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iwlwifi: protect SRAM debugfs 

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>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2012-08-21 18:57:11 +02:00 committed by John W. Linville
parent 94543a8d4f
commit 4fc79db178
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/iwlwifi/dvm/debugfs.c
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@ -124,6 +124,9 @@ static ssize_t iwl_dbgfs_sram_read(struct file *file,
const struct fw_img *img; const struct fw_img *img;
size_t bufsz; size_t bufsz;
if (!iwl_is_ready_rf(priv))
return -EAGAIN;
/* default is to dump the entire data segment */ /* default is to dump the entire data segment */
if (!priv->dbgfs_sram_offset && !priv->dbgfs_sram_len) { if (!priv->dbgfs_sram_offset && !priv->dbgfs_sram_len) {
priv->dbgfs_sram_offset = 0x800000; priv->dbgfs_sram_offset = 0x800000;