linux-kernel - [PATCH 3.4 90/99] iwlwifi: protect SRAM debugfs

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Date:	Fri,  7 Mar 2014 17:08:26 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Johannes Berg <johannes.berg@...el.com>,
	"John W. Linville" <linville@...driver.com>,
	Jianguo Wu <wujianguo@...wei.com>
Subject: [PATCH 3.4 90/99] iwlwifi: protect SRAM debugfs

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Johannes Berg <johannes.berg@...el.com>

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@...el.com>
Signed-off-by: John W. Linville <linville@...driver.com>
[wujg: Backported to 3.4: adjust context]
Signed-off-by: Jianguo Wu <wujianguo@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/iwlwifi/iwl-debugfs.c |    3 +++
 1 file changed, 3 insertions(+)

--- 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(struc
 	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;


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