diff options
| author | Tomas Winkler <tomas.winkler@intel.com> | 2014-03-03 00:21:28 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-17 15:49:41 -0700 |
| commit | b1b94b5d387e3a1f034c308e22f9295828d7174a (patch) | |
| tree | 131a47df93abde60908304e8dd57983651b0c7cf /drivers/misc/mei/hw-me.c | |
| parent | 07792c7e102110b9e7243c5c6aca891041272b67 (diff) | |
mei: me: do not reset when less than expected data is received
There is a race in ME hardware between data copy for host and interrupt
delivery. An interrupt can be delivered prior to whole data copied for the
host to read but rather then going trough the reset we just merely need to
wait for the next interrupt.
The bug is visible in read/write stress with multiple connections per client
This is a regression caused as a side effect of the commit:
commit 544f94601409653f07ae6e22d4a39e3a90dceead
mei: do not run reset flow from the interrupt thread
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Cc: stable <stable@vger.kernel.org> # 3.14
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/hw-me.c')
| -rw-r--r-- | drivers/misc/mei/hw-me.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c index 7e769c59a42..7145929cdb5 100644 --- a/drivers/misc/mei/hw-me.c +++ b/drivers/misc/mei/hw-me.c @@ -507,7 +507,16 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id) while (slots > 0) { dev_dbg(&dev->pdev->dev, "slots to read = %08x\n", slots); rets = mei_irq_read_handler(dev, &complete_list, &slots); + /* There is a race between ME write and interrupt delivery: + * Not all data is always available immediately after the + * interrupt, so try to read again on the next interrupt. + */ + if (rets == -ENODATA) + break; + if (rets && dev->dev_state != MEI_DEV_RESETTING) { + dev_err(&dev->pdev->dev, "mei_irq_read_handler ret = %d.\n", + rets); schedule_work(&dev->reset_work); goto end; } |