The data transfer mode that corresponds to the 'xfer_mode' parameter for
ata_xfer_mode2shift() is a 8-bit *unsigned* value. Using *unsigned long*
to declare the parameter leads to a problematic implicit *int* to *unsigned
long* cast and was most probably a result of a copy/paste mistake -- use
the 'u8' type instead, as in ata_xfer_mode2mask()...
Found by Linux Verification Center (linuxtesting.org) with the SVACE static
analysis tool.
Signed-off-by: Sergey Shtylyov <s.shtylyov@xxxxxx>
---
This patch is against the 'for-next' branch of Damien Le Moal's 'libata.git'
repo.
drivers/ata/libata-core.c | 2 +-
include/linux/libata.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
Index: libata/drivers/ata/libata-core.c
===================================================================
--- libata.orig/drivers/ata/libata-core.c
+++ libata/drivers/ata/libata-core.c
@@ -898,7 +898,7 @@ EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
* RETURNS:
* Matching xfer_shift, -1 if no match found.
*/
-int ata_xfer_mode2shift(unsigned long xfer_mode)
+int ata_xfer_mode2shift(u8 xfer_mode)
{
const struct ata_xfer_ent *ent;
Index: libata/include/linux/libata.h
===================================================================
--- libata.orig/include/linux/libata.h
+++ libata/include/linux/libata.h
@@ -1111,7 +1111,7 @@ extern void ata_unpack_xfermask(unsigned
unsigned long *udma_mask);
extern u8 ata_xfer_mask2mode(unsigned long xfer_mask);
extern unsigned long ata_xfer_mode2mask(u8 xfer_mode);
-extern int ata_xfer_mode2shift(unsigned long xfer_mode);
+extern int ata_xfer_mode2shift(u8 xfer_mode);
extern const char *ata_mode_string(unsigned long xfer_mask);
extern unsigned long ata_id_xfermask(const u16 *id);
extern int ata_std_qc_defer(struct ata_queued_cmd *qc);
