From: Johannes Berg <johannes.berg@xxxxxxxxx>
commit 4fc79db178f0a0ede479b4713e00df2d106028b3 upstream.
If the device is not started, we can't read its
SRAM and attempting to do so will cause issues.
Protect the debugfs read.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: John W. Linville <linville@xxxxxxxxxxxxx>
[wujg: Backported to 3.4: adjust context]
Signed-off-by: Jianguo Wu <wujianguo@xxxxxxxxxx>
---
drivers/net/wireless/iwlwifi/iwl-debugfs.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index 2bbaebd..d587bcd 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -227,6 +227,9 @@ static ssize_t iwl_dbgfs_sram_read(struct file *file,
const struct fw_img *img;
size_t bufsz;
+ if (!iwl_is_ready_rf(priv))
+ return -EAGAIN;
+
/* default is to dump the entire data segment */
if (!priv->dbgfs_sram_offset && !priv->dbgfs_sram_len) {
priv->dbgfs_sram_offset = 0x800000;
--
1.7.7
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