On Friday 10 October 2008, Dave wrote: > > Andrey Borzenkov wrote: > > On Friday 10 October 2008, Dave wrote: > >> You're right. pda_size is supposed to be the maximum size of the PDA (in bytes) that we expect with the firmware. It should be set to 0x200. > >> > > > > Do you want me to send a patch? > > Could you fix it as part of the patch you submitted? > Attached. As other entries use decimal I thought it is more logical to use 512 as well.
Subject: [PATCH] orinoco: reduce stack usage in firmware download path
From: Andrey Borzenkov < arvidjaar@xxxxxxx>
orinoco_dl_firmware and symbol_dl_mage allocate large local
variables (1K); at least orinoco fails with panic or hung
kernel if 4K stacks is enabled.
Allocate large buffers dynamically at run time.
Tested-By: Andrey Borzenkov <arvidjaar@xxxxxxx> for Agere case
Signed-off-by: Andrey Borzenkov < arvidjaar@xxxxxxx>
---
drivers/net/wireless/orinoco.c | 42 ++++++++++++++++++++++++++++------------
1 files changed, 29 insertions(+), 13 deletions(-)
diff --git a/drivers/net/wireless/orinoco.c b/drivers/net/wireless/orinoco.c
index 9a2fcc0..1f9dcc4 100644
--- a/drivers/net/wireless/orinoco.c
+++ b/drivers/net/wireless/orinoco.c
@@ -433,7 +433,7 @@ struct fw_info {
const static struct fw_info orinoco_fw[] = {
{ "", "agere_sta_fw.bin", "agere_ap_fw.bin", 0x00390000, 1000 },
{ "", "prism_sta_fw.bin", "prism_ap_fw.bin", 0, 1024 },
- { "symbol_sp24t_prim_fw", "symbol_sp24t_sec_fw", "", 0x00003100, 0x100 }
+ { "symbol_sp24t_prim_fw", "symbol_sp24t_sec_fw", "", 0x00003100, 512 }
};
/* Structure used to access fields in FW
@@ -458,7 +458,7 @@ orinoco_dl_firmware(struct orinoco_private *priv,
int ap)
{
/* Plug Data Area (PDA) */
- __le16 pda[512] = { 0 };
+ __le16 *pda;
hermes_t *hw = &priv->hw;
const struct firmware *fw_entry;
@@ -467,7 +467,11 @@ orinoco_dl_firmware(struct orinoco_private *priv,
const unsigned char *end;
const char *firmware;
struct net_device *dev = priv->ndev;
- int err;
+ int err = 0;
+
+ pda = kzalloc(fw->pda_size, GFP_KERNEL);
+ if (!pda)
+ return -ENOMEM;
if (ap)
firmware = fw->ap_fw;
@@ -478,17 +482,17 @@ orinoco_dl_firmware(struct orinoco_private *priv,
dev->name, firmware);
/* Read current plug data */
- err = hermes_read_pda(hw, pda, fw->pda_addr,
- min_t(u16, fw->pda_size, sizeof(pda)), 0);
+ err = hermes_read_pda(hw, pda, fw->pda_addr, fw->pda_size, 0);
printk(KERN_DEBUG "%s: Read PDA returned %d\n", dev->name, err);
if (err)
- return err;
+ goto free;
err = request_firmware(&fw_entry, firmware, priv->dev);
if (err) {
printk(KERN_ERR "%s: Cannot find firmware %s\n",
dev->name, firmware);
- return -ENOENT;
+ err = -ENOENT;
+ goto free;
}
hdr = (const struct orinoco_fw_header *) fw_entry->data;
@@ -532,6 +536,9 @@ orinoco_dl_firmware(struct orinoco_private *priv,
abort:
release_firmware(fw_entry);
+
+free:
+ kfree(pda);
return err;
}
@@ -549,12 +556,12 @@ symbol_dl_image(struct orinoco_private *priv, const struct fw_info *fw,
int secondary)
{
hermes_t *hw = &priv->hw;
- int ret;
+ int ret = 0;
const unsigned char *ptr;
const unsigned char *first_block;
/* Plug Data Area (PDA) */
- __le16 pda[256];
+ __le16 *pda = NULL;
/* Binary block begins after the 0x1A marker */
ptr = image;
@@ -563,28 +570,33 @@ symbol_dl_image(struct orinoco_private *priv, const struct fw_info *fw,
/* Read the PDA from EEPROM */
if (secondary) {
- ret = hermes_read_pda(hw, pda, fw->pda_addr, sizeof(pda), 1);
+ pda = kzalloc(fw->pda_size, GFP_KERNEL);
+ if (!pda)
+ return -ENOMEM;
+
+ ret = hermes_read_pda(hw, pda, fw->pda_addr, fw->pda_size, 1);
if (ret)
- return ret;
+ goto free;
}
/* Stop the firmware, so that it can be safely rewritten */
if (priv->stop_fw) {
ret = priv->stop_fw(priv, 1);
if (ret)
- return ret;
+ goto free;
}
/* Program the adapter with new firmware */
ret = hermes_program(hw, first_block, end);
if (ret)
- return ret;
+ goto free;
/* Write the PDA to the adapter */
if (secondary) {
size_t len = hermes_blocks_length(first_block);
ptr = first_block + len;
ret = hermes_apply_pda(hw, ptr, pda);
+ kfree(pda);
if (ret)
return ret;
}
@@ -608,6 +620,10 @@ symbol_dl_image(struct orinoco_private *priv, const struct fw_info *fw,
return -ENODEV;
return 0;
+
+free:
+ kfree(pda);
+ return ret;
}
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