diff options
| -rw-r--r-- | drivers/block/cciss.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 42eaddb5438..bf2d1c80b78 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -3416,8 +3416,22 @@ static int check_for_unit_attention(ctlr_info_t *h, CommandList_struct *c) case REPORT_LUNS_CHANGED: printk(KERN_WARNING "cciss%d: report LUN data " "changed\n", h->ctlr); - add_to_scan_list(h); - wake_up_process(cciss_scan_thread); + /* + * Here, we could call add_to_scan_list and wake up the scan thread, + * except that it's quite likely that we will get more than one + * REPORT_LUNS_CHANGED condition in quick succession, which means + * that those which occur after the first one will likely happen + * *during* the scan_thread's rescan. And the rescan code is not + * robust enough to restart in the middle, undoing what it has already + * done, and it's not clear that it's even possible to do this, since + * part of what it does is notify the block layer, which starts + * doing it's own i/o to read partition tables and so on, and the + * driver doesn't have visibility to know what might need undoing. + * In any event, if possible, it is horribly complicated to get right + * so we just don't do it for now. + * + * Note: this REPORT_LUNS_CHANGED condition only occurs on the MSA2012. + */ return 1; break; case POWER_OR_RESET: |