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Revert "wlcore: Add missing PM call for wlcore_cmd_wait_for_event_or_timeout()"

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This reverts commit 3fdd34643f which was
upstream commit 4ec7cece87b3ed21ffcd407c62fb2f151a366bc1.

From Dietmar May's report on the stable mailing list
(https://www.spinics.net/lists/stable/msg272201.html):

> I've run into some problems which appear due to (a) recent patch(es) on
> the wlcore wifi driver.
>
> 4.4.160 - commit 3fdd34643f
> 4.9.131 - commit afeeecc764436f31d4447575bb9007732333818c
>
> Earlier versions (4.9.130 and 4.4.159 - tested back to 4.4.49) do not
> exhibit this problem. It is still present in 4.9.141.
>
> master as of 4.20.0-rc4 does not exhibit this problem.
>
> Basically, during client association when in AP mode (running hostapd),
> handshake may or may not complete following a noticeable delay. If
> successful, then the driver fails consistently in warn_slowpath_null
> during disassociation. If unsuccessful, the wifi client attempts multiple
> times, sometimes failing repeatedly. I've had clients unable to connect
> for 3-5 minutes during testing, with the syslog filled with dozens of
> backtraces. syslog details are below.
>
> I'm working on an embedded device with a TI 3352 ARM processor and a
> murata wl1271 module in sdio mode. We're running a fully patched ubuntu
> 18.04 ARM build, with a kernel built from kernel.org's stable/linux repo <https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-4.9.y&id=afeeecc764436f31d4447575bb9007732333818c>.
> Relevant parts of the kernel config are included below.
>
> The commit message states:
>
> > /I've only seen this few times with the runtime PM patches enabled so
> > this one is probably not needed before that. This seems to work
> > currently based on the current PM implementation timer. Let's apply
> > this separately though in case others are hitting this issue./
> We're not doing anything explicit with power management. The device is an
> IoT edge gateway with battery backup, normally running on wall power. The
> battery is currently used solely to shut down the system cleanly to avoid
> filesystem corruption.
>
> The device tree is configured to keep power in suspend; but the device
> should never suspend, so in our case, there is no need to call
> wl1271_ps_elp_wakeup() or wl1271_ps_elp_sleep(), as occurs in the patch.

Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sasha Levin 2018-12-02 10:03:24 -05:00 • committed by Greg Kroah-Hartman
parent 4de120cba4
commit 494fedded2
1 changed files with 0 additions and 6 deletions
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6
drivers/net/wireless/ti/wlcore/cmd.c
View file

@ -35,7 +35,6 @@
#include "wl12xx_80211.h"
#include "cmd.h"
#include "event.h"
#include "ps.h"
#include "tx.h"
#include "hw_ops.h"
@ -192,10 +191,6 @@ int wlcore_cmd_wait_for_event_or_timeout(struct wl1271 *wl,
timeout_time = jiffies + msecs_to_jiffies(WL1271_EVENT_TIMEOUT);
ret = wl1271_ps_elp_wakeup(wl);
if (ret < 0)
return ret;
do {
if (time_after(jiffies, timeout_time)) {
wl1271_debug(DEBUG_CMD, "timeout waiting for event %d",
@ -227,7 +222,6 @@ int wlcore_cmd_wait_for_event_or_timeout(struct wl1271 *wl,
} while (!event);
out:
wl1271_ps_elp_sleep(wl);
kfree(events_vector);
return ret;
}