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Message-Id: <20120917003626.895040502@decadent.org.uk>
Date: Mon, 17 Sep 2012 01:36:30 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
alan@...rguk.ukuu.org.uk, Johannes Berg <johannes.berg@...el.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
"John W. Linville" <linville@...driver.com>
Subject: [ 005/135] iwlwifi: fix flow handler debug code
3.2-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Berg <johannes.berg@...el.com>
commit 94543a8d4fb302817014981489f15cb3b92ec3c2 upstream.
iwl_dbgfs_fh_reg_read() can cause crashes and/or
BUG_ON in slub because the ifdefs are wrong, the
code in iwl_dump_fh() should use DEBUGFS, not
DEBUG to protect the buffer writing code.
Also, while at it, clean up the arguments to the
function, some code and make it generally safer.
Reported-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: John W. Linville <linville@...driver.com>
[bwh: Backported to 3.2: adjust filenames and context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h
@@ -303,7 +303,7 @@ int iwl_queue_space(const struct iwl_que
******************************************************/
int iwl_dump_nic_event_log(struct iwl_trans *trans, bool full_log,
char **buf, bool display);
-int iwl_dump_fh(struct iwl_trans *trans, char **buf, bool display);
+int iwl_dump_fh(struct iwl_trans *trans, char **buf);
void iwl_dump_csr(struct iwl_trans *trans);
/*****************************************************
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-rx.c
@@ -678,7 +678,7 @@ static void iwl_irq_handle_error(struct
iwl_dump_nic_error_log(trans);
iwl_dump_csr(trans);
- iwl_dump_fh(trans, NULL, false);
+ iwl_dump_fh(trans, NULL);
iwl_dump_nic_event_log(trans, false, NULL, false);
#ifdef CONFIG_IWLWIFI_DEBUG
if (iwl_get_debug_level(trans->shrd) & IWL_DL_FW_ERRORS)
--- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
+++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
@@ -1541,13 +1541,9 @@ static const char *get_fh_string(int cmd
}
}
-int iwl_dump_fh(struct iwl_trans *trans, char **buf, bool display)
+int iwl_dump_fh(struct iwl_trans *trans, char **buf)
{
int i;
-#ifdef CONFIG_IWLWIFI_DEBUG
- int pos = 0;
- size_t bufsz = 0;
-#endif
static const u32 fh_tbl[] = {
FH_RSCSR_CHNL0_STTS_WPTR_REG,
FH_RSCSR_CHNL0_RBDCB_BASE_REG,
@@ -1559,29 +1555,35 @@ int iwl_dump_fh(struct iwl_trans *trans,
FH_TSSR_TX_STATUS_REG,
FH_TSSR_TX_ERROR_REG
};
-#ifdef CONFIG_IWLWIFI_DEBUG
- if (display) {
- bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
+
+#ifdef CONFIG_IWLWIFI_DEBUGFS
+ if (buf) {
+ int pos = 0;
+ size_t bufsz = ARRAY_SIZE(fh_tbl) * 48 + 40;
+
*buf = kmalloc(bufsz, GFP_KERNEL);
if (!*buf)
return -ENOMEM;
+
pos += scnprintf(*buf + pos, bufsz - pos,
"FH register values:\n");
- for (i = 0; i < ARRAY_SIZE(fh_tbl); i++) {
+
+ for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
pos += scnprintf(*buf + pos, bufsz - pos,
" %34s: 0X%08x\n",
get_fh_string(fh_tbl[i]),
iwl_read_direct32(bus(trans), fh_tbl[i]));
- }
+
return pos;
}
#endif
+
IWL_ERR(trans, "FH register values:\n");
- for (i = 0; i < ARRAY_SIZE(fh_tbl); i++) {
+ for (i = 0; i < ARRAY_SIZE(fh_tbl); i++)
IWL_ERR(trans, " %34s: 0X%08x\n",
get_fh_string(fh_tbl[i]),
iwl_read_direct32(bus(trans), fh_tbl[i]));
- }
+
return 0;
}
@@ -1929,11 +1931,11 @@ static ssize_t iwl_dbgfs_fh_reg_read(str
size_t count, loff_t *ppos)
{
struct iwl_trans *trans = file->private_data;
- char *buf;
+ char *buf = NULL;
int pos = 0;
ssize_t ret = -EFAULT;
- ret = pos = iwl_dump_fh(trans, &buf, true);
+ ret = pos = iwl_dump_fh(trans, &buf);
if (buf) {
ret = simple_read_from_buffer(user_buf,
count, ppos, buf, pos);
--
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