_dev;
+ int (*callback)(struct scsi_cmnd *);
+
+ scsicmd->SCp.Status = 0;
+ if (fsa_dev_ptr) {
+ struct aac_mount * dresp = (struct aac_mount *) fib_data(fibptr);
+ fsa_dev_ptr += scmd_id(scsicmd);
+
+ if ((le32_to_cpu(dresp->status) == ST_OK) &&
+ (le32_to_cpu(dresp->mnt[0].vol) != CT_NONE) &&
+ (le32_to_cpu(dresp->mnt[0].state) != FSCS_HIDDEN)) {
+ fsa_dev_ptr->valid = 1;
+ fsa_dev_ptr->type = le32_to_cpu(dresp->mnt[0].vol);
+ fsa_dev_ptr->size
+ = ((u64)le32_to_cpu(dresp->mnt[0].capacity)) +
+ (((u64)le32_to_cpu(dresp->mnt[0].capacityhigh)) << 32);
+ fsa_dev_ptr->ro = ((le32_to_cpu(dresp->mnt[0].state) & FSCS_READONLY) != 0);
+ }
+ if ((fsa_dev_ptr->valid & 1) == 0)
+ fsa_dev_ptr->valid = 0;
+ scsicmd->SCp.Status = le32_to_cpu(dresp->count);
+ }
+ aac_fib_complete(fibptr);
+ aac_fib_free(fibptr);
+ callback = (int (*)(struct scsi_cmnd *))(scsicmd->SCp.ptr);
+ scsicmd->SCp.ptr = NULL;
+ return (*callback)(scsicmd);
+}
+
+static int _aac_probe_container1(void * context, struct fib * fibptr)
+{
+ struct scsi_cmnd * scsicmd;
+ struct aac_mount * dresp;
+ struct aac_query_mount *dinfo;
+ int status;
+
+ dresp = (struct aac_mount *) fib_data(fibptr);
+ dresp->mnt[0].capacityhigh = 0;
+ if ((le32_to_cpu(dresp->status) != ST_OK) ||
+ ((le32_to_cpu(dresp->mnt[0].vol) != CT_NONE) &&
+ (le32_to_cpu(dresp->mnt[0].state) == FSCS_HIDDEN)))
+ return _aac_probe_container2(context, fibptr);
+ scsicmd = (struct scsi_cmnd *) context;
+ scsicmd->SCp.phase = AAC_OWNER_MIDLEVEL;
+
+ aac_fib_init(fibptr);
+
+ dinfo = (struct aac_query_mount *)fib_data(fibptr);
+
+ dinfo->command = cpu_to_le32(VM_NameServe64);
+ dinfo->count = cpu_to_le32(scmd_id(scsicmd));
+ dinfo->type = cpu_to_le32(FT_FILESYS);
+
+ status = aac_fib_send(ContainerCommand,
+ fibptr,
+ sizeof(struct aac_query_mount),
+ FsaNormal,
+ 0, 1,
+ (fib_callback) _aac_probe_container2,
+ (void *) scsicmd);
+ /*
+ * Check that the command queued to the controller
+ */
+ if (status == -EINPROGRESS) {
+ scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+ return 0;
+ }
+ if (status < 0) {
+ /* Inherit results from VM_NameServe, if any */
+ dresp->status = cpu_to_le32(ST_OK);
+ return _aac_probe_container2(context, fibptr);
+ }
+ return 0;
+}
+
+static int _aac_probe_container(struct scsi_cmnd * scsicmd, int (*callback)(struct scsi_cmnd *))
+{
+ struct fib * fibptr;
+ int status = -ENOMEM;
+
+ if ((fibptr = aac_fib_alloc((struct aac_dev *)scsicmd->device->host->hostdata))) {
+ struct aac_query_mount *dinfo;
+
+ aac_fib_init(fibptr);
+
+ dinfo = (struct aac_query_mount *)fib_data(fibptr);
+
+ dinfo->command = cpu_to_le32(VM_NameServe);
+ dinfo->count = cpu_to_le32(scmd_id(scsicmd));
+ dinfo->type = cpu_to_le32(FT_FILESYS);
+ scsicmd->SCp.ptr = (char *)callback;
+
+ status = aac_fib_send(ContainerCommand,
+ fibptr,
+ sizeof(struct aac_query_mount),
+ FsaNormal,
+ 0, 1,
+ (fib_callback) _aac_probe_container1,
+ (void *) scsicmd);
+ /*
+ * Check that the command queued to the controller
+ */
+ if (status == -EINPROGRESS) {
+ scsicmd->SCp.phase = AAC_OWNER_FIRMWARE;
+ return 0;
+ }
+ if (status < 0) {
+ scsicmd->SCp.ptr = NULL;
+ aac_fib_complete(fibptr);
+ aac_fib_free(fibptr);
+ }
+ }
+ if (status < 0) {
+ struct fsa_dev_info *fsa_dev_ptr = ((struct aac_dev *)(scsicmd->device->host->hostdata))->fsa_dev;
+ if (fsa_dev_ptr) {
+ fsa_dev_ptr += scmd_id(scsicmd);
+ if ((fsa_dev_ptr->valid & 1) == 0) {
+ fsa_dev_ptr->valid = 0;
+ return (*callback)(scsicmd);
+ }
+ }
+ }
+ return status;
+}
+
/**
* aac_probe_container - query a logical volume
* @dev: device to query
@@ -481,77 +565,37 @@
* Queries the controller about the given volume. The volume information
* is updated in the struct fsa_dev_info structure rather than returned.
