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3w-xxxx: fix command completion race

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The 3w-xxxx driver needs to tear down the dma mappings before returning
the command to the midlayer, as there is no guarantee the sglist and
count are valid after that point.  Also remove the dma mapping helpers
which have another inherent race due to the request_id index.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Acked-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Christoph Hellwig 2015-04-23 09:48:50 +02:00 committed by James Bottomley
parent 579d69bc1f
commit 9cd9554615
2 changed files with 6 additions and 41 deletions
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42
drivers/scsi/3w-xxxx.c
View File

@ -1271,32 +1271,6 @@ static int tw_initialize_device_extension(TW_Device_Extension *tw_dev)
return 0; return 0;
} /* End tw_initialize_device_extension() */ } /* End tw_initialize_device_extension() */
static int tw_map_scsi_sg_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
{
int use_sg;
dprintk(KERN_WARNING "3w-xxxx: tw_map_scsi_sg_data()\n");
use_sg = scsi_dma_map(cmd);
if (use_sg < 0) {
printk(KERN_WARNING "3w-xxxx: tw_map_scsi_sg_data(): pci_map_sg() failed.\n");
return 0;
}
cmd->SCp.phase = TW_PHASE_SGLIST;
cmd->SCp.have_data_in = use_sg;
return use_sg;
} /* End tw_map_scsi_sg_data() */
static void tw_unmap_scsi_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
{
dprintk(KERN_WARNING "3w-xxxx: tw_unmap_scsi_data()\n");
if (cmd->SCp.phase == TW_PHASE_SGLIST)
scsi_dma_unmap(cmd);
} /* End tw_unmap_scsi_data() */
/* This function will reset a device extension */ /* This function will reset a device extension */
static int tw_reset_device_extension(TW_Device_Extension *tw_dev) static int tw_reset_device_extension(TW_Device_Extension *tw_dev)
{ {
@ -1319,8 +1293,8 @@ static int tw_reset_device_extension(TW_Device_Extension *tw_dev)
srb = tw_dev->srb[i]; srb = tw_dev->srb[i];
if (srb != NULL) { if (srb != NULL) {
srb->result = (DID_RESET << 16); srb->result = (DID_RESET << 16);
tw_dev->srb[i]->scsi_done(tw_dev->srb[i]); scsi_dma_unmap(srb);
tw_unmap_scsi_data(tw_dev->tw_pci_dev, tw_dev->srb[i]); srb->scsi_done(srb);
} }
} }
} }
@ -1767,8 +1741,8 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
command_packet->byte8.io.lba = lba; command_packet->byte8.io.lba = lba;
command_packet->byte6.block_count = num_sectors; command_packet->byte6.block_count = num_sectors;
use_sg = tw_map_scsi_sg_data(tw_dev->tw_pci_dev, tw_dev->srb[request_id]); use_sg = scsi_dma_map(srb);
if (!use_sg) if (use_sg <= 0)
return 1; return 1;
scsi_for_each_sg(tw_dev->srb[request_id], sg, use_sg, i) { scsi_for_each_sg(tw_dev->srb[request_id], sg, use_sg, i) {
@ -1955,9 +1929,6 @@ static int tw_scsi_queue_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_c
/* Save the scsi command for use by the ISR */ /* Save the scsi command for use by the ISR */
tw_dev->srb[request_id] = SCpnt; tw_dev->srb[request_id] = SCpnt;
/* Initialize phase to zero */
SCpnt->SCp.phase = TW_PHASE_INITIAL;
switch (*command) { switch (*command) {
case READ_10: case READ_10:
case READ_6: case READ_6:
@ -2185,12 +2156,11 @@ static irqreturn_t tw_interrupt(int irq, void *dev_instance)
/* Now complete the io */ /* Now complete the io */
if ((error != TW_ISR_DONT_COMPLETE)) { if ((error != TW_ISR_DONT_COMPLETE)) {
scsi_dma_unmap(tw_dev->srb[request_id]);
tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
tw_dev->state[request_id] = TW_S_COMPLETED; tw_dev->state[request_id] = TW_S_COMPLETED;
tw_state_request_finish(tw_dev, request_id); tw_state_request_finish(tw_dev, request_id);
tw_dev->posted_request_count--; tw_dev->posted_request_count--;
tw_dev->srb[request_id]->scsi_done(tw_dev->srb[request_id]);
tw_unmap_scsi_data(tw_dev->tw_pci_dev, tw_dev->srb[request_id]);
} }
} }

5
drivers/scsi/3w-xxxx.h
View File

@ -195,11 +195,6 @@ static unsigned char tw_sense_table[][4] =
#define TW_AEN_SMART_FAIL 0x000F #define TW_AEN_SMART_FAIL 0x000F
#define TW_AEN_SBUF_FAIL 0x0024 #define TW_AEN_SBUF_FAIL 0x0024
/* Phase defines */
#define TW_PHASE_INITIAL 0
#define TW_PHASE_SINGLE 1
#define TW_PHASE_SGLIST 2
/* Misc defines */ /* Misc defines */
#define TW_ALIGNMENT_6000 64 /* 64 bytes */ #define TW_ALIGNMENT_6000 64 /* 64 bytes */
#define TW_ALIGNMENT_7000 4 /* 4 bytes */ #define TW_ALIGNMENT_7000 4 /* 4 bytes */