[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.

5 files changed, 36 insertions, 14 deletions

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index f53d7b8ac33f..56c81f0aa1d9 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -370,6 +370,8 @@ static void ata_tf_read_pio(struct ata_port *ap, struct ata_taskfile *tf)
 {
         struct ata_ioports *ioaddr = &ap->ioaddr;
 
+        tf->command = ata_check_status(ap);
+        tf->feature = ata_chk_err(ap);
         tf->nsect = inb(ioaddr->nsect_addr);
         tf->lbal = inb(ioaddr->lbal_addr);
         tf->lbam = inb(ioaddr->lbam_addr);
@@ -402,6 +404,8 @@ static void ata_tf_read_mmio(struct ata_port *ap, struct ata_taskfile *tf)
 {
         struct ata_ioports *ioaddr = &ap->ioaddr;
 
+        tf->command = ata_check_status(ap);
+        tf->feature = ata_chk_err(ap);
         tf->nsect = readb((void __iomem *)ioaddr->nsect_addr);
         tf->lbal = readb((void __iomem *)ioaddr->lbal_addr);
         tf->lbam = readb((void __iomem *)ioaddr->lbam_addr);
diff --git a/drivers/scsi/pdc_adma.c b/drivers/scsi/pdc_adma.c
index 7999817915c3..af99feb9d237 100644
--- a/drivers/scsi/pdc_adma.c
+++ b/drivers/scsi/pdc_adma.c
@@ -490,7 +490,7 @@ static inline unsigned int adma_intr_mmio(struct ata_host_set *host_set)
                         if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
 
                                 /* check main status, clearing INTRQ */
-                                u8 status = ata_chk_status(ap);
+                                u8 status = ata_check_status(ap);
                                 if ((status & ATA_BUSY))
                                         continue;
                                 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
diff --git a/drivers/scsi/sata_qstor.c b/drivers/scsi/sata_qstor.c
index 250dafa6bc36..1aaf3304d397 100644
--- a/drivers/scsi/sata_qstor.c
+++ b/drivers/scsi/sata_qstor.c
@@ -433,7 +433,7 @@ static inline unsigned int qs_intr_mmio(struct ata_host_set *host_set)
                         if (qc && (!(qc->tf.ctl & ATA_NIEN))) {
 
                                 /* check main status, clearing INTRQ */
-                                u8 status = ata_chk_status(ap);
+                                u8 status = ata_check_status(ap);
                                 if ((status & ATA_BUSY))
                                         continue;
                                 DPRINTK("ata%u: protocol %d (dev_stat 0x%X)\n",
diff --git a/drivers/scsi/sata_svw.c b/drivers/scsi/sata_svw.c
index e0f9570bc6dd..46208f52d0e1 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_load(struct ata_port *ap, const struct ata_taskfile *tf)
 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;
diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c
index 5af05fdf8544..54273e0063c7 100644
--- a/drivers/scsi/sata_vsc.c
+++ b/drivers/scsi/sata_vsc.c
@@ -153,16 +153,24 @@ static void vsc_sata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
 static void vsc_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 = ata_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 = readb(ioaddr->error_addr);
+                tf->hob_feature = feature >> 8;
                 tf->hob_nsect = nsect >> 8;
                 tf->hob_lbal = lbal >> 8;
                 tf->hob_lbam = lbam >> 8;