This change ensures that pvscsi_abort() function returns SUCCESS
only when the command in question was actually completed, otherwise
returns FAILURE. The code before change, was causing a bug where
driver tries to complete a command to the mid-layer while the mid-layer
has already requested the driver to abort that command, in response
to which the driver has responded with SUCCESS causing mid-layer
to free the command struct.
Signed-off-by: Arvind Kumar <arvindkumar@xxxxxxxxxx>
Cc: Ewan Milne <emilne@xxxxxxxxxx>
---
drivers/scsi/vmw_pvscsi.c | 51 +++++++++++++++++++++++++++++++++++++++++----
drivers/scsi/vmw_pvscsi.h | 4 ++--
2 files changed, 49 insertions(+), 6 deletions(-)
diff --git a/drivers/scsi/vmw_pvscsi.c b/drivers/scsi/vmw_pvscsi.c
index b9755ec..7c5abd7 100644
--- a/drivers/scsi/vmw_pvscsi.c
+++ b/drivers/scsi/vmw_pvscsi.c
@@ -1,7 +1,7 @@
/*
* Linux driver for VMware's para-virtualized SCSI HBA.
*
- * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved.
+ * Copyright (C) 2008-2014, VMware, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -62,6 +62,7 @@ struct pvscsi_ctx {
dma_addr_t dataPA;
dma_addr_t sensePA;
dma_addr_t sglPA;
+ struct completion *abort_cmp;
};
struct pvscsi_adapter {
@@ -177,6 +178,7 @@ static void pvscsi_release_context(struct pvscsi_adapter *adapter,
struct pvscsi_ctx *ctx)
{
ctx->cmd = NULL;
+ ctx->abort_cmp = NULL;
list_add(&ctx->list, &adapter->cmd_pool);
}
@@ -496,15 +498,27 @@ static void pvscsi_complete_request(struct pvscsi_adapter *adapter,
{
struct pvscsi_ctx *ctx;
struct scsi_cmnd *cmd;
+ struct completion *abort_cmp;
u32 btstat = e->hostStatus;
u32 sdstat = e->scsiStatus;
ctx = pvscsi_get_context(adapter, e->context);
cmd = ctx->cmd;
+ abort_cmp = ctx->abort_cmp;
pvscsi_unmap_buffers(adapter, ctx);
pvscsi_release_context(adapter, ctx);
- cmd->result = 0;
+ if (abort_cmp) {
+ /*
+ * The command was requested to be aborted. Just signal that
+ * the request completed and swallow the actual cmd completion
+ * here. The abort handler will post a completion for this
+ * command indicating that it got successfully aborted.
+ */
+ complete(abort_cmp);
+ return;
+ }
+ cmd->result = 0;
if (sdstat != SAM_STAT_GOOD &&
(btstat == BTSTAT_SUCCESS ||
btstat == BTSTAT_LINKED_COMMAND_COMPLETED ||
@@ -726,6 +740,8 @@ static int pvscsi_abort(struct scsi_cmnd *cmd)
struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
struct pvscsi_ctx *ctx;
unsigned long flags;
+ int result = SUCCESS;
+ DECLARE_COMPLETION_ONSTACK(abort_cmp);
scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
adapter->host->host_no, cmd);
@@ -748,13 +764,40 @@ static int pvscsi_abort(struct scsi_cmnd *cmd)
goto out;
}
+ /*
+ * Mark that the command has been requested to be aborted and issue
+ * the abort.
+ */
+ ctx->abort_cmp = &abort_cmp;
+
pvscsi_abort_cmd(adapter, ctx);
+ spin_unlock_irqrestore(&adapter->hw_lock, flags);
+ /* Wait for 2 secs for the completion. */
+ wait_for_completion_timeout(&abort_cmp, msecs_to_jiffies(2000));
+ spin_lock_irqsave(&adapter->hw_lock, flags);
- pvscsi_process_completion_ring(adapter);
+ if (!completion_done(&abort_cmp)) {
+ /*
+ * Failed to abort the command, unmark the fact that it
+ * was requested to be aborted.
+ */
+ ctx->abort_cmp = NULL;
+ result = FAILED;
+ scmd_printk(KERN_DEBUG, cmd,
+ "Failed to get completion for aborted cmd %p\n",
+ cmd);
+ goto out;
+ }
+
+ /*
+ * Successfully aborted the command.
+ */
+ cmd->result = (DID_ABORT << 16);
+ cmd->scsi_done(cmd);
out:
spin_unlock_irqrestore(&adapter->hw_lock, flags);
- return SUCCESS;
+ return result;
}
/*
diff --git a/drivers/scsi/vmw_pvscsi.h b/drivers/scsi/vmw_pvscsi.h
index 3546e86..a643775 100644
--- a/drivers/scsi/vmw_pvscsi.h
+++ b/drivers/scsi/vmw_pvscsi.h
@@ -1,7 +1,7 @@
/*
* VMware PVSCSI header file
*
- * Copyright (C) 2008-2009, VMware, Inc. All Rights Reserved.
+ * Copyright (C) 2008-2014, VMware, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
@@ -26,7 +26,7 @@
#include <linux/types.h>
-#define PVSCSI_DRIVER_VERSION_STRING "1.0.2.0-k"
+#define PVSCSI_DRIVER_VERSION_STRING "1.0.3.0-k"
#define PVSCSI_MAX_NUM_SG_ENTRIES_PER_SEGMENT 128
--
1.7.9.5
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
