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Date: Wed, 3 Oct 2012 18:52:32 +0530
From: Vipul Pandya <vipul@...lsio.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, divy@...lsio.com, dm@...lsio.com,
leedom@...lsio.com, felix@...lsio.com,
Vipul Pandya <vipul@...lsio.com>,
Jay Hernandez <jay@...lsio.com>
Subject: [PATCH] cxgb4: Dynamically allocate memory in t4_memory_rw() and get_vpd_params()
This patch changes memory allocation to reduce stack footprint
Signed-off-by: Jay Hernandez <jay@...lsio.com>
Signed-off-by: Vipul Pandya <vipul@...lsio.com>
---
drivers/net/ethernet/chelsio/cxgb4/t4_hw.c | 43 +++++++++++++++++++--------
1 files changed, 30 insertions(+), 13 deletions(-)
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index 35b81d8..137a244 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -408,7 +408,8 @@ static int t4_memory_rw(struct adapter *adap, int mtype, u32 addr, u32 len,
__be32 *buf, int dir)
{
u32 pos, start, end, offset, memoffset;
- int ret;
+ int ret = 0;
+ __be32 *data;
/*
* Argument sanity checks ...
@@ -416,6 +417,10 @@ static int t4_memory_rw(struct adapter *adap, int mtype, u32 addr, u32 len,
if ((addr & 0x3) || (len & 0x3))
return -EINVAL;
+ data = vmalloc(MEMWIN0_APERTURE/sizeof(__be32));
+ if (!data)
+ return -ENOMEM;
+
/*
* Offset into the region of memory which is being accessed
* MEM_EDC0 = 0
@@ -438,7 +443,6 @@ static int t4_memory_rw(struct adapter *adap, int mtype, u32 addr, u32 len,
offset = (addr - start)/sizeof(__be32);
for (pos = start; pos < end; pos += MEMWIN0_APERTURE, offset = 0) {
- __be32 data[MEMWIN0_APERTURE/sizeof(__be32)];
/*
* If we're writing, copy the data from the caller's memory
@@ -452,7 +456,7 @@ static int t4_memory_rw(struct adapter *adap, int mtype, u32 addr, u32 len,
if (offset || len < MEMWIN0_APERTURE) {
ret = t4_mem_win_rw(adap, pos, data, 1);
if (ret)
- return ret;
+ break;
}
while (offset < (MEMWIN0_APERTURE/sizeof(__be32)) &&
len > 0) {
@@ -466,7 +470,7 @@ static int t4_memory_rw(struct adapter *adap, int mtype, u32 addr, u32 len,
*/
ret = t4_mem_win_rw(adap, pos, data, dir);
if (ret)
- return ret;
+ break;
/*
* If we're reading, copy the data into the caller's memory
@@ -480,7 +484,8 @@ static int t4_memory_rw(struct adapter *adap, int mtype, u32 addr, u32 len,
}
}
- return 0;
+ vfree(data);
+ return ret;
}
int t4_memory_write(struct adapter *adap, int mtype, u32 addr, u32 len,
@@ -519,16 +524,21 @@ int get_vpd_params(struct adapter *adapter, struct vpd_params *p)
u32 cclk_param, cclk_val;
int i, ret;
int ec, sn;
- u8 vpd[VPD_LEN], csum;
+ u8 *vpd, csum;
unsigned int vpdr_len, kw_offset, id_len;
- ret = pci_read_vpd(adapter->pdev, VPD_BASE, sizeof(vpd), vpd);
+ vpd = vmalloc(VPD_LEN);
+ if (!vpd)
+ return -ENOMEM;
+
+ ret = pci_read_vpd(adapter->pdev, VPD_BASE, VPD_LEN, vpd);
if (ret < 0)
- return ret;
+ goto out;
if (vpd[0] != PCI_VPD_LRDT_ID_STRING) {
dev_err(adapter->pdev_dev, "missing VPD ID string\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
id_len = pci_vpd_lrdt_size(vpd);
@@ -538,21 +548,24 @@ int get_vpd_params(struct adapter *adapter, struct vpd_params *p)
i = pci_vpd_find_tag(vpd, 0, VPD_LEN, PCI_VPD_LRDT_RO_DATA);
if (i < 0) {
dev_err(adapter->pdev_dev, "missing VPD-R section\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
vpdr_len = pci_vpd_lrdt_size(&vpd[i]);
kw_offset = i + PCI_VPD_LRDT_TAG_SIZE;
if (vpdr_len + kw_offset > VPD_LEN) {
dev_err(adapter->pdev_dev, "bad VPD-R length %u\n", vpdr_len);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
#define FIND_VPD_KW(var, name) do { \
var = pci_vpd_find_info_keyword(vpd, kw_offset, vpdr_len, name); \
if (var < 0) { \
dev_err(adapter->pdev_dev, "missing VPD keyword " name "\n"); \
- return -EINVAL; \
+ ret = -EINVAL; \
+ goto out; \
} \
var += PCI_VPD_INFO_FLD_HDR_SIZE; \
} while (0)
@@ -564,7 +577,8 @@ int get_vpd_params(struct adapter *adapter, struct vpd_params *p)
if (csum) {
dev_err(adapter->pdev_dev,
"corrupted VPD EEPROM, actual csum %u\n", csum);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
FIND_VPD_KW(ec, "EC");
@@ -587,6 +601,9 @@ int get_vpd_params(struct adapter *adapter, struct vpd_params *p)
FW_PARAMS_PARAM_X(FW_PARAMS_PARAM_DEV_CCLK));
ret = t4_query_params(adapter, adapter->mbox, 0, 0,
1, &cclk_param, &cclk_val);
+
+out:
+ vfree(vpd);
if (ret)
return ret;
p->cclk = cclk_val;
--
1.7.1
--
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