The overflow/underflow conditions in pata_macio_qc_prep() should never
happen. But if they do there's no need to kill the system entirely, a
WARN and failing the IO request should be sufficient and might allow the
system to keep running.
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
---
drivers/ata/pata_macio.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
v2: Use AC_ERR_SYSTEM as suggested by Damien.
diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index 1cb8d24b088f..f2f36e55a1f4 100644
--- a/drivers/ata/pata_macio.c
+++ b/drivers/ata/pata_macio.c
@@ -554,7 +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);
@@ -566,11 +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--;
--
2.46.0
