From: Tom Yan <tom.ty89@xxxxxxxxx>
ata_mselect_*() would initialize a char array for storing a copy of
the current mode page. However, char could be signed char. In that
case, bytes larger than 127 would be converted to negative number.
For example, 0xff from def_control_mpage[] would become -1. This
prevented ata_mselect_control() from working at all, since when it
did the read-only bits check, there would always be a mismatch.
Signed-off-by: Tom Yan <tom.ty89@xxxxxxxxx>
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 4a4e6f1..5cfcb4b 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3610,7 +3610,7 @@ static int ata_mselect_caching(struct ata_queued_cmd *qc,
{
struct ata_taskfile *tf = &qc->tf;
struct ata_device *dev = qc->dev;
- char mpage[CACHE_MPAGE_LEN];
+ u8 mpage[CACHE_MPAGE_LEN];
u8 wce, mask;
int i;
@@ -3668,7 +3668,7 @@ static int ata_mselect_control(struct ata_queued_cmd *qc,
const u8 *buf, int len, u16 *fp)
{
struct ata_device *dev = qc->dev;
- char mpage[CONTROL_MPAGE_LEN];
+ u8 mpage[CONTROL_MPAGE_LEN];
u8 d_sense, mask;
int i;
--
2.9.0
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