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[SCSI] buslogic: Added check for DMA mapping errors

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Added check for DMA mapping errors for request sense data
buffer. Checking for mapping error can avoid potential wild
writes. This patch was prompted by the warning from
dma_unmap when kernel is compiled with CONFIG_DMA_API_DEBUG.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Tested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Khalid Aziz 2013-09-13 13:44:06 -06:00 committed by James Bottomley
parent 5ae3034430
commit eeceec9040
1 changed files with 23 additions and 13 deletions
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30
drivers/scsi/BusLogic.c
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@ -26,8 +26,8 @@
*/
#define blogic_drvr_version "2.1.16"
#define blogic_drvr_date "18 July 2002"
#define blogic_drvr_version "2.1.17"
#define blogic_drvr_date "12 September 2013"
#include <linux/module.h>
#include <linux/init.h>
@ -311,11 +311,13 @@ static struct blogic_ccb *blogic_alloc_ccb(struct blogic_adapter *adapter)
caller.
*/
static void blogic_dealloc_ccb(struct blogic_ccb *ccb)
static void blogic_dealloc_ccb(struct blogic_ccb *ccb, int dma_unmap)
{
struct blogic_adapter *adapter = ccb->adapter;
if (ccb->command != NULL)
scsi_dma_unmap(ccb->command);
if (dma_unmap)
pci_unmap_single(adapter->pci_device, ccb->sensedata,
ccb->sense_datalen, PCI_DMA_FROMDEVICE);
@ -2762,7 +2764,7 @@ static void blogic_process_ccbs(struct blogic_adapter *adapter)
/*
Place CCB back on the Host Adapter's free list.
*/
blogic_dealloc_ccb(ccb);
blogic_dealloc_ccb(ccb, 1);
#if 0 /* this needs to be redone different for new EH */
/*
Bus Device Reset CCBs have the command field
@ -2791,7 +2793,7 @@ static void blogic_process_ccbs(struct blogic_adapter *adapter)
if (ccb->status == BLOGIC_CCB_RESET &&
ccb->tgt_id == tgt_id) {
command = ccb->command;
blogic_dealloc_ccb(ccb);
blogic_dealloc_ccb(ccb, 1);
adapter->active_cmds[tgt_id]--;
command->result = DID_RESET << 16;
command->scsi_done(command);
@ -2862,7 +2864,7 @@ static void blogic_process_ccbs(struct blogic_adapter *adapter)
/*
Place CCB back on the Host Adapter's free list.
*/
blogic_dealloc_ccb(ccb);
blogic_dealloc_ccb(ccb, 1);
/*
Call the SCSI Command Completion Routine.
*/
@ -3034,6 +3036,7 @@ static int blogic_qcmd_lck(struct scsi_cmnd *command,
int buflen = scsi_bufflen(command);
int count;
struct blogic_ccb *ccb;
dma_addr_t sense_buf;
/*
SCSI REQUEST_SENSE commands will be executed automatically by the
@ -3179,10 +3182,17 @@ static int blogic_qcmd_lck(struct scsi_cmnd *command,
}
memcpy(ccb->cdb, cdb, cdblen);
ccb->sense_datalen = SCSI_SENSE_BUFFERSIZE;
ccb->sensedata = pci_map_single(adapter->pci_device,
ccb->command = command;
sense_buf = pci_map_single(adapter->pci_device,
command->sense_buffer, ccb->sense_datalen,
PCI_DMA_FROMDEVICE);
ccb->command = command;
if (dma_mapping_error(&adapter->pci_device->dev, sense_buf)) {
blogic_err("DMA mapping for sense data buffer failed\n",
adapter);
blogic_dealloc_ccb(ccb, 0);
return SCSI_MLQUEUE_HOST_BUSY;
}
ccb->sensedata = sense_buf;
command->scsi_done = comp_cb;
if (blogic_multimaster_type(adapter)) {
/*
@ -3203,7 +3213,7 @@ static int blogic_qcmd_lck(struct scsi_cmnd *command,
if (!blogic_write_outbox(adapter, BLOGIC_MBOX_START,
ccb)) {
blogic_warn("Still unable to write Outgoing Mailbox - " "Host Adapter Dead?\n", adapter);
blogic_dealloc_ccb(ccb);
blogic_dealloc_ccb(ccb, 1);
command->result = DID_ERROR << 16;
command->scsi_done(command);
}
@ -3337,7 +3347,7 @@ static int blogic_resetadapter(struct blogic_adapter *adapter, bool hard_reset)
for (ccb = adapter->all_ccbs; ccb != NULL; ccb = ccb->next_all)
if (ccb->status == BLOGIC_CCB_ACTIVE)
blogic_dealloc_ccb(ccb);
blogic_dealloc_ccb(ccb, 1);
/*
* Wait a few seconds between the Host Adapter Hard Reset which
* initiates a SCSI Bus Reset and issuing any SCSI Commands. Some