#ifndef LINK_H #define LINK_H #include #include #include #include #include "built_in.h" extern int wireless_sigqual(const char *ifname, struct iw_statistics *stats); extern int wireless_rangemax_sigqual(const char *ifname); extern u32 wireless_bitrate(const char *ifname); extern u32 ethtool_bitrate(const char *ifname); extern int ethtool_drvinf(const char *ifname, struct ethtool_drvinfo *drvinf); extern int ethtool_link(const char *ifname); #endif /* LINK_H */ k rel='vcs-git' href='http:///git.distanz.ch/cgit.cgi/linux/net-next.git' title='net-next.git Git repository'/>
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authorVaibhav Hiremath <hiremath_vaibhav@projectara.com>2016-08-03 17:15:38 +0530
committerGreg Kroah-Hartman <gregkh@google.com>2016-08-03 15:43:51 +0200
commit8ef0b5383110977d81746cd0b09c3877d51c3a67 (patch)
treee401faaa6f7119157efc52da52ffb2eb0a59d09d /drivers
parent60793c9be9a140e2102a0f64a38d34e9b28a1357 (diff)
greybus: arche-platform: Reset SVC & APB only if turned off by SUSPEND_PREPARE
There is possible race condition in arche platform driver for maintaining of ->state field, when shared with timesync driver. Assume device booted fine, all connected modules have been enumerated correctly. As part of suspend-resume operation we have pm_notifier callback, where we turn off SVC & APB and coldboot on resume. In the process of resume, all modules gets enumerated again, and timesync driver does come into picture everytime. So when timesync driver requests arche-platform to change the state to TIMESYNC and in the middle of sync operation, if suspend gets triggered, then execution lands into arche-platform->pm_notifier callback, leading to race condition in the driver, where it checks for (state != ACTIVE) in PM_SUSPEND_PREPARE and returns, but in PM_POST_SUSPEND it just simply coldboots SVC & APB, which would inbalance all resources (including IRQ). So we need a add check in PM_POST_SUSPEND, to make sure that, we only coldboot devices if they are in to off state, i.e. if (state != OFF) then return. Testing Done: Done regressive suspend/resume testing on EVT2 platform. Note that, I some time hit issue. Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Diffstat (limited to 'drivers')