[libata] ensure ->tf_read() hook reads Status and Error registers
We want ->tf_read() to get a complete snapshot of all taskfile
registers, without requiring the callers to manually call
ata_chk_status() and ata_chk_err() themselves.
This also fixes a minor bug in sata_vsc where the lower bits of the
feature register were incorrectly placed in the HOB (high order bits)
portion of struct ata_taskfile.
diff --git a/drivers/scsi/sata_svw.c b/drivers/scsi/sata_svw.c
index e0f9570..46208f5 100644
--- a/drivers/scsi/sata_svw.c
+++ b/drivers/scsi/sata_svw.c
@@ -84,6 +84,8 @@
/* Port stride */
#define K2_SATA_PORT_OFFSET 0x100
+static u8 k2_stat_check_status(struct ata_port *ap);
+
static u32 k2_sata_scr_read (struct ata_port *ap, unsigned int sc_reg)
{
@@ -136,16 +138,24 @@
static void k2_sata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
{
struct ata_ioports *ioaddr = &ap->ioaddr;
- u16 nsect, lbal, lbam, lbah;
+ u16 nsect, lbal, lbam, lbah, feature;
- nsect = tf->nsect = readw(ioaddr->nsect_addr);
- lbal = tf->lbal = readw(ioaddr->lbal_addr);
- lbam = tf->lbam = readw(ioaddr->lbam_addr);
- lbah = tf->lbah = readw(ioaddr->lbah_addr);
+ tf->command = k2_stat_check_status(ap);
tf->device = readw(ioaddr->device_addr);
+ feature = readw(ioaddr->error_addr);
+ nsect = readw(ioaddr->nsect_addr);
+ lbal = readw(ioaddr->lbal_addr);
+ lbam = readw(ioaddr->lbam_addr);
+ lbah = readw(ioaddr->lbah_addr);
+
+ tf->feature = feature;
+ tf->nsect = nsect;
+ tf->lbal = lbal;
+ tf->lbam = lbam;
+ tf->lbah = lbah;
if (tf->flags & ATA_TFLAG_LBA48) {
- tf->hob_feature = readw(ioaddr->error_addr) >> 8;
+ tf->hob_feature = feature >> 8;
tf->hob_nsect = nsect >> 8;
tf->hob_lbal = lbal >> 8;
tf->hob_lbam = lbam >> 8;