Hi Timur,

On 27 February 2016 at 03:27, Timur Tabi [off-list ref] wrote:

fu.wei-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org wrote:

quoted

+       if (action) {
+               irq = platform_get_irq(pdev, 0);
+               if (irq < 0) {
+                       action = 0;
+                       dev_warn(dev, "unable to get ws0 interrupt.\n");
+               } else {
+                       if (devm_request_irq(dev, irq,
sbsa_gwdt_interrupt, 0,
+                                            pdev->name, gwdt)) {
+                               action = 0;
+                               dev_warn(dev, "unable to request IRQ
%d.\n",
+                                        irq);
+                       }
+               }
+               if (!action)
+                       dev_warn(dev, "falling back to signle stage
mode.\n");
+       }
+
+       /*
+        * Get the frequency of system counter from the cp15 interface of
ARM
+        * Generic timer. We don't need to check it, because if it returns
"0",
+        * system would panic in very early stage.
+        */
+       gwdt->clk = arch_timer_get_cntfrq();
+       gwdt->refresh_base = rf_base;
+       gwdt->control_base = cf_base;

I think you need to ping the watchdog before enabling the interrupt, in case
there is a pending interrupt.  This just happened to me in testing, so I
recommend this:

quoted

        /*
         * Get the frequency of system counter from the cp15 interface of
ARM
         * Generic timer. We don't need to check it, because if it returns
"0",
         * system would panic in very early stage.
         */
        gwdt->clk = arch_timer_get_cntfrq();
        gwdt->refresh_base = rf_base;
        gwdt->control_base = cf_base;

        if (action) {
                irq = platform_get_irq(pdev, 0);
                if (irq < 0) {
                        action = 0;
                        dev_warn(dev, "unable to get ws0 interrupt.\n");
                } else {
                        sbsa_gwdt_keepalive(&gwdt->wdd);
                        if (devm_request_irq(dev, irq,
sbsa_gwdt_interrupt, 0,
                                             pdev->name, gwdt)) {
                                action = 0;
                                dev_warn(dev, "unable to request IRQ
%d.\n",
                                         irq);
                        }
                }
                if (!action)
                        dev_warn(dev, "falling back to single stage
mode.\n");
        }

In fact, I think you need to move the "if (action) {" block near the end of
sbsa_gwdt_probe().  We don't want to enable the interrupt until the watchdog
is fully initialized.

Good point! Thanks for your testing :-)

Will post v14 for this change.

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-- 
Best regards,

Fu Wei
Software Engineer
Red Hat Software (Beijing) Co.,Ltd.Shanghai Branch
Ph: +86 21 61221326(direct)
Ph: +86 186 2020 4684 (mobile)
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