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[3.6,2/2] iwlwifi: protect SRAM debugfs

Message ID 1345568231-20584-3-git-send-email-johannes@sipsolutions.net (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Johannes Berg Aug. 21, 2012, 4:57 p.m. UTC 
From: Johannes Berg <johannes.berg@intel.com>

If the device is not started, we can't read its
SRAM and attempting to do so will cause issues.
Protect the debugfs read.

Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 drivers/net/wireless/iwlwifi/dvm/debugfs.c |    3 +++
 1 file changed, 3 insertions(+)
diff mbox

Patch

diff --git a/drivers/net/wireless/iwlwifi/dvm/debugfs.c b/drivers/net/wireless/iwlwifi/dvm/debugfs.c
index 46782f1..a47b306 100644
--- a/drivers/net/wireless/iwlwifi/dvm/debugfs.c
+++ b/drivers/net/wireless/iwlwifi/dvm/debugfs.c
@@ -124,6 +124,9 @@  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;