mlx4_core: Workaround firmware bug in query dev cap

Commit Message

Eli Cohen Nov. 10, 2010, 12:52 p.m. UTC

None

Patch

diff --git a/drivers/net/mlx4/fw.c b/drivers/net/mlx4/fw.c
index 2327f9e..f1bfa8d 100644
--- a/drivers/net/mlx4/fw.c
+++ b/drivers/net/mlx4/fw.c
@@ -299,6 +299,10 @@  int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
 		MLX4_GET(field, outbox, QUERY_DEV_CAP_LOG_BF_REG_SZ_OFFSET);
 		dev_cap->bf_reg_size = 1 << (field & 0x1f);
 		MLX4_GET(field, outbox, QUERY_DEV_CAP_LOG_MAX_BF_REGS_PER_PAGE_OFFSET);
+		if ((1 << (field & 0x3f)) > (PAGE_SIZE / dev_cap->bf_reg_size)) {
+			mlx4_warn(dev, "log blue flame is invalid (%d), forcing 3\n", field & 0x1f);
+			field = 3;
+		}
 		dev_cap->bf_regs_per_page = 1 << (field & 0x3f);
 		mlx4_dbg(dev, "BlueFlame available (reg size %d, regs/page %d)\n",
 			 dev_cap->bf_reg_size, dev_cap->bf_regs_per_page);