From: Ido Yariv <ido@wizery.com>
Date: Tue, 21 Aug 2012 14:17:13 +0000 (+0300)
Subject: wlcore: Allow memory access when the FW crashes
X-Git-Tag: next-20121001~67^2~38^2~4
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d556023895c8968fd97ccb08300006b78975a23b;p=karo-tx-linux.git

wlcore: Allow memory access when the FW crashes

When the no_recovery flag is used, the recovery work will not restart
the FW and the state will not be set to 'on'. To enable post-mortem
analysis, allow memory access in the 'restarting' state.

Also, since the FW might not be operational, don't fail the read/write
operations if elp_wakeup fails.

Reported-by: Arkady Miasnikov <a-miasnikov@ti.com>
Signed-off-by: Ido Yariv <ido@wizery.com>
Signed-off-by: Luciano Coelho <luca@coelho.fi>
---

diff --git a/drivers/net/wireless/ti/wlcore/debugfs.c b/drivers/net/wireless/ti/wlcore/debugfs.c
index 3d39784d639b..c86bb00c2488 100644
--- a/drivers/net/wireless/ti/wlcore/debugfs.c
+++ b/drivers/net/wireless/ti/wlcore/debugfs.c
@@ -1064,14 +1064,16 @@ static ssize_t dev_mem_read(struct file *file,
 
 	mutex_lock(&wl->mutex);
 
-	if (unlikely(wl->state != WLCORE_STATE_ON)) {
+	if (unlikely(wl->state == WLCORE_STATE_OFF)) {
 		ret = -EFAULT;
 		goto skip_read;
 	}
 
-	ret = wl1271_ps_elp_wakeup(wl);
-	if (ret < 0)
-		goto skip_read;
+	/*
+	 * Don't fail if elp_wakeup returns an error, so the device's memory
+	 * could be read even if the FW crashed
+	 */
+	wl1271_ps_elp_wakeup(wl);
 
 	/* store current partition and switch partition */
 	memcpy(&old_part, &wl->curr_part, sizeof(old_part));
@@ -1149,14 +1151,16 @@ static ssize_t dev_mem_write(struct file *file, const char __user *user_buf,
 
 	mutex_lock(&wl->mutex);
 
-	if (unlikely(wl->state != WLCORE_STATE_ON)) {
+	if (unlikely(wl->state == WLCORE_STATE_OFF)) {
 		ret = -EFAULT;
 		goto skip_write;
 	}
 
-	ret = wl1271_ps_elp_wakeup(wl);
-	if (ret < 0)
-		goto skip_write;
+	/*
+	 * Don't fail if elp_wakeup returns an error, so the device's memory
+	 * could be read even if the FW crashed
+	 */
+	wl1271_ps_elp_wakeup(wl);
 
 	/* store current partition and switch partition */
 	memcpy(&old_part, &wl->curr_part, sizeof(old_part));