SCSI: megaraid_mbox: fix Dell CERC firmware problem

commit 69cd39e94669e2994277a29249b6ef93b088ddbb upstream

Newer Dell CERC firmware (>= 6.62) implement a random deletion handling
compatible with the legacy megaraid driver.  The legacy handling shifted
the target ID by 0x80 only for I/O commands (READ/WRITE/etc), whereas
megaraid_mbox shifts the target ID always if random deletion is supported.
The resulted in megaraid_mbox sending an INQUIRY to the wrong channel, and
not finding any devices, obviously.

So we disable the random deletion support if the offending firmware is
found.

Addresses http://bugzilla.kernel.org/show_bug.cgi?id=6695

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Bo Yang <Bo.Yang@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index 9f041929aca52ee1d978c2652c995125798fa9ce..2d0ee60df107700bef069ce99b88759a3efbcfc1 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -3168,6 +3168,23 @@ megaraid_mbox_support_random_del(adapter_t *adapter)
        uint8_t         raw_mbox[sizeof(mbox_t)];
        int             rval;
 
+       /*
+        * Newer firmware on Dell CERC expect a different
+        * random deletion handling, so disable it.
+        */
+       if (adapter->pdev->vendor == PCI_VENDOR_ID_AMI &&
+           adapter->pdev->device == PCI_DEVICE_ID_AMI_MEGARAID3 &&
+           adapter->pdev->subsystem_vendor == PCI_VENDOR_ID_DELL &&
+           adapter->pdev->subsystem_device == PCI_SUBSYS_ID_CERC_ATA100_4CH &&
+           (adapter->fw_version[0] > '6' ||
+            (adapter->fw_version[0] == '6' &&
+             adapter->fw_version[2] > '6') ||
+            (adapter->fw_version[0] == '6'
+             && adapter->fw_version[2] == '6'
+             && adapter->fw_version[3] > '1'))) {
+               con_log(CL_DLEVEL1, ("megaraid: disable random deletion\n"));
+               return 0;
+       }
 
        mbox = (mbox_t *)raw_mbox;
 

diff --git a/drivers/scsi/megaraid/megaraid_mbox.h b/drivers/scsi/megaraid/megaraid_mbox.h
index 626459d1e9021180c2af19e60576a85eeeb37772..c1d86d961a92df976c63da2dfa0cbd39d1babc52 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_mbox.h
+++ b/drivers/scsi/megaraid/megaraid_mbox.h
@@ -88,6 +88,7 @@
 #define PCI_SUBSYS_ID_PERC3_QC                         0x0471
 #define PCI_SUBSYS_ID_PERC3_DC                         0x0493
 #define PCI_SUBSYS_ID_PERC3_SC                         0x0475
+#define PCI_SUBSYS_ID_CERC_ATA100_4CH                  0x0511
 
 
 #define MBOX_MAX_SCSI_CMDS     128     // number of cmds reserved for kernel