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Don't crash on IOMMU overflow in A100U2W driver

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Handle IOMMU overflow correctly, by retrying.  IOMMU errors can happen
and drivers must deal with them.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mikulas Patocka 2008-07-15 17:19:55 -04:00 committed by Linus Torvalds
parent a5db33411a
commit 3a628b0fd4
1 changed files with 8 additions and 3 deletions
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11
drivers/scsi/a100u2w.c
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@ -840,7 +840,7 @@ static irqreturn_t orc_interrupt(struct orc_host * host)
* Build a host adapter control block from the SCSI mid layer command
*/
static void inia100_build_scb(struct orc_host * host, struct orc_scb * scb, struct scsi_cmnd * cmd)
static int inia100_build_scb(struct orc_host * host, struct orc_scb * scb, struct scsi_cmnd * cmd)
{ /* Create corresponding SCB */
struct scatterlist *sg;
struct orc_sgent *sgent; /* Pointer to SG list */
@ -865,7 +865,8 @@ static void inia100_build_scb(struct orc_host * host, struct orc_scb * scb, stru
sgent = (struct orc_sgent *) & escb->sglist[0];
count_sg = scsi_dma_map(cmd);
BUG_ON(count_sg < 0);
if (count_sg < 0)
return count_sg;
BUG_ON(count_sg > TOTAL_SG_ENTRY);
/* Build the scatter gather lists */
@ -898,6 +899,7 @@ static void inia100_build_scb(struct orc_host * host, struct orc_scb * scb, stru
scb->tag_msg = 0; /* No tag support */
}
memcpy(scb->cdb, cmd->cmnd, scb->cdb_len);
return 0;
}
/**
@ -921,7 +923,10 @@ static int inia100_queue(struct scsi_cmnd * cmd, void (*done) (struct scsi_cmnd
if ((scb = orc_alloc_scb(host)) == NULL)
return SCSI_MLQUEUE_HOST_BUSY;
inia100_build_scb(host, scb, cmd);
if (inia100_build_scb(host, scb, cmd)) {
orc_release_scb(host, scb);
return SCSI_MLQUEUE_HOST_BUSY;
}
orc_exec_scb(host, scb); /* Start execute SCB */
return 0;
}