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[SCSI] vmw_pvscsi: Fix pvscsi_abort() function.

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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@vmware.com>
Tested-by: Ewan Milne <emilne@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Arvind Kumar 2014-03-08 12:51:12 -08:00 committed by James Bottomley
parent 4909cc2b89
commit a2713cceb3
2 changed files with 50 additions and 7 deletions
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53
drivers/scsi/vmw_pvscsi.c
View File

@ -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;
}
pvscsi_abort_cmd(adapter, ctx);
/*
* Mark that the command has been requested to be aborted and issue
* the abort.
*/
ctx->abort_cmp = &abort_cmp;
pvscsi_process_completion_ring(adapter);
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);
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;
}
/*

4
drivers/scsi/vmw_pvscsi.h
View File

@ -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