From d556023895c8968fd97ccb08300006b78975a23b Mon Sep 17 00:00:00 2001 From: Ido Yariv Date: Tue, 21 Aug 2012 17:17:13 +0300 Subject: [PATCH] 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 Signed-off-by: Ido Yariv Signed-off-by: Luciano Coelho --- drivers/net/wireless/ti/wlcore/debugfs.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) 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)); -- 2.20.1