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[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 <mst@mellanox.co.il>

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2005-09-18 13:52:06 -07:00
parent ce5b65cc96
commit c915033fc6
1 changed files with 5 additions and 11 deletions
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16
drivers/infiniband/hw/mthca/mthca_eq.c
View File

@ -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;