diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2008-07-15 23:19:55 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-15 23:30:56 +0200 |
| commit | 3a628b0fd42f7eaf9d052447784d48ceae9ffb8e (patch) | |
| tree | 44ffc68125d966d58f7cf8a1905dc9b7143e57a8 /drivers/scsi/a100u2w.c | |
| parent | BUG_ON on kernel misbehavior on A100U2W driver (diff) | |
| download | linux-3a628b0fd42f7eaf9d052447784d48ceae9ffb8e.tar.xz linux-3a628b0fd42f7eaf9d052447784d48ceae9ffb8e.zip | |
Don't crash on IOMMU overflow in A100U2W driver
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>
Diffstat (limited to 'drivers/scsi/a100u2w.c')
| -rw-r--r-- | drivers/scsi/a100u2w.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/scsi/a100u2w.c b/drivers/scsi/a100u2w.c index f5051f4301d7..84bb61628372 100644 --- a/drivers/scsi/a100u2w.c +++ b/drivers/scsi/a100u2w.c @@ -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; } |