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Message-Id: <20160912152200.780083524@linuxfoundation.org>
Date: Mon, 12 Sep 2016 18:59:13 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
"Manoj N. Kumar" <manoj@...ux.vnet.ibm.com>,
"Matthew R. Ochs" <mrochs@...ux.vnet.ibm.com>,
Uma Krishnan <ukrishn@...ux.vnet.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.4 044/192] [PATCH 045/135] cxlflash: Resolve oops in wait_port_offline
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit b45cdbaf9f7f0486847c52f60747fb108724652a ]
If an async error interrupt is generated, and the error requires the FC
link to be reset, it cannot be performed in the interrupt context. So a
work element is scheduled to complete the link reset in a process
context. If either an EEH event or an escalation occurs in between when
the interrupt is generated and the scheduled work is started, the MMIO
space may no longer be available. This will cause an oops in the worker
thread.
[ 606.806583] NIP kthread_data+0x28/0x40
[ 606.806633] LR wq_worker_sleeping+0x30/0x100
[ 606.806694] Call Trace:
[ 606.806721] 0x50 (unreliable)
[ 606.806796] wq_worker_sleeping+0x30/0x100
[ 606.806884] __schedule+0x69c/0x8a0
[ 606.806959] schedule+0x44/0xc0
[ 606.807034] do_exit+0x770/0xb90
[ 606.807109] die+0x300/0x460
[ 606.807185] bad_page_fault+0xd8/0x150
[ 606.807259] handle_page_fault+0x2c/0x30
[ 606.807338] wait_port_offline.constprop.12+0x60/0x130 [cxlflash]
To prevent the problem space area from being unmapped, when there is
pending work, a mapcount (using the kref mechanism) is held. The
mapcount is released only when the work is completed. The last
reference release is tied to the unmapping service.
Signed-off-by: Manoj N. Kumar <manoj@...ux.vnet.ibm.com>
Acked-by: Matthew R. Ochs <mrochs@...ux.vnet.ibm.com>
Reviewed-by: Uma Krishnan <ukrishn@...ux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/scsi/cxlflash/common.h | 2 ++
drivers/scsi/cxlflash/main.c | 27 ++++++++++++++++++++++++---
2 files changed, 26 insertions(+), 3 deletions(-)
--- a/drivers/scsi/cxlflash/common.h
+++ b/drivers/scsi/cxlflash/common.h
@@ -165,6 +165,8 @@ struct afu {
struct sisl_host_map __iomem *host_map; /* MC host map */
struct sisl_ctrl_map __iomem *ctrl_map; /* MC control map */
+ struct kref mapcount;
+
ctx_hndl_t ctx_hndl; /* master's context handle */
u64 *hrrq_start;
u64 *hrrq_end;
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -368,6 +368,7 @@ out:
no_room:
afu->read_room = true;
+ kref_get(&cfg->afu->mapcount);
schedule_work(&cfg->work_q);
rc = SCSI_MLQUEUE_HOST_BUSY;
goto out;
@@ -473,6 +474,16 @@ out:
return rc;
}
+static void afu_unmap(struct kref *ref)
+{
+ struct afu *afu = container_of(ref, struct afu, mapcount);
+
+ if (likely(afu->afu_map)) {
+ cxl_psa_unmap((void __iomem *)afu->afu_map);
+ afu->afu_map = NULL;
+ }
+}
+
/**
* cxlflash_driver_info() - information handler for this host driver
* @host: SCSI host associated with device.
@@ -503,6 +514,7 @@ static int cxlflash_queuecommand(struct
ulong lock_flags;
short lflag = 0;
int rc = 0;
+ int kref_got = 0;
dev_dbg_ratelimited(dev, "%s: (scp=%p) %d/%d/%d/%llu "
"cdb=(%08X-%08X-%08X-%08X)\n",
@@ -547,6 +559,9 @@ static int cxlflash_queuecommand(struct
goto out;
}
+ kref_get(&cfg->afu->mapcount);
+ kref_got = 1;
+
cmd->rcb.ctx_id = afu->ctx_hndl;
cmd->rcb.port_sel = port_sel;
cmd->rcb.lun_id = lun_to_lunid(scp->device->lun);
@@ -587,6 +602,8 @@ static int cxlflash_queuecommand(struct
}
out:
+ if (kref_got)
+ kref_put(&afu->mapcount, afu_unmap);
pr_devel("%s: returning rc=%d\n", __func__, rc);
return rc;
}
@@ -661,6 +678,7 @@ static void stop_afu(struct cxlflash_cfg
cxl_psa_unmap((void __iomem *)afu->afu_map);
afu->afu_map = NULL;
}
+ kref_put(&afu->mapcount, afu_unmap);
}
}
@@ -746,8 +764,8 @@ static void cxlflash_remove(struct pci_d
scsi_remove_host(cfg->host);
/* fall through */
case INIT_STATE_AFU:
- term_afu(cfg);
cancel_work_sync(&cfg->work_q);
+ term_afu(cfg);
case INIT_STATE_PCI:
pci_release_regions(cfg->dev);
pci_disable_device(pdev);
@@ -1331,6 +1349,7 @@ static irqreturn_t cxlflash_async_err_ir
__func__, port);
cfg->lr_state = LINK_RESET_REQUIRED;
cfg->lr_port = port;
+ kref_get(&cfg->afu->mapcount);
schedule_work(&cfg->work_q);
}
@@ -1351,6 +1370,7 @@ static irqreturn_t cxlflash_async_err_ir
if (info->action & SCAN_HOST) {
atomic_inc(&cfg->scan_host_needed);
+ kref_get(&cfg->afu->mapcount);
schedule_work(&cfg->work_q);
}
}
@@ -1746,6 +1766,7 @@ static int init_afu(struct cxlflash_cfg
rc = -ENOMEM;
goto err1;
}
+ kref_init(&afu->mapcount);
/* No byte reverse on reading afu_version or string will be backwards */
reg = readq(&afu->afu_map->global.regs.afu_version);
@@ -1780,8 +1801,7 @@ out:
return rc;
err2:
- cxl_psa_unmap((void __iomem *)afu->afu_map);
- afu->afu_map = NULL;
+ kref_put(&afu->mapcount, afu_unmap);
err1:
term_mc(cfg, UNDO_START);
goto out;
@@ -2354,6 +2374,7 @@ static void cxlflash_worker_thread(struc
if (atomic_dec_if_positive(&cfg->scan_host_needed) >= 0)
scsi_scan_host(cfg->host);
+ kref_put(&afu->mapcount, afu_unmap);
}
/**
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