From: Eli Cohen Date: Wed, 10 Nov 2010 12:52:37 +0000 (+0000) Subject: mlx4_core: Workaround firmware bug in query dev cap X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=58d74bb1d9f79bb56b2ea51d2ca06a28fa0fce02;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git mlx4_core: Workaround firmware bug in query dev cap ConnectX firmware is supposed to report the number blue flame registers per page as log2 of the value. However, due to a firmware bug, it reports actual number. This patch works around this by checking if the number of registers calculated fits within a page. If it does not, we use 8 registers per page. Signed-off-by: Eli Cohen Signed-off-by: Roland Dreier --- diff --git a/drivers/net/mlx4/fw.c b/drivers/net/mlx4/fw.c index b68eee2414c2..7a7e18ba278a 100644 --- a/drivers/net/mlx4/fw.c +++ b/drivers/net/mlx4/fw.c @@ -289,6 +289,10 @@ 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, "firmware bug: log2 # of blue flame regs 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);