From c915033fc62d7186d243d89f88782d6be33fd8f6 Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Sun, 18 Sep 2005 13:52:06 -0700 Subject: [PATCH] [PATCH] IB/mthca: Initialize eq->nent before we use it In mthca_create_eq(), we call get_eqe() before setting eq->nent. This is wrong, because get_eqe() uses eq->nent. Fix this, and clean up the code a little while we're at it. (We got lucky with the current code, because eq->nent was cleared to 0, which get_eqe() made happen to do the right thing) Pointed out by Michael S. Tsirkin Signed-off-by: Roland Dreier --- drivers/infiniband/hw/mthca/mthca_eq.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/infiniband/hw/mthca/mthca_eq.c b/drivers/infiniband/hw/mthca/mthca_eq.c index 18f0981eb0c1..78152a8ad17d 100644 --- a/drivers/infiniband/hw/mthca/mthca_eq.c +++ b/drivers/infiniband/hw/mthca/mthca_eq.c @@ -476,12 +476,8 @@ static int __devinit mthca_create_eq(struct mthca_dev *dev, int i; u8 status; - /* Make sure EQ size is aligned to a power of 2 size. */ - for (i = 1; i < nent; i <<= 1) - ; /* nothing */ - nent = i; - - eq->dev = dev; + eq->dev = dev; + eq->nent = roundup_pow_of_two(max(nent, 2)); eq->page_list = kmalloc(npages * sizeof *eq->page_list, GFP_KERNEL); @@ -512,7 +508,7 @@ static int __devinit mthca_create_eq(struct mthca_dev *dev, memset(eq->page_list[i].buf, 0, PAGE_SIZE); } - for (i = 0; i < nent; ++i) + for (i = 0; i < eq->nent; ++i) set_eqe_hw(get_eqe(eq, i)); eq->eqn = mthca_alloc(&dev->eq_table.alloc); @@ -528,8 +524,6 @@ static int __devinit mthca_create_eq(struct mthca_dev *dev, if (err) goto err_out_free_eq; - eq->nent = nent; - memset(eq_context, 0, sizeof *eq_context); eq_context->flags = cpu_to_be32(MTHCA_EQ_STATUS_OK | MTHCA_EQ_OWNER_HW | @@ -538,7 +532,7 @@ static int __devinit mthca_create_eq(struct mthca_dev *dev, if (mthca_is_memfree(dev)) eq_context->flags |= cpu_to_be32(MTHCA_EQ_STATE_ARBEL); - eq_context->logsize_usrpage = cpu_to_be32((ffs(nent) - 1) << 24); + eq_context->logsize_usrpage = cpu_to_be32((ffs(eq->nent) - 1) << 24); if (mthca_is_memfree(dev)) { eq_context->arbel_pd = cpu_to_be32(dev->driver_pd.pd_num); } else { @@ -569,7 +563,7 @@ static int __devinit mthca_create_eq(struct mthca_dev *dev, dev->eq_table.arm_mask |= eq->eqn_mask; mthca_dbg(dev, "Allocated EQ %d with %d entries\n", - eq->eqn, nent); + eq->eqn, eq->nent); return err;