*/
-
+static int aac_probe_container_callback1(struct scsi_cmnd * scsicmd)
+{
+ scsicmd->device = NULL;
+ return 0;
+}
+
int aac_probe_container(struct aac_dev *dev, int cid)
{
- struct fsa_dev_info *fsa_dev_ptr;
+ struct scsi_cmnd *scsicmd = kmalloc(sizeof(*scsicmd), GFP_KERNEL);
+ struct scsi_device *scsidev = kmalloc(sizeof(*scsidev), GFP_KERNEL);
int status;
- struct aac_query_mount *dinfo;
- struct aac_mount *dresp;
- struct fib * fibptr;
- unsigned instance;
- fsa_dev_ptr = dev->fsa_dev;
- if (!fsa_dev_ptr)
+ if (!scsicmd || !scsidev) {
+ kfree(scsicmd);
+ kfree(scsidev);
return -ENOMEM;
- instance = dev->scsi_host_ptr->unique_id;
-
- if (!(fibptr = aac_fib_alloc(dev)))
- return -ENOMEM;
-
- aac_fib_init(fibptr);
-
- dinfo = (struct aac_query_mount *)fib_data(fibptr);
-
- dinfo->command = cpu_to_le32(VM_NameServe);
- dinfo->count = cpu_to_le32(cid);
- dinfo->type = cpu_to_le32(FT_FILESYS);
-
- status = aac_fib_send(ContainerCommand,
- fibptr,
- sizeof(struct aac_query_mount),
- FsaNormal,
- 1, 1,
- NULL, NULL);
- if (status < 0) {
- printk(KERN_WARNING "aacraid: aac_probe_container query failed.\n");
- goto error;
}
+ scsicmd->list.next = NULL;
+ scsicmd->scsi_done = (void (*)(struct scsi_cmnd*))_aac_probe_container1;
- dresp = (struct aac_mount *) fib_data(fibptr);
+ scsicmd->device = scsidev;
+ scsidev->sdev_state = 0;
+ scsidev->id = cid;
+ scsidev->host = dev->scsi_host_ptr;
- if ((le32_to_cpu(dresp->status) == ST_OK) &&
- (le32_to_cpu(dresp->mnt[0].vol) == CT_NONE)) {
- dinfo->command = cpu_to_le32(VM_NameServe64);
- dinfo->count = cpu_to_le32(cid);
- dinfo->type = cpu_to_le32(FT_FILESYS);
-
- if (aac_fib_send(ContainerCommand,
- fibptr,
- sizeof(struct aac_query_mount),
- FsaNormal,
- 1, 1,
- NULL, NULL) < 0)
- goto error;
- } else
- dresp->mnt[0].capacityhigh = 0;
-
- if ((le32_to_cpu(dresp->status) == ST_OK) &&
- (le32_to_cpu(dresp->mnt[0].vol) != CT_NONE) &&
- (le32_to_cpu(dresp->mnt[0].state) != FSCS_HIDDEN)) {
- fsa_dev_ptr[cid].valid = 1;
- fsa_dev_ptr[cid].type = le32_to_cpu(dresp->mnt[0].vol);
- fsa_dev_ptr[cid].size
- = ((u64)le32_to_cpu(dresp->mnt[0].capacity)) +
- (((u64)le32_to_cpu(dresp->mnt[0].capacityhigh)) << 32);
- if (le32_to_cpu(dresp->mnt[0].state) & FSCS_READONLY)
- fsa_dev_ptr[cid].ro = 1;
- }
-
-error:
- aac_fib_complete(fibptr);
- aac_fib_free(fibptr);
-
+ if (_aac_probe_container(scsicmd, aac_probe_container_callback1) == 0)
+ while (scsicmd->device == scsidev)
+ schedule();
+ status = scsicmd->SCp.Status;
+ kfree(scsicmd);
+ kfree(scsidev);
return status;
}
@@ -1646,29 +1690,12 @@
case TEST_UNIT_READY:
if (dev->in_reset)
return -1;
- spin_unlock_irq(host->host_lock);
- aac_probe_container(dev, cid);
- if ((fsa_dev_ptr[cid].valid & 1) == 0)
- fsa_dev_ptr[cid].valid = 0;
- spin_lock_irq(host->host_lock);
- if (fsa_dev_ptr[cid].valid == 0) {
- scsicmd->result = DID_NO_CONNECT << 16;
- scsicmd->scsi_done(scsicmd);
- return 0;
- }
+ return _aac_probe_container(scsicmd,
+ aac_probe_container_callback2);
default:
break;
}
}
- /*
- * If the target container still doesn't exist,
- * return failure
- */
- if (fsa_dev_ptr[cid].valid == 0) {
- scsicmd->result = DID_BAD_TARGET << 16;
- scsicmd->scsi_done(scsicmd);
- return 0;
- }
} else { /* check for physical non-dasd devices */
if ((dev->nondasd_support == 1) || expose_physicals) {
if (dev->in_reset)