Merge tag 'v3.10.107' into update

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / storvsc_drv.c

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 16a3a0cc96723c5c0fca08ae54638aecb1f18dcd..58d898cdff0a17c2a3083ee55c664ff3274a5513 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -33,6 +33,7 @@
 #include <linux/device.h>
 #include <linux/hyperv.h>
 #include <linux/mempool.h>
+#include <linux/blkdev.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_host.h>
@@ -203,6 +204,7 @@ enum storvsc_request_type {
 #define SRB_STATUS_SUCCESS     0x01
 #define SRB_STATUS_ABORTED     0x02
 #define SRB_STATUS_ERROR       0x04
+#define SRB_STATUS_DATA_OVERRUN        0x12
 
 /*
  * This is the end of Protocol specific defines.
@@ -630,21 +632,22 @@ static unsigned int copy_to_bounce_buffer(struct scatterlist *orig_sgl,
                        if (bounce_sgl[j].length == PAGE_SIZE) {
                                /* full..move to next entry */
                                sg_kunmap_atomic(bounce_addr);
+                               bounce_addr = 0;
                                j++;
+                       }
 
-                               /* if we need to use another bounce buffer */
-                               if (srclen || i != orig_sgl_count - 1)
-                                       bounce_addr = sg_kmap_atomic(bounce_sgl,j);
+                       /* if we need to use another bounce buffer */
+                       if (srclen && bounce_addr == 0)
+                               bounce_addr = sg_kmap_atomic(bounce_sgl, j);
 
-                       } else if (srclen == 0 && i == orig_sgl_count - 1) {
-                               /* unmap the last bounce that is < PAGE_SIZE */
-                               sg_kunmap_atomic(bounce_addr);
-                       }
                }
 
                sg_kunmap_atomic(src_addr - orig_sgl[i].offset);
        }
 
+       if (bounce_addr)
+               sg_kunmap_atomic(bounce_addr);
+
        local_irq_restore(flags);
 
        return total_copied;
@@ -792,6 +795,13 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
 
        switch (vm_srb->srb_status) {
        case SRB_STATUS_ERROR:
+               /*
+                * Let upper layer deal with error when
+                * sense message is present.
+                */
+
+               if (vm_srb->srb_status & SRB_STATUS_AUTOSENSE_VALID)
+                       break;
                /*
                 * If there is an error; offline the device since all
                 * error recovery strategies would have already been
@@ -803,6 +813,13 @@ static void storvsc_handle_error(struct vmscsi_request *vm_srb,
                case ATA_12:
                        set_host_byte(scmnd, DID_PASSTHROUGH);
                        break;
+               /*
+                * On Some Windows hosts TEST_UNIT_READY command can return
+                * SRB_STATUS_ERROR, let the upper level code deal with it
+                * based on the sense information.
+                */
+               case TEST_UNIT_READY:
+                       break;
                default:
                        set_host_byte(scmnd, DID_TARGET_FAILURE);
                }
@@ -850,6 +867,7 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
        struct scsi_sense_hdr sense_hdr;
        struct vmscsi_request *vm_srb;
        struct stor_mem_pools *memp = scmnd->device->hostdata;
+       u32 data_transfer_length;
        struct Scsi_Host *host;
        struct storvsc_device *stor_dev;
        struct hv_device *dev = host_dev->dev;
@@ -858,6 +876,7 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
        host = stor_dev->host;
 
        vm_srb = &cmd_request->vstor_packet.vm_srb;
+       data_transfer_length = vm_srb->data_transfer_length;
        if (cmd_request->bounce_sgl_count) {
                if (vm_srb->data_in == READ_TYPE)
                        copy_from_bounce_buffer(scsi_sglist(scmnd),
@@ -876,13 +895,20 @@ static void storvsc_command_completion(struct storvsc_cmd_request *cmd_request)
                        scsi_print_sense_hdr("storvsc", &sense_hdr);
        }
 
-       if (vm_srb->srb_status != SRB_STATUS_SUCCESS)
+       if (vm_srb->srb_status != SRB_STATUS_SUCCESS) {
                storvsc_handle_error(vm_srb, scmnd, host, sense_hdr.asc,
                                         sense_hdr.ascq);
+               /*
+                * The Windows driver set data_transfer_length on
+                * SRB_STATUS_DATA_OVERRUN. On other errors, this value
+                * is untouched.  In these cases we set it to 0.
+                */
+               if (vm_srb->srb_status != SRB_STATUS_DATA_OVERRUN)
+                       data_transfer_length = 0;
+       }
 
        scsi_set_resid(scmnd,
-               cmd_request->data_buffer.len -
-               vm_srb->data_transfer_length);
+               cmd_request->data_buffer.len - data_transfer_length);
 
        scsi_done_fn = scmnd->scsi_done;
 
@@ -1189,6 +1215,9 @@ static void storvsc_device_destroy(struct scsi_device *sdevice)
 {
        struct stor_mem_pools *memp = sdevice->hostdata;
 
+       if (!memp)
+               return;
+
        mempool_destroy(memp->request_mempool);
        kmem_cache_destroy(memp->request_pool);
        kfree(memp);
@@ -1282,6 +1311,16 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd)
        return SUCCESS;
 }
 
+/*
+ * The host guarantees to respond to each command, although I/O latencies might
+ * be unbounded on Azure.  Reset the timer unconditionally to give the host a
+ * chance to perform EH.
+ */
+static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
+{
+       return BLK_EH_RESET_TIMER;
+}
+
 static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd)
 {
        bool allowed = true;
@@ -1418,13 +1457,12 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
        if (ret == -EAGAIN) {
                /* no more space */
 
-               if (cmd_request->bounce_sgl_count) {
+               if (cmd_request->bounce_sgl_count)
                        destroy_bounce_buffer(cmd_request->bounce_sgl,
                                        cmd_request->bounce_sgl_count);
 
-                       ret = SCSI_MLQUEUE_DEVICE_BUSY;
-                       goto queue_error;
-               }
+               ret = SCSI_MLQUEUE_DEVICE_BUSY;
+               goto queue_error;
        }
 
        return 0;
@@ -1441,6 +1479,7 @@ static struct scsi_host_template scsi_driver = {
        .bios_param =           storvsc_get_chs,
        .queuecommand =         storvsc_queuecommand,
        .eh_host_reset_handler =        storvsc_host_reset_handler,
+       .eh_timed_out =         storvsc_eh_timed_out,
        .slave_alloc =          storvsc_device_alloc,
        .slave_destroy =        storvsc_device_destroy,
        .slave_configure =      storvsc_device_configure,
@@ -1454,6 +1493,7 @@ static struct scsi_host_template scsi_driver = {
        .use_clustering =       DISABLE_CLUSTERING,
        /* Make sure we dont get a sg segment crosses a page boundary */
        .dma_boundary =         PAGE_SIZE-1,
+       .no_write_same =        1,
 };
 
 enum {