4 files changed, 80 insertions, 1 deletions

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 42d9ce29f50d..7f77c67d267c 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -1628,8 +1628,14 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
                 }
         }
 
+        if (ap->ops->error_handler)
+                ata_eh_release(ap);
+
         rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
 
+        if (ap->ops->error_handler)
+                ata_eh_acquire(ap);
+
         ata_sff_flush_pio_task(ap);
 
         if (!rc) {
@@ -5570,6 +5576,7 @@ struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
         dev_set_drvdata(dev, host);
 
         spin_lock_init(&host->lock);
+        mutex_init(&host->eh_mutex);
         host->dev = dev;
         host->n_ports = max_ports;
 
@@ -5867,6 +5874,7 @@ void ata_host_init(struct ata_host *host, struct device *dev,
                    unsigned long flags, struct ata_port_operations *ops)
 {
         spin_lock_init(&host->lock);
+        mutex_init(&host->eh_mutex);
         host->dev = dev;
         host->flags = flags;
         host->ops = ops;
@@ -6483,9 +6491,31 @@ int ata_ratelimit(void)
         return __ratelimit(&ratelimit);
 }
 
+/**
+ *      ata_msleep - ATA EH owner aware msleep
+ *      @ap: ATA port to attribute the sleep to
+ *      @msecs: duration to sleep in milliseconds
+ *
+ *      Sleeps @msecs.  If the current task is owner of @ap's EH, the
+ *      ownership is released before going to sleep and reacquired
+ *      after the sleep is complete.  IOW, other ports sharing the
+ *      @ap->host will be allowed to own the EH while this task is
+ *      sleeping.
+ *
+ *      LOCKING:
+ *      Might sleep.
+ */
 void ata_msleep(struct ata_port *ap, unsigned int msecs)
 {
+        bool owns_eh = ap && ap->host->eh_owner == current;
+
+        if (owns_eh)
+                ata_eh_release(ap);
+
         msleep(msecs);
+
+        if (owns_eh)
+                ata_eh_acquire(ap);
 }
 
 /**
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 6780f4d16e81..5e590504f3aa 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -463,6 +463,41 @@ static void ata_eh_clear_action(struct ata_link *link, struct ata_device *dev,
 }
 
 /**
+ *      ata_eh_acquire - acquire EH ownership
+ *      @ap: ATA port to acquire EH ownership for
+ *
+ *      Acquire EH ownership for @ap.  This is the basic exclusion
+ *      mechanism for ports sharing a host.  Only one port hanging off
+ *      the same host can claim the ownership of EH.
+ *
+ *      LOCKING:
+ *      EH context.
+ */
+void ata_eh_acquire(struct ata_port *ap)
+{
+        mutex_lock(&ap->host->eh_mutex);
+        WARN_ON_ONCE(ap->host->eh_owner);
+        ap->host->eh_owner = current;
+}
+
+/**
+ *      ata_eh_release - release EH ownership
+ *      @ap: ATA port to release EH ownership for
+ *
+ *      Release EH ownership for @ap if the caller.  The caller must
+ *      have acquired EH ownership using ata_eh_acquire() previously.
+ *
+ *      LOCKING:
+ *      EH context.
+ */
+void ata_eh_release(struct ata_port *ap)
+{
+        WARN_ON_ONCE(ap->host->eh_owner != current);
+        ap->host->eh_owner = NULL;
+        mutex_unlock(&ap->host->eh_mutex);
+}
+
+/**
  *      ata_scsi_timed_out - SCSI layer time out callback
  *      @cmd: timed out SCSI command
  *
@@ -639,11 +674,13 @@ void ata_scsi_error(struct Scsi_Host *host)
         /* If we timed raced normal completion and there is nothing to
            recover nr_timedout == 0 why exactly are we doing error recovery ? */
 
- repeat:
         /* invoke error handler */
         if (ap->ops->error_handler) {
                 struct ata_link *link;
 
+                /* acquire EH ownership */
+                ata_eh_acquire(ap);
+ repeat:
                 /* kill fast drain timer */
                 del_timer_sync(&ap->fastdrain_timer);
 
@@ -718,6 +755,7 @@ void ata_scsi_error(struct Scsi_Host *host)
                 host->host_eh_scheduled = 0;
 
                 spin_unlock_irqrestore(ap->lock, flags);
+                ata_eh_release(ap);
         } else {
                 WARN_ON(ata_qc_from_tag(ap, ap->link.active_tag) == NULL);
                 ap->ops->eng_timeout(ap);
@@ -2818,8 +2856,10 @@ int ata_eh_reset(struct ata_link *link, int classify,
                         "reset failed (errno=%d), retrying in %u secs\n",
                         rc, DIV_ROUND_UP(jiffies_to_msecs(delta), 1000));
 
+                ata_eh_release(ap);
                 while (delta)
                         delta = schedule_timeout_uninterruptible(delta);
+                ata_eh_acquire(ap);
         }
 
         if (try == max_tries - 1) {
@@ -3635,8 +3675,10 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
                 if (time_before_eq(deadline, now))
                         break;
 
+                ata_eh_release(ap);
                 deadline = wait_for_completion_timeout(&ap->park_req_pending,
                                                        deadline - now);
+                ata_eh_acquire(ap);
         } while (deadline);
         ata_for_each_link(link, ap, EDGE) {
                 ata_for_each_dev(dev, link, ALL) {
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 7c070a4b1c08..a9be110dbf51 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -145,6 +145,8 @@ extern int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
 /* libata-eh.c */
 extern unsigned long ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd);
 extern void ata_internal_cmd_timed_out(struct ata_device *dev, u8 cmd);
+extern void ata_eh_acquire(struct ata_port *ap);
+extern void ata_eh_release(struct ata_port *ap);
 extern enum blk_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
 extern void ata_scsi_error(struct Scsi_Host *host);
 extern void ata_port_wait_eh(struct ata_port *ap);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 2fbd22bd68ce..52112d39d71e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -37,6 +37,7 @@
 #include <scsi/scsi_host.h>
 #include <linux/acpi.h>
 #include <linux/cdrom.h>
+#include <linux/sched.h>
 
 /*
  * Define if arch has non-standard setup.  This is a _PCI_ standard
@@ -535,6 +536,10 @@ struct ata_host {
         void                    *private_data;
         struct ata_port_operations *ops;
         unsigned long           flags;
+
+        struct mutex            eh_mutex;
+        struct task_struct      *eh_owner;
+
 #ifdef CONFIG_ATA_ACPI
         acpi_handle             acpi_handle;
 #endif