libata-eh.c: Introduce new ata port flag for controller which lockup on read log...

Some controller lockup on a ata_read_log_page.
Add new ata port flag ATA_FLAG_NO_LOG_PAGE which can used
to blacklist a controller.

If this flag is set, any attempt to read a log page returns an error
without actually issuing the command.

Signed-off-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index cb0508a..961acc7 100644 (file)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1505,12 +1505,20 @@ static const char *ata_err_string(unsigned int err_mask)
 unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
                               u8 page, void *buf, unsigned int sectors)
 {
+       unsigned long ap_flags = dev->link->ap->flags;
        struct ata_taskfile tf;
        unsigned int err_mask;
        bool dma = false;
 
        DPRINTK("read log page - log 0x%x, page 0x%x\n", log, page);
 
+       /*
+        * Return error without actually issuing the command on controllers
+        * which e.g. lockup on a read log page.
+        */
+       if (ap_flags & ATA_FLAG_NO_LOG_PAGE)
+               return AC_ERR_DEV;
+
 retry:
        ata_tf_init(dev, &tf);
        if (dev->dma_mode && ata_id_has_read_log_dma_ext(dev->id) &&

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 83577f8..600c1e0 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -210,6 +210,7 @@ enum {
        ATA_FLAG_SLAVE_POSS     = (1 << 0), /* host supports slave dev */
                                            /* (doesn't imply presence) */
        ATA_FLAG_SATA           = (1 << 1),
+       ATA_FLAG_NO_LOG_PAGE    = (1 << 5), /* do not issue log page read */
        ATA_FLAG_NO_ATAPI       = (1 << 6), /* No ATAPI support */
        ATA_FLAG_PIO_DMA        = (1 << 7), /* PIO cmds via DMA */
        ATA_FLAG_PIO_LBA48      = (1 << 8), /* Host DMA engine is LBA28 only */