libata: clear dev->ering in smarter way

dev->ering used to be cleared together with the rest of ata_device in
ata_dev_init() which is called whenever a probing event occurs.
dev->ering is about to be used to track probing failures so it needs
to remain persistent over multiple porbing events.  This patch
achieves this by doing the following.

* Instead of CLEAR_OFFSET, define CLEAR_BEGIN and CLEAR_END and only
  clear between BEGIN and END.  ering is moved after END.  The split
  of persistent area is to allow hotter items remain at the head.

* ering is explicitly cleared on ata_dev_disable() and when device
  attach succeeds.  So, ering is persistent throug a device's life
  time (unless explicitly cleared of course) and also through periods
  inbetween disablement of an attached device and successful detection
  of the next one.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index d006e5c..564c03c 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5404,8 +5404,8 @@ void ata_dev_init(struct ata_device *dev)
        dev->horkage = 0;
        spin_unlock_irqrestore(ap->lock, flags);
 
-       memset((void *)dev + ATA_DEVICE_CLEAR_OFFSET, 0,
-              sizeof(*dev) - ATA_DEVICE_CLEAR_OFFSET);
+       memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
+              ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
        dev->pio_mask = UINT_MAX;
        dev->mwdma_mask = UINT_MAX;
        dev->udma_mask = UINT_MAX;

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index aafe82b..90092c1 100644 (file)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1194,6 +1194,11 @@ void ata_dev_disable(struct ata_device *dev)
        ata_acpi_on_disable(dev);
        ata_down_xfermask_limit(dev, ATA_DNXFER_FORCE_PIO0 | ATA_DNXFER_QUIET);
        dev->class++;
+
+       /* From now till the next successful probe, ering is used to
+        * track probe failures.  Clear accumulated device error info.
+        */
+       ata_ering_clear(&dev->ering);
 }
 
 /**
@@ -2765,6 +2770,8 @@ static int ata_eh_revalidate_and_attach(struct ata_link *link,
                                                     readid_flags, dev->id);
                        switch (rc) {
                        case 0:
+                               /* clear error info accumulated during probe */
+                               ata_ering_clear(&dev->ering);
                                new_mask |= 1 << dev->devno;
                                break;
                        case -ENOENT:

diff --git a/include/linux/libata.h b/include/linux/libata.h
index bca3ba2..9dcefee 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -580,7 +580,7 @@ struct ata_device {
        acpi_handle             acpi_handle;
        union acpi_object       *gtf_cache;
 #endif
-       /* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
+       /* n_sector is CLEAR_BEGIN, read comment above CLEAR_BEGIN */
        u64                     n_sectors;      /* size of device, if ATA */
        unsigned int            class;          /* ATA_DEV_xxx */
        unsigned long           unpark_deadline;
@@ -605,20 +605,22 @@ struct ata_device {
        u16                     heads;          /* Number of heads */
        u16                     sectors;        /* Number of sectors per track */
 
-       /* error history */
-       int                     spdn_cnt;
-       struct ata_ering        ering;
-
        union {
                u16             id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
                u32             gscr[SATA_PMP_GSCR_DWORDS]; /* PMP GSCR block */
        };
+
+       /* error history */
+       int                     spdn_cnt;
+       /* ering is CLEAR_END, read comment above CLEAR_END */
+       struct ata_ering        ering;
 };
 
-/* Offset into struct ata_device.  Fields above it are maintained
- * acress device init.  Fields below are zeroed.
+/* Fields between ATA_DEVICE_CLEAR_BEGIN and ATA_DEVICE_CLEAR_END are
+ * cleared to zero on ata_dev_init().
  */
-#define ATA_DEVICE_CLEAR_OFFSET                offsetof(struct ata_device, n_sectors)
+#define ATA_DEVICE_CLEAR_BEGIN         offsetof(struct ata_device, n_sectors)
+#define ATA_DEVICE_CLEAR_END           offsetof(struct ata_device, ering)
 
 struct ata_eh_info {
        struct ata_device       *dev;           /* offending device */