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path: root/drivers/ata/pata_macio.c
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Diffstat (limited to 'drivers/ata/pata_macio.c')
-rw-r--r--drivers/ata/pata_macio.c30
1 files changed, 20 insertions, 10 deletions
diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index 1b85e8bf4ef9..f2f36e55a1f4 100644
--- a/drivers/ata/pata_macio.c
+++ b/drivers/ata/pata_macio.c
@@ -208,6 +208,19 @@ static const char* macio_ata_names[] = {
/* Don't let a DMA segment go all the way to 64K */
#define MAX_DBDMA_SEG 0xff00
+#ifdef CONFIG_PAGE_SIZE_64KB
+/*
+ * The SCSI core requires the segment size to cover at least a page, so
+ * for 64K page size kernels it must be at least 64K. However the
+ * hardware can't handle 64K, so pata_macio_qc_prep() will split large
+ * requests. To handle the split requests the tablesize must be halved.
+ */
+#define PATA_MACIO_MAX_SEGMENT_SIZE SZ_64K
+#define PATA_MACIO_SG_TABLESIZE (MAX_DCMDS / 2)
+#else
+#define PATA_MACIO_MAX_SEGMENT_SIZE MAX_DBDMA_SEG
+#define PATA_MACIO_SG_TABLESIZE MAX_DCMDS
+#endif
/*
* Wait 1s for disk to answer on IDE bus after a hard reset
@@ -541,7 +554,8 @@ static enum ata_completion_errors pata_macio_qc_prep(struct ata_queued_cmd *qc)
while (sg_len) {
/* table overflow should never happen */
- BUG_ON (pi++ >= MAX_DCMDS);
+ if (WARN_ON_ONCE(pi >= MAX_DCMDS))
+ return AC_ERR_SYSTEM;
len = (sg_len < MAX_DBDMA_SEG) ? sg_len : MAX_DBDMA_SEG;
table->command = cpu_to_le16(write ? OUTPUT_MORE: INPUT_MORE);
@@ -553,11 +567,13 @@ static enum ata_completion_errors pata_macio_qc_prep(struct ata_queued_cmd *qc)
addr += len;
sg_len -= len;
++table;
+ ++pi;
}
}
/* Should never happen according to Tejun */
- BUG_ON(!pi);
+ if (WARN_ON_ONCE(!pi))
+ return AC_ERR_SYSTEM;
/* Convert the last command to an input/output */
table--;
@@ -912,16 +928,10 @@ static int pata_macio_do_resume(struct pata_macio_priv *priv)
static const struct scsi_host_template pata_macio_sht = {
__ATA_BASE_SHT(DRV_NAME),
- .sg_tablesize = MAX_DCMDS,
+ .sg_tablesize = PATA_MACIO_SG_TABLESIZE,
/* We may not need that strict one */
.dma_boundary = ATA_DMA_BOUNDARY,
- /*
- * The SCSI core requires the segment size to cover at least a page, so
- * for 64K page size kernels this must be at least 64K. However the
- * hardware can't handle 64K, so pata_macio_qc_prep() will split large
- * requests.
- */
- .max_segment_size = SZ_64K,
+ .max_segment_size = PATA_MACIO_MAX_SEGMENT_SIZE,
.device_configure = pata_macio_device_configure,
.sdev_groups = ata_common_sdev_groups,
.can_queue = ATA_DEF_QUEUE,