These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / ata / libata-eh.c

diff --git a/kernel/drivers/ata/libata-eh.c b/kernel/drivers/ata/libata-eh.c
index cb0508a..961acc7 100644 (file)
--- a/kernel/drivers/ata/libata-eh.c
+++ b/kernel/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) &&