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-rw-r--r--drivers/block/xd.c30
1 files changed, 19 insertions, 11 deletions
diff --git a/drivers/block/xd.c b/drivers/block/xd.c
index 0877d3628fda..d1fd032e7514 100644
--- a/drivers/block/xd.c
+++ b/drivers/block/xd.c
@@ -169,13 +169,6 @@ static int __init xd_init(void)
init_timer (&xd_watchdog_int); xd_watchdog_int.function = xd_watchdog;
- if (!xd_dma_buffer)
- xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
- if (!xd_dma_buffer) {
- printk(KERN_ERR "xd: Out of memory.\n");
- return -ENOMEM;
- }
-
err = -EBUSY;
if (register_blkdev(XT_DISK_MAJOR, "xd"))
goto out1;
@@ -202,6 +195,19 @@ static int __init xd_init(void)
xd_drives,xd_drives == 1 ? "" : "s",xd_irq,xd_dma);
}
+ /*
+ * With the drive detected, xd_maxsectors should now be known.
+ * If xd_maxsectors is 0, nothing was detected and we fall through
+ * to return -ENODEV
+ */
+ if (!xd_dma_buffer && xd_maxsectors) {
+ xd_dma_buffer = (char *)xd_dma_mem_alloc(xd_maxsectors * 0x200);
+ if (!xd_dma_buffer) {
+ printk(KERN_ERR "xd: Out of memory.\n");
+ goto out3;
+ }
+ }
+
err = -ENODEV;
if (!xd_drives)
goto out3;
@@ -249,15 +255,17 @@ out4:
for (i = 0; i < xd_drives; i++)
put_disk(xd_gendisk[i]);
out3:
- release_region(xd_iobase,4);
+ if (xd_maxsectors)
+ release_region(xd_iobase,4);
+
+ if (xd_dma_buffer)
+ xd_dma_mem_free((unsigned long)xd_dma_buffer,
+ xd_maxsectors * 0x200);
out2:
blk_cleanup_queue(xd_queue);
out1a:
unregister_blkdev(XT_DISK_MAJOR, "xd");
out1:
- if (xd_dma_buffer)
- xd_dma_mem_free((unsigned long)xd_dma_buffer,
- xd_maxsectors * 0x200);
return err;
Enomem:
err = -ENOMEM;