Re: [PATCH] libata: skip reset on bus not a device

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On 10/9/06, Tejun Heo <htejun@xxxxxxxxx> wrote:
On Mon, Oct 09, 2006 at 04:00:33PM +0900, Tejun Heo wrote:
> Joe Jin wrote:
> >>SRST failure would have still occurred but 30sec timeout should have
> >>gone.  Can you post full dmesg?
> >
> >Yes it is.
> >attachment is the output of dmesg
>
> Great.
>
> >>Also, please test the patch in the following mail.  You can use either
> >>git or download the full kernel tarball to get the modified kernel.
> >>
> >
> >Did the pathc against 2.6.19-rc1?
> >I have test it, but it have not any change and timeout also appeared :(
>
> It's against libata development tree.  So, you downloaded the tar.gz and
> tested it?

And, one more thing to try.  The following patch should fix your
problem.  It's against v2.6.18.

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 427b73a..3bc7f57 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -2271,11 +2271,14 @@ static inline void ata_tf_to_host(struct
  *     Sleep until ATA Status register bit BSY clears,
  *     or a timeout occurs.
  *
- *     LOCKING: None.
+ *     LOCKING:
+ *     Kernel thread context (may sleep).
+ *
+ *     RETURNS:
+ *     0 on success, -errno otherwise.
  */
-
-unsigned int ata_busy_sleep (struct ata_port *ap,
-                            unsigned long tmout_pat, unsigned long tmout)
+int ata_busy_sleep(struct ata_port *ap,
+                  unsigned long tmout_pat, unsigned long tmout)
 {
        unsigned long timer_start, timeout;
        u8 status;
@@ -2283,25 +2286,30 @@ unsigned int ata_busy_sleep (struct ata_
        status = ata_busy_wait(ap, ATA_BUSY, 300);
        timer_start = jiffies;
        timeout = timer_start + tmout_pat;
-       while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
+       while (status != 0xff && (status & ATA_BUSY) &&
+              time_before(jiffies, timeout)) {
                msleep(50);
                status = ata_busy_wait(ap, ATA_BUSY, 3);
        }

-       if (status & ATA_BUSY)
+       if (status != 0xff && (status & ATA_BUSY))
                ata_port_printk(ap, KERN_WARNING,
                                "port is slow to respond, please be patient\n");

        timeout = timer_start + tmout;
-       while ((status & ATA_BUSY) && (time_before(jiffies, timeout))) {
+       while (status != 0xff && (status & ATA_BUSY) &&
+              time_before(jiffies, timeout)) {
                msleep(50);
                status = ata_chk_status(ap);
        }

+       if (status == 0xff)
+               return -ENODEV;
+
        if (status & ATA_BUSY) {
                ata_port_printk(ap, KERN_ERR, "port failed to respond "
                                "(%lu secs)\n", tmout / HZ);
-               return 1;
+               return -EBUSY;
        }

        return 0;
@@ -2392,10 +2400,8 @@ static unsigned int ata_bus_softreset(st
         * the bus shows 0xFF because the odd clown forgets the D7
         * pulldown resistor.
         */
-       if (ata_check_status(ap) == 0xFF) {
-               ata_port_printk(ap, KERN_ERR, "SRST failed (status 0xFF)\n");
-               return AC_ERR_OTHER;
-       }
+       if (ata_check_status(ap) == 0xFF)
+               return 0;

        ata_bus_post_reset(ap, devmask);

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 66c3100..eb7d90f 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -702,9 +702,8 @@ extern int ata_host_set_suspend(struct a
                                pm_message_t mesg);
 extern void ata_host_set_resume(struct ata_host_set *host_set);
 extern int ata_ratelimit(void);
-extern unsigned int ata_busy_sleep(struct ata_port *ap,
-                                  unsigned long timeout_pat,
-                                  unsigned long timeout);
+extern int ata_busy_sleep(struct ata_port *ap,
+                         unsigned long timeout_pat, unsigned long timeout);
 extern void ata_port_queue_task(struct ata_port *ap, void (*fn)(void *),
                                void *data, unsigned long delay);
 extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
@@ -1019,7 +1018,7 @@ static inline u8 ata_busy_wait(struct at
                udelay(10);
                status = ata_chk_status(ap);
                max--;
-       } while ((status & bits) && (max > 0));
+       } while (status != 0xff && (status & bits) && (max > 0));

        return status;
 }
@@ -1040,7 +1039,7 @@ static inline u8 ata_wait_idle(struct at
 {
        u8 status = ata_busy_wait(ap, ATA_BUSY | ATA_DRQ, 1000);

-       if (status & (ATA_BUSY | ATA_DRQ)) {
+       if (status != 0xff && (status & (ATA_BUSY | ATA_DRQ))) {
                unsigned long l = ap->ioaddr.status_addr;
                if (ata_msg_warn(ap))
                        printk(KERN_WARNING "ATA: abnormal status 0x%X on port 0x%lX\n",

-

Is this patch going to go upstream?  I've been testing 2.6.18 on a
couple different systems and seen the same issue.  I haven't tested
the patch yet.
-
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