scsi: gdth: reuse dma coherent allocation in gdth_show_info

gdth_show_info currently allocs and frees a dma buffer four times which
isn't very efficient. Reuse a single allocation instead.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/scsi/gdth_proc.c

···
 #endif
 
     if (ha->more_proc) {
+        size_t size = max_t(size_t, GDTH_SCRATCH, sizeof(gdth_hget_str));
+
         /* more information: 2. about physical devices */
         seq_puts(m, "\nPhysical Devices:");
         flag = FALSE;
             
-        buf = gdth_ioctl_alloc(ha, GDTH_SCRATCH, FALSE, &paddr);
+        buf = gdth_ioctl_alloc(ha, size, FALSE, &paddr);
         if (!buf) 
             goto stop_output;
         for (i = 0; i < ha->bus_cnt; ++i) {
···
                 }
             }
         }
-        gdth_ioctl_free(ha, GDTH_SCRATCH, buf, paddr);
 
         if (!flag)
             seq_puts(m, "\n --\n");
···
         seq_puts(m, "\nLogical Drives:");
         flag = FALSE;
 
-        buf = gdth_ioctl_alloc(ha, GDTH_SCRATCH, FALSE, &paddr);
-        if (!buf) 
-            goto stop_output;
         for (i = 0; i < MAX_LDRIVES; ++i) {
             if (!ha->hdr[i].is_logdrv)
                 continue;
···
             seq_printf(m,
                            " To Array Drv.:\t%s\n", hrec);
         }       
-        gdth_ioctl_free(ha, GDTH_SCRATCH, buf, paddr);
         
         if (!flag)
             seq_puts(m, "\n --\n");
···
         seq_puts(m, "\nArray Drives:");
         flag = FALSE;
 
-        buf = gdth_ioctl_alloc(ha, GDTH_SCRATCH, FALSE, &paddr);
-        if (!buf) 
-            goto stop_output;
         for (i = 0; i < MAX_LDRIVES; ++i) {
             if (!(ha->hdr[i].is_arraydrv && ha->hdr[i].is_master))
                 continue;
···
                                hrec);
             }
         }
-        gdth_ioctl_free(ha, GDTH_SCRATCH, buf, paddr);
-        
+
         if (!flag)
             seq_puts(m, "\n --\n");
 
···
         seq_puts(m, "\nHost Drives:");
         flag = FALSE;
 
-        buf = gdth_ioctl_alloc(ha, sizeof(gdth_hget_str), FALSE, &paddr);
-        if (!buf) 
-            goto stop_output;
         for (i = 0; i < MAX_LDRIVES; ++i) {
             if (!ha->hdr[i].is_logdrv || 
                 (ha->hdr[i].is_arraydrv && !ha->hdr[i].is_master))
···
                 }
             }
         }
-        gdth_ioctl_free(ha, sizeof(gdth_hget_str), buf, paddr);
+        gdth_ioctl_free(ha, size, buf, paddr);
 
         for (i = 0; i < MAX_HDRIVES; ++i) {
             if (!(ha->hdr[i].present))