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-rw-r--r--drivers/block/cciss.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 62b6c2cc80b5..edfa2515bc86 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1189,6 +1189,7 @@ static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
int err;
u32 cp;
+ memset(&arg64, 0, sizeof(arg64));
err = 0;
err |=
copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
@@ -4258,6 +4259,13 @@ static void cciss_find_board_params(ctlr_info_t *h)
h->nr_cmds = h->max_commands - 4 - cciss_tape_cmds;
h->maxsgentries = readl(&(h->cfgtable->MaxSGElements));
/*
+ * The P600 may exhibit poor performnace under some workloads
+ * if we use the value in the configuration table. Limit this
+ * controller to MAXSGENTRIES (32) instead.
+ */
+ if (h->board_id == 0x3225103C)
+ h->maxsgentries = MAXSGENTRIES;
+ /*
* Limit in-command s/g elements to 32 save dma'able memory.
* Howvever spec says if 0, use 31
*